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Please Help! Why Window Size of one receiver (company B) retain same?

Hi Guru,

We are experiencing email delay issue to company B only and we are fine with sending to other companies. After invesigation, we realized when we do SMTP transission, window size of company always has same number and never increased. And then we got TCP Window is Full message and their window size increase after 5-6 time re-try. We did packet capture when we sent emails to both company A and company B. Below are two packet capture files (not delayed one since the packet capture with delay issue is too big to post here.) Packet capture file for company A is good. You can see window size keeps increased automatically ( for example: at frame 20 Win=8704; at frame 23, win=11264...) Packet capture file for company B is NOT good. ( for example: at frame 21 Win=15048; at frame 24, win=15048; at frame 27, win=15048, etc... )

So what would be the issue with company B? Or something from our end?

Thanks in Advance!

--------Packet capture of email to Company A --

No. Time Source Destination Protocol Length Info

  1 0.000000    192.168.25.53         aa.aa.aa.aa         TCP      76     45330 > smtp [SYN] Seq=0 Win=5840 Len=0 MSS=1460 SACK_PERM=1 TSval=384128265 TSecr=0 WS=128

Frame 1: 76 bytes on wire (608 bits), 76 bytes captured (608 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 0, Len: 0

No. Time Source Destination Protocol Length Info 2 0.028513 aa.aa.aa.aa 192.168.25.53 TCP 76 smtp > 45330 [SYN, ACK] Seq=0 Ack=1 Win=5792 Len=0 MSS=1380 SACK_PERM=1 TSval=3586963129 TSecr=384128265 WS=512

Frame 2: 76 bytes on wire (608 bits), 76 bytes captured (608 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 0, Ack: 1, Len: 0

No. Time Source Destination Protocol Length Info 3 0.028544 192.168.25.53 aa.aa.aa.aa TCP 68 45330 > smtp [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSval=384128293 TSecr=3586963129

Frame 3: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 1, Ack: 1, Len: 0

No. Time Source Destination Protocol Length Info 4 0.058350 aa.aa.aa.aa 192.168.25.53 SMTP 193 S: 220 IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted service ready; Fri, 5 Oct 2012 13:56:28 -0400

Frame 4: 193 bytes on wire (1544 bits), 193 bytes captured (1544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 1, Ack: 1, Len: 125 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 5 0.058377 192.168.25.53 aa.aa.aa.aa TCP 68 45330 > smtp [ACK] Seq=1 Ack=126 Win=5888 Len=0 TSval=384128323 TSecr=3586963136

Frame 5: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 1, Ack: 126, Len: 0

No. Time Source Destination Protocol Length Info 6 0.058434 192.168.25.53 aa.aa.aa.aa SMTP 86 C: EHLO mail.bbm.ca

Frame 6: 86 bytes on wire (688 bits), 86 bytes captured (688 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 1, Ack: 126, Len: 18 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 7 0.086861 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=126 Ack=19 Win=6144 Len=0 TSval=3586963143 TSecr=384128323

Frame 7: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 126, Ack: 19, Len: 0

Frame 8: 204 bytes on wire (1632 bits), 204 bytes captured (1632 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 126, Ack: 19, Len: 136 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 9 0.286699 192.168.25.53 aa.aa.aa.aa SMTP 103 C: MAIL FROM:[email protected] SIZE=8722

Frame 9: 103 bytes on wire (824 bits), 103 bytes captured (824 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 19, Ack: 262, Len: 35 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 10 0.314382 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=262 Ack=54 Win=6144 Len=0 TSval=3586963200 TSecr=384128552

Frame 10: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 262, Ack: 54, Len: 0

No. Time Source Destination Protocol Length Info 11 0.524892 aa.aa.aa.aa 192.168.25.53 SMTP 76 S: 250 OK

Frame 11: 76 bytes on wire (608 bits), 76 bytes captured (608 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 262, Ack: 54, Len: 8 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 12 0.524953 192.168.25.53 aa.aa.aa.aa SMTP 99 C: RCPT TO:[email protected]

Frame 12: 99 bytes on wire (792 bits), 99 bytes captured (792 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 54, Ack: 270, Len: 31 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 13 0.552584 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=270 Ack=85 Win=6144 Len=0 TSval=3586963260 TSecr=384128790

Frame 13: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 270, Ack: 85, Len: 0

