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Re: TCPReplay problem
From: "Bojan Zdrnja" <bojan.zdrnja () gmail com>
Date: Fri, 28 Apr 2006 20:41:50 +1200

Ankur,

On 4/28/06, ankur jindal <ankurjn113 () hotmail com> wrote:
Hi all
Can we direct tcpreplay to send packets to another machine? If so what is
the command for that. I didnt see any documentation for that.
When it sends out packets on an interface is are they just sent to the next
ethernet or is tcpreplay used for testing the machine on which it is
installed. I assume it shouldn't be the latter case.

tcpreplay does just that - it will replay a captured pcap file.
So, whatever the source and destination addresses in the original pcap
file were, tcpreplay will put those on the network. This means that,
if the packets reach the original destination, only the first SYN
packet will have some meaning - the original host will choose a
different sequence number than the one which was recorded in the pcap
file and the rest of the communication will be dropped by the
destination (it will never receive a proper SYN/ACK packet from the
source; it will receive one recorded in the pcap file but it will have
incorrect sequence number).

I presume you want to use the pcap file to run an attack on a
destination -- you'll have to use a different tool for that (last time
I had to do this I manually crafted attack packets).

If you check the roadmap for tcpreplay you will see that some of these
features will probably be included in the 3.0 release.

Cheers,

Bojan

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