https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3112
--- Comment #21 from Sake <sake@xxxxxxxxxx> 2009-01-05 11:14:50 PDT ---
If I run "Captured packets from a 2950 switch" against my Cisco 2950 (running
12.1(22)EA9), all packets are accepted and I see 5 new neighbors:
c2950#sh cdp nei
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
aa.foxpaws.net Fas 0/22 178 S I WS-C2950T-Fas 0/1
switchfox.foxpaws.net
Fas 0/22 176 S I WS-C2950T-Fas 0/1
a.foxpaws.net Fas 0/22 177 S I WS-C2950T-Fas 0/1
abc.foxpaws.net Fas 0/22 179 S I WS-C2950T-Fas 0/1
c2950#
When I change the checksum of the CDP packet for a.foxpaws.net to a bogus value
and the checksum of the CDP packet for aa.foxpaws.net to 0x9ad1 (as wireshark
currently thinks it should be) I only see 3:
c2950#sh cdp nei
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
abcd.foxpaws.net Fas 0/22 177 S I WS-C2950T-Fas 0/1
switchfox.foxpaws.net
Fas 0/22 178 S I WS-C2950T-Fas 0/1
abc.foxpaws.net Fas 0/22 176 S I WS-C2950T-Fas 0/1
c2950#
Which means that a) the checksums are indeed checked and b) that my ios
software thinks all the original checksums are indeed correct and the wireshark
checksum is not correct.
Hope this helps...
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