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Port replicator/duplicator

I'm looking for a suitable open source (or similar) tool that will allow me to do port replication.  To explain:


On server A, I want a process to listen on a particular port (say 6666), and when the clients talk to this port, it is intercepted and sent to server B and C (or N number of servers) listening on some other port.

I know there's simple TCP plugs out there, but I'm after something a little smarter that at a minimum will duplicate the stream to any number of upstream servers and optionally be able to alter the packet payload.
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Tintin
Asked:
Tintin
3 Solutions
 
TintinAuthor Commented:
Alternatively a Perl script using IO::Socket (or any other module that's useful) will be accepted.

I'm going to have a go at writing my own, but not having done socket programming before, I'm not that confident as to how robust it will be.
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Alf666Commented:
What you're looking for is not a "port replicator", but a level 2 switch (load balancer), or a High Availability (HA) solutions.

There are a few projects resolving this kind of issues :

The Linux Virtual Server :
http://www.linux-vs.org/

The Linux High Availability System :
http://linux-ha.org/

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TintinAuthor Commented:
I probably should have used the term "redirector" instead of "replicator'.

Thanks for the info, but HA and Load balancing is definitely not what I want.

I'm pretty confident I can do what I need in around 20 lines of Perl code, so I'll see how I go.
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TintinAuthor Commented:
I've found a solution to my problem.  It involved modifying an existing Perl script and adding a few lines to modify the data and send it on to another host.

However, I'll leave this open for a little while and allocate points based on useful tools that people suggest.
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oumerCommented:
use iptables
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sunnycoderCommented:
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TintinAuthor Commented:
While none of the tools mention really do what I require, I'm going to allocate the points out to everyone.

BTW, netpipes is also a useful tool (although not in my case).
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