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

king6cong at king6cong at
Wed Aug 31 17:37:23 CEST 2011

In fact,UDP is enough for me,I heared that tcpdump and netcat can store and
resend the udp packages to get the replay effect,but I don't know how, or is
there some better way? I am working on a Linux server and only some basic
terminal tools are available :)

2011/8/31 Emile van Sebille <emile at>

> On 8/31/2011 6:35 AM king6cong at said...
>  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?
> I recently set up a standby spare fax server on a network that I also
> needed to test, and was able to tee the source transmissions to both
> systems.  That may be an option, particularly as it sounds like you've
> written a consumer of info and are not replying and interacting with the
> source.
> Emile
> --
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