No. Time Source Destination Protocol Length Info 14 0.767227 aa.aa.aa.aa 192.168.25.53 SMTP 76 S: 250 OK

Frame 14: 76 bytes on wire (608 bits), 76 bytes captured (608 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 270, Ack: 85, Len: 8 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 15 0.767321 192.168.25.53 aa.aa.aa.aa SMTP 74 C: DATA

Frame 15: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 85, Ack: 278, Len: 6 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 16 0.794869 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=278 Ack=91 Win=6144 Len=0 TSval=3586963320 TSecr=384129032

Frame 16: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 278, Ack: 91, Len: 0

No. Time Source Destination Protocol Length Info 17 0.994113 aa.aa.aa.aa 192.168.25.53 SMTP 114 S: 354 Start mail input; end with <crlf>.<crlf>

Frame 17: 114 bytes on wire (912 bits), 114 bytes captured (912 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 278, Ack: 91, Len: 46 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 18 0.994178 192.168.25.53 aa.aa.aa.aa SMTP 1436 C: DATA fragment, 1368 bytes

Frame 18: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 91, Ack: 324, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 19 0.994226 192.168.25.53 aa.aa.aa.aa SMTP 1436 C: DATA fragment, 1368 bytes

Frame 19: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 1459, Ack: 324, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 20 1.023579 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=324 Ack=1459 Win=8704 Len=0 TSval=3586963378 TSecr=384129259

Frame 20: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 324, Ack: 1459, Len: 0

No. Time Source Destination Protocol Length Info 21 1.023603 192.168.25.53 aa.aa.aa.aa SMTP 1436 C: DATA fragment, 1368 bytes

Frame 21: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 2827, Ack: 324, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 22 1.023639 192.168.25.53 aa.aa.aa.aa SMTP 1436 C: DATA fragment, 1368 bytes

Frame 22: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 4195, Ack: 324, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 23 1.023582 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=324 Ack=2827 Win=11264 Len=0 TSval=3586963378 TSecr=384129259

Frame 23: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 324, Ack: 2827, Len: 0

No. Time Source Destination Protocol Length Info 24 1.023673 192.168.25.53 aa.aa.aa.aa SMTP 1436 C: DATA fragment, 1368 bytes

Frame 24: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 5563, Ack: 324, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 25 1.023699 192.168.25.53 aa.aa.aa.aa SMTP 1436 C: DATA fragment, 1368 bytes

Frame 25: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 6931, Ack: 324, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 26 1.053180 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=324 Ack=4195 Win=14336 Len=0 TSval=3586963385 TSecr=384129289

Frame 26: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 324, Ack: 4195, Len: 0

No. Time Source Destination Protocol Length Info 27 1.053200 192.168.25.53 aa.aa.aa.aa IMF 582 from: Wilson Liu [email protected], subject: Email test # 1 at 13:56 on Oct. 5, 2012 no attachment,

Frame 27: 582 bytes on wire (4656 bits), 582 bytes captured (4656 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 8299, Ack: 324, Len: 514 Simple Mail Transfer Protocol Internet Message Format

No. Time Source Destination Protocol Length Info 28 1.053418 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=324 Ack=5563 Win=16896 Len=0 TSval=3586963385 TSecr=384129289

Frame 28: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 324, Ack: 5563, Len: 0

No. Time Source Destination Protocol Length Info 29 1.053420 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=324 Ack=6931 Win=19968 Len=0 TSval=3586963385 TSecr=384129289

Frame 29: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 324, Ack: 6931, Len: 0

No. Time Source Destination Protocol Length Info 30 1.053428 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=324 Ack=8299 Win=22528 Len=0 TSval=3586963385 TSecr=384129289

Frame 30: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 324, Ack: 8299, Len: 0

No. Time Source Destination Protocol Length Info 31 1.081292 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=324 Ack=8813 Win=25088 Len=0 TSval=3586963392 TSecr=384129318

Frame 31: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 324, Ack: 8813, Len: 0

No. Time Source Destination Protocol Length Info 32 1.090671 aa.aa.aa.aa 192.168.25.53 SMTP 115 S: 250 OK <12100517-3534-0000-0000-00000D7C38D1>

Frame 32: 115 bytes on wire (920 bits), 115 bytes captured (920 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 324, Ack: 8813, Len: 47 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 33 1.091117 192.168.25.53 aa.aa.aa.aa SMTP 74 C: QUIT

