for some traces DHCP discovery packets, DHCP option 60 VCI value is EMPTY but in hex area we can see values in Bytes and HEX ... with length 7
Why VCI area is shown empty???
Option 60 length 7 Vendor Class identifier= "empty"
in bytes option code = 3c length = 07 value = 00 00 22 03 48 47 57
asked 05 Mar '15, 05:20
Maybe because the actual value begins with zeroes, which could indicate a string terminator - so the Wireshark dissector probably thinks that the string is finished at the first byte. I'm just guessing though.
answered 05 Mar '15, 05:49
RFC 2132 just says the value is a "string of n octets"; it doesn't say "character string", as it does for some other options. The Wireshark dissector currently treats it as a character string; you might need to check with the supplier of whatever hardware/software is sending that packet to find out how that field is to be interpreted.
answered 05 Mar '15, 17:48
Guy Harris ♦♦