need utillity that can do complex tcp replay

Andre Gironda andre at
Tue Dec 12 16:42:58 UTC 2006

It appears that you have already found it.  what's wrong with tcp-replay?

i'm not sure exactly what you mean by "simulated client".  are you
looking for interactivity?

i saw this problem/need described well in chapter 4 of microsoft press
"Hunting Security Bugs".  the authors of the book provide a tool
called MITM (on their companion site). The book also provides a link
to a tool called Interactive TCP Relay

the Unix opensource tools netcat, scapy, and blackbag (especially
telson, blit) may also help out.

also, in particular for HTTPS, you may want to consider using a local
http proxy such as the very popular burpproxy.  there are scripts to
parse and replay burp's logfiles generated from request/responses
available in various places, including Network Security Tools from


On 12/12/06, william(at) <william at> wrote:
> I need to find utility for testing of application debugging issue that
> can replay captured ip traffic, something similar to description at:
> William Leibzon

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