Frame 33: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 8813, Ack: 371, Len: 6 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 34 1.091167 192.168.25.53 aa.aa.aa.aa TCP 68 45330 > smtp [FIN, ACK] Seq=8819 Ack=371 Win=5760 Len=0 TSval=384129356 TSecr=3586963394

Frame 34: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 8819, Ack: 371, Len: 0

No. Time Source Destination Protocol Length Info 35 1.156962 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [ACK] Seq=371 Ack=8820 Win=25088 Len=0 TSval=3586963411 TSecr=384129356

Frame 35: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 371, Ack: 8820, Len: 0

No. Time Source Destination Protocol Length Info 36 1.316973 aa.aa.aa.aa 192.168.25.53 SMTP 184 S: 221 IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted service closing transmission channel

Frame 36: 184 bytes on wire (1472 bits), 184 bytes captured (1472 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 371, Ack: 8820, Len: 116 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 37 1.316997 192.168.25.53 aa.aa.aa.aa TCP 56 45330 > smtp [RST] Seq=8820 Win=0 Len=0

Frame 37: 56 bytes on wire (448 bits), 56 bytes captured (448 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 8820, Len: 0

No. Time Source Destination Protocol Length Info 38 1.316975 aa.aa.aa.aa 192.168.25.53 TCP 68 smtp > 45330 [FIN, ACK] Seq=487 Ack=8820 Win=25088 Len=0 TSval=3586963451 TSecr=384129356

Frame 38: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: aa.aa.aa.aa (aa.aa.aa.aa), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 45330 (45330), Seq: 487, Ack: 8820, Len: 0

No. Time Source Destination Protocol Length Info 39 1.317036 192.168.25.53 aa.aa.aa.aa TCP 56 45330 > smtp [RST] Seq=8820 Win=0 Len=0

Frame 39: 56 bytes on wire (448 bits), 56 bytes captured (448 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: aa.aa.aa.aa (aa.aa.aa.aa) Transmission Control Protocol, Src Port: 45330 (45330), Dst Port: smtp (25), Seq: 8820, Len: 0

===============Packet capture of email to Company B ====

No. Time Source Destination Protocol Length Info 1 0.000000 192.168.25.53 bb.bb.bb.bb TCP 76 56506 > smtp [SYN] Seq=0 Win=5840 Len=0 MSS=1460 SACK_PERM=1 TSval=384128245 TSecr=0 WS=128

Frame 1: 76 bytes on wire (608 bits), 76 bytes captured (608 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 0, Len: 0

No. Time Source Destination Protocol Length Info 2 0.004381 bb.bb.bb.bb 192.168.25.53 TCP 76 smtp > 56506 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1380 WS=8 SACK_PERM=1 TSval=1163590919 TSecr=384128245

Frame 2: 76 bytes on wire (608 bits), 76 bytes captured (608 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 0, Ack: 1, Len: 0

No. Time Source Destination Protocol Length Info 3 0.004413 192.168.25.53 bb.bb.bb.bb TCP 68 56506 > smtp [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSval=384128249 TSecr=1163590919

Frame 3: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 1, Ack: 1, Len: 0

No. Time Source Destination Protocol Length Info 4 0.011866 bb.bb.bb.bb 192.168.25.53 SMTP 104 S: 220 mail.mail.rss.rogers.com ESMTP

Frame 4: 104 bytes on wire (832 bits), 104 bytes captured (832 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 1, Ack: 1, Len: 36 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 5 0.011904 192.168.25.53 bb.bb.bb.bb TCP 68 56506 > smtp [ACK] Seq=1 Ack=37 Win=5888 Len=0 TSval=384128257 TSecr=1163590920

Frame 5: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 1, Ack: 37, Len: 0

No. Time Source Destination Protocol Length Info 6 0.011949 192.168.25.53 bb.bb.bb.bb SMTP 86 C: EHLO mail.bbm.ca

Frame 6: 86 bytes on wire (688 bits), 86 bytes captured (688 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 1, Ack: 37, Len: 18 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 7 0.015349 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=37 Ack=19 Win=16392 Len=0 TSval=1163590920 TSecr=384128257

Frame 7: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 37, Ack: 19, Len: 0

No. Time Source Destination Protocol Length Info 8 0.017542 bb.bb.bb.bb 192.168.25.53 SMTP 145 S: 250-mail.mail.rss.rogers.com | 250-8BITMIME | 250-SIZE 15728640 | 250 STARTTLS

