large icmp packet issue

ML ml at kenweb.org
Sun Sep 26 09:49:48 CDT 2010


On 9/25/2010 10:57 PM, fedora fedora wrote:
> I am having problem getting ping to work to a specific destination host when
> using large size icmp packet and i am hoping someone here can offer some
> suggestion.
>
> With regular ping, i can ping this remote host without any problem, but if i
> crank up the packet size to above 1500 (1500 still works), i won't get any
> icmp reply.
>
> My first thought was this was a pmtu issue. but when I ran tcpdump on this
> remote host, i saw the incoming ping requests and this host actually sent
> back icmp replies, so it appears that there is some device in between
> blocking these large size icmp reply packets.
>
> Here is the question, how can i find out which hop on the path is causing
> this behavior?
>
> FD

Can you provide a pcap file?




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