Iptables forwarding socks?

Question

linux

There are two servers with socks-proxy servers configured on them. 1.2.3.4:7200 and 1.2.3.5:7201
Is it possible to redirect the connection to the first or second server through the third server 2.2.2.2 through ports 7200 and 7201, respectively?
Through iptables on the third server configured port forwarding

iptables -t nat -A PREROUTING -d 2.2.2.2 -p tcp --dport 7200 -j DNAT --to-destination 1.2.3.4:7200
iptables -A FORWARD -d 1.2.3.4 -p tcp --dport 7200 -j ACCEPT

When trying to connect to Sox through server 2.2.2.2, in the logs on server 1.2.3.4 there is an attempt to connect, but without authorization.

Answer 1

Let's say the source has the address 3.3.3.3.
3.3.3.3 sends a packet to 2.2.2.2, which changes the destination address to 1.2.3.4.
The packet flies to 1.2.3.4, but the source address in it is still 3.3.3.3, not 2.2.2.2.
Therefore, the packet is sent back along the normal route, bypassing 2.2.2.2.