Frame 8: 145 bytes on wire (1160 bits), 145 bytes captured (1160 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 37, Ack: 19, Len: 77 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 9 0.017650 192.168.25.53 bb.bb.bb.bb SMTP 103 C: MAIL FROM:[email protected] SIZE=8722

Frame 9: 103 bytes on wire (824 bits), 103 bytes captured (824 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 19, Ack: 114, Len: 35 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 10 0.021137 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=114 Ack=54 Win=16376 Len=0 TSval=1163590920 TSecr=384128262

Frame 10: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 114, Ack: 54, Len: 0

No. Time Source Destination Protocol Length Info 11 0.022558 bb.bb.bb.bb 192.168.25.53 SMTP 97 S: 250 sender [email protected] ok

Frame 11: 97 bytes on wire (776 bits), 97 bytes captured (776 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 114, Ack: 54, Len: 29 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 12 0.022619 192.168.25.53 bb.bb.bb.bb SMTP 107 C: RCPT TO:[email protected]

Frame 12: 107 bytes on wire (856 bits), 107 bytes captured (856 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 54, Ack: 143, Len: 39 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 13 0.026501 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=143 Ack=93 Win=16376 Len=0 TSval=1163590921 TSecr=384128267

Frame 13: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 143, Ack: 93, Len: 0

No. Time Source Destination Protocol Length Info 14 0.027085 bb.bb.bb.bb 192.168.25.53 SMTP 116 S: 250 recipient [email protected] ok

Frame 14: 116 bytes on wire (928 bits), 116 bytes captured (928 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 143, Ack: 93, Len: 48 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 15 0.027141 192.168.25.53 bb.bb.bb.bb SMTP 74 C: DATA

Frame 15: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 93, Ack: 191, Len: 6 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 16 0.030686 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=191 Ack=99 Win=16408 Len=0 TSval=1163590921 TSecr=384128272

Frame 16: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 191, Ack: 99, Len: 0

No. Time Source Destination Protocol Length Info 17 0.030688 bb.bb.bb.bb 192.168.25.53 SMTP 82 S: 354 go ahead

Frame 17: 82 bytes on wire (656 bits), 82 bytes captured (656 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 191, Ack: 99, Len: 14 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 18 0.030742 192.168.25.53 bb.bb.bb.bb SMTP 1436 C: DATA fragment, 1368 bytes

Frame 18: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 99, Ack: 205, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 19 0.030787 192.168.25.53 bb.bb.bb.bb SMTP 1436 C: DATA fragment, 1368 bytes

Frame 19: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 1467, Ack: 205, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 20 0.030840 192.168.25.53 bb.bb.bb.bb SMTP 1436 C: DATA fragment, 1368 bytes

Frame 20: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 2835, Ack: 205, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 21 0.035638 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=205 Ack=1467 Win=15048 Len=0 TSval=1163590922 TSecr=384128275

Frame 21: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 205, Ack: 1467, Len: 0

No. Time Source Destination Protocol Length Info 22 0.035659 192.168.25.53 bb.bb.bb.bb SMTP 1436 C: DATA fragment, 1368 bytes

Frame 22: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 4203, Ack: 205, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 23 0.035693 192.168.25.53 bb.bb.bb.bb SMTP 1436 C: DATA fragment, 1368 bytes

Frame 23: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 5571, Ack: 205, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 24 0.035640 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=205 Ack=2835 Win=15048 Len=0 TSval=1163590922 TSecr=384128275

Frame 24: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 205, Ack: 2835, Len: 0

No. Time Source Destination Protocol Length Info 25 0.035734 192.168.25.53 bb.bb.bb.bb SMTP 1436 C: DATA fragment, 1368 bytes

Frame 25: 1436 bytes on wire (11488 bits), 1436 bytes captured (11488 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 6939, Ack: 205, Len: 1368 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 26 0.035762 192.168.25.53 bb.bb.bb.bb IMF 582 from: Wilson Liu [email protected], subject: Email test # 1 at 13:56 on Oct. 5, 2012 no attachment,

Frame 26: 582 bytes on wire (4656 bits), 582 bytes captured (4656 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 8307, Ack: 205, Len: 514 Simple Mail Transfer Protocol Internet Message Format

No. Time Source Destination Protocol Length Info 27 0.036159 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=205 Ack=4203 Win=15048 Len=0 TSval=1163590922 TSecr=384128275

