[clug] Access VNC server via DNAT

Damien Elmes clug at repose.cx
Sat Sep 20 23:37:44 EST 2003

"Joel Pearson" <pearj at writeme.com> writes:

> Hey,