Hi, I am running CentOS 6.2 using the default e1000 driver for my Intel Pro/1000 CT Gb NIC card. I am running Dumpcap to capture packets from this interface. I am seeing NO packets being captured. I looked at this site: http://wiki.wireshark.org/CaptureSetup/VLAN I was unable to determine a resolution for issue. Any guidance or assistance will be greatly appreciated. Thanks, John asked 30 Oct '12, 12:06  xq1 edited 30 Oct '12, 12:44  Kurt Knochner ♦ |
2 Answers:
Problem Solved - added MTU="9000" to /etc/sysconfig/network-scripts/ifcfg-ethx Thanks Kurt for your time! answered 31 Oct '12, 11:55 xq1 |
There are discussions on the internet about the e1000 driver and VLAN handling. Taking these into account, I have some questions and some suggestions: Questions:
Suggestions:
Regards answered 30 Oct '12, 12:38 Kurt Knochner ♦ Hi Kurt, Below are the answers to your questions. Any guidance to troubleshooting and resolving is greatly appreciated. -John ======================= None of my interfaces are set up with VLAN subinterfaces (ie eth1.100) ======================= tcpdump -ni eth1 vlan - produces no output ======================= tcpdump -ni eth1 vlantcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes ======================= modinfo -d -p e1000 output ======================= modinfo -d -p e1000debug:Debug level (0=none,...,16=all) copybreak:Maximum size of packet that is copied to a new buffer on receive KumeranLockLoss:Enable Kumeran lock loss workaround SmartPowerDownEnable:Enable PHY smart power down InterruptThrottleRate:Interrupt Throttling Rate RxAbsIntDelay:Receive Absolute Interrupt Delay RxIntDelay:Receive Interrupt Delay TxAbsIntDelay:Transmit Absolute Interrupt Delay TxIntDelay:Transmit Interrupt Delay XsumRX:Disable or enable Receive Checksum offload FlowControl:Flow Control setting AutoNeg:Advertised auto-negotiation setting Duplex:Duplex setting Speed:Speed setting RxDescriptors:Number of receive descriptors TxDescriptors:Number of transmit descriptors (30 Oct '12, 16:03) xq1 ethtool -i eth1driver: e1000e version: 1.9.5-k firmware-version: 1.8-0 bus-info: 0000:20:00.0 (30 Oct '12, 16:05) xq1 I noticed the driver loaded for this NIC is actually e1000e so here is the output for e1000e: modinfo -d -p e1000eEEE:Enable/disable on parts that support the feature CrcStripping:Enable CRC Stripping, disable if your BMC needs the CRC WriteProtectNVM:Write-protect NVM [WARNING: disabling this can lead to corrupted NVM] KumeranLockLoss:Enable Kumeran lock loss workaround SmartPowerDownEnable:Enable PHY smart power down IntMode:Interrupt Mode InterruptThrottleRate:Interrupt Throttling Rate RxAbsIntDelay:Receive Absolute Interrupt Delay RxIntDelay:Receive Interrupt Delay TxAbsIntDelay:Transmit Absolute Interrupt Delay TxIntDelay:Transmit Interrupt Delay copybreak:Maximum size of packet that is copied to a new buffer on receive (30 Oct '12, 16:07) xq1 lspci output: 20:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection 30:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection (30 Oct '12, 16:10) xq1 |
As it turns out this solution does NOT make the change permanent.