Frame 27: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 205, Ack: 4203, Len: 0

No. Time Source Destination Protocol Length Info 28 0.040250 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=205 Ack=5571 Win=15048 Len=0 TSval=1163590922 TSecr=384128280

Frame 28: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 205, Ack: 5571, Len: 0

No. Time Source Destination Protocol Length Info 29 0.040258 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=205 Ack=6939 Win=15048 Len=0 TSval=1163590922 TSecr=384128280

Frame 29: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 205, Ack: 6939, Len: 0

No. Time Source Destination Protocol Length Info 30 0.040259 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=205 Ack=8307 Win=15048 Len=0 TSval=1163590922 TSecr=384128280

Frame 30: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 205, Ack: 8307, Len: 0

No. Time Source Destination Protocol Length Info 31 0.040282 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=205 Ack=8821 Win=14528 Len=0 TSval=1163590922 TSecr=384128280

Frame 31: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 205, Ack: 8821, Len: 0

No. Time Source Destination Protocol Length Info 32 0.044383 bb.bb.bb.bb 192.168.25.53 SMTP 105 S: 250 ok: Message 289870036 accepted

Frame 32: 105 bytes on wire (840 bits), 105 bytes captured (840 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 205, Ack: 8821, Len: 37 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 33 0.044822 192.168.25.53 bb.bb.bb.bb SMTP 74 C: QUIT

Frame 33: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 8821, Ack: 242, Len: 6 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 34 0.044889 192.168.25.53 bb.bb.bb.bb TCP 68 56506 > smtp [FIN, ACK] Seq=8827 Ack=242 Win=5888 Len=0 TSval=384128290 TSecr=1163590923

Frame 34: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 8827, Ack: 242, Len: 0

No. Time Source Destination Protocol Length Info 35 0.048778 bb.bb.bb.bb 192.168.25.53 TCP 68 [TCP Dup ACK 32#1] smtp > 56506 [ACK] Seq=242 Ack=8821 Win=16416 Len=0 TSval=1163590923 TSecr=384128280

Frame 35: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 242, Ack: 8821, Len: 0

No. Time Source Destination Protocol Length Info 36 0.048803 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [ACK] Seq=242 Ack=8828 Win=16408 Len=0 TSval=1163590923 TSecr=384128289

Frame 36: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 242, Ack: 8828, Len: 0

No. Time Source Destination Protocol Length Info 37 0.048841 bb.bb.bb.bb 192.168.25.53 SMTP 98 S: 221 mail.mail.rss.rogers.com

Frame 37: 98 bytes on wire (784 bits), 98 bytes captured (784 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 242, Ack: 8828, Len: 30 Simple Mail Transfer Protocol

No. Time Source Destination Protocol Length Info 38 0.048894 192.168.25.53 bb.bb.bb.bb TCP 56 56506 > smtp [RST] Seq=8828 Win=0 Len=0

Frame 38: 56 bytes on wire (448 bits), 56 bytes captured (448 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 8828, Len: 0

No. Time Source Destination Protocol Length Info 39 0.048843 bb.bb.bb.bb 192.168.25.53 TCP 68 smtp > 56506 [FIN, ACK] Seq=272 Ack=8828 Win=16416 Len=0 TSval=1163590923 TSecr=384128289

Frame 39: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) Linux cooked capture Internet Protocol Version 4, Src: bb.bb.bb.bb (bb.bb.bb.bb), Dst: 192.168.25.53 (192.168.25.53) Transmission Control Protocol, Src Port: smtp (25), Dst Port: 56506 (56506), Seq: 272, Ack: 8828, Len: 0

No. Time Source Destination Protocol Length Info 40 0.048930 192.168.25.53 bb.bb.bb.bb TCP 56 56506 > smtp [RST] Seq=8828 Win=0 Len=0

Frame 40: 56 bytes on wire (448 bits), 56 bytes captured (448 bits) Linux cooked capture Internet Protocol Version 4, Src: 192.168.25.53 (192.168.25.53), Dst: bb.bb.bb.bb (bb.bb.bb.bb) Transmission Control Protocol, Src Port: 56506 (56506), Dst Port: smtp (25), Seq: 8828, Len: 0

window size

asked 09 Oct '12, 20:41

wilsonliu
1●1●1●1
accept rate: 0%

Couldn't find any hints from your trace. Do you have Window scaling on?

-Rakki

(10 Oct '12, 03:47) rakki