debug icmp trace message question

[jmcgarry]

What do the following messages indicate, and where can I find info. that will educate me on same?

Warning: this may cause problems on busy networks

RBXFW01# 169231: ICMP type 104 (code 47) 172.26.216.2 > 172.26.216.8 packet ignored

169232: ICMP type 104 (code 47) 172.26.216.2 > 172.26.216.8 packet ignored

169233: ICMP type 104 (code 47) 172.26.216.2 > 172.26.216.8 packet ignored

169234: ICMP type 160 (code 178) 172.26.218.228 > 172.26.218.1

169235: ICMP echo reply (len 6 id 1 seq 25604) 172.26.218.1 > 172.26.218.228

169236: ICMP type 104 (code 47) 172.26.216.2 > 172.26.216.8 packet ignored

169237: ICMP type 104 (code 47) 172.26.216.2 > 172.26.216.8 packet ignored

169238: ICMP type 104 (code 47) 172.26.216.2 > 172.26.216.8 packet ignored

169239: ICMP type 104 (code 47) 172.26.216.2 > 172.26.216.8 packet ignored

169240: ICMP type 104 (code 47) 172.26.216.2 > 172.26.216.8 packet ignored

[gfullage]

It means the PIX is receiving ICMP packets with type 104 and code 47, which according to IANA (http://www.iana.org/assignments/icmp-parameters) are reserved. The PIX won't know what do with these and is ignoring them. You might want to do some investigation and see what exactly these are, and why 172.16.216.2 is sending them to 172.26.216.8

I don't believe they're causing any trouble, it's just the PIX doesn't understand them (I doubt any device would), and so is telling you so.

Also 172.26.218.228 is sending out ICMP's with type 160/code 178, which I have also not heard of.

[jmcgarry]

Thanks for your reply. I understand what you are saying and should have mentioned 172,26,216,2 is a cisco 3550. Know it is reserved but was wondering what / how the cisco 3550 is using it.

Thanks again,

John