iptables redirects packets to local proxy

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Hello,

consider this scenario:

PC1 wants to telnet to SRV1 tcp 40000.

I would like to put a proxy in the middle that receives the
connection, rewrites the destination, sends packet to a local socks proxy (redsocks).

So the scenario would be:

PC1 --> PROXY tcp 20000 [iptables rewrites destination to SRV tcp 40000 --> redsocks 127.0.0.1 tcp 12345] --> SRV1 tcp 40000

I tried:
iptables -t nat -A PREROUTING -p tcp -s $MYSOURCEIP --dport 20000 -j DNAT --to $SRV1:40000

It works, but I know it doesn't go through redsocks.
I just changed the destination for the packets but how can I force them to flow into redsocks?

Thank you for any help, Ilic


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