How to save the packages received by a network interface or some port in a file and resend the packages received when needed?

Matty Sarro msarro at
Wed Aug 31 16:22:20 CEST 2011

Its possible using TCPDUMP and wireshark. however its a bit of a
manual process (open the pcap in wireshark, select the correct tcp
stream, and extract the file). I did this to show a vulnerability in
how medical images were transmitted in a university hospital once :)

Here are some guides, maybe it can serve as a jumping off point?

There are some C# libraries specifically for this:

Not sure if anything exists explicitly for python though.

On Wed, Aug 31, 2011 at 9:35 AM, king6cong at
<king6cong at> wrote:
> hi,
>   This is a question not specific to Python,but its related somehow,and I
> believe I can get some help from your fellow:)
>   I am doing my work on a server service program on Linux that processes the
> packages sent to the socket it listens.Their is already a old such service
> listening on the port doing its job,and
> I can't stop the old server service, and I need to get the packages sent to
> the old server and send them to my new server service to make sure it works
> well .How can I get the package and resent them to my new service? Is there
> such a tool or is there some functionality that tools such as tcpdump
> already provides?
> Thanks:)
> --

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