On Sun, Feb 15, 2009 at 6:30 PM, Rayne <lancer6...@yahoo.com> wrote:
> Hi,
>
> I'm trying to replay traffic saved in a pcap file using tcpreplay 3.4.0 and I
> keep getting the warning messages:
>
> Warning: Unable to send packet: Error with PF_PACKET send() [277]: Message
> too long (errno=90)
> Warning: Unable to send packet: Error with PF_PACKET send() [2237]: Message
> too long (errno=90)
>
> (and so on with other numbers in [...])
>
> I've set the MTU of my receiving interface to 1520 bytes, and used tcpdump to
> verify that no packet in the pacp file is larger than that ("tcpdump -r
> FILENAME greater 1520" shows no output).
I assume you meant "sending" interface.
>
> The numbers in the square brackets are the same everytime I run tcpreplay, so
> I'm assuming they mean the 277th packet, 2237th packet, etc.
Yes.
> What is wrong?
Excellent question. No idea. My guess is either the said frames
really are larger then 1520 or your network card isn't actually
accepting the MTU change. Or maybe there is a Linux kernel bug. I'm
not aware of any bugs that would cause this problem on Linux.
I would use: tcpdump -r old.pcap -c 280 -w new.pcap
And load up the new.pcap in wireshark or tcpdump to take a look at
packet 277. Maybe it has a bunch of 802.1q vlan tags or ???
--
Aaron Turner
http://synfin.net/
http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & Windows
Those who would give up essential Liberty, to purchase a little
temporary Safety,
deserve neither Liberty nor Safety.
-- Benjamin Franklin
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