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I have a host A on which I have 2 lxc container (X and Y).

I originally had port 22 on my host (A) forwarded to X. Using this configuration, I wasn't able to ssh out of the container X and when ssh-ing out of contianer Y, it caused the ssh connection to be some how forwarded to X (even though I was ssh-in to an external computer).

When changing the port 22 fowarding from the host to forwarding port 2222 to X:22 then everything went back to normal...

Is there a way to forward port 22 to an lxc container?

Iptables command I used to forward port 22 on host A to container X:

iptables -t nat -A POSTROUTING -s 10.0.0.4 -o eth0 -j MASQUERADE

iptables -t nat -A PREROUTING -p tcp --dport 22 -j DNAT --to-destination 10.0.0.4:22

Thanks.

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Fixed by adding the -i eth0 to my iptable rules (to specify only outside traffic should be redirected to container X:22.

iptables -t nat -A PREROUTING -p tcp --dport 22 -i eth0 -j DNAT --to-destination 10.0.0.4:22

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  • In my case, I had to add -i ens3. Just prepare to use the correct interface.
    – Sadeq Dousti
    May 27, 2018 at 18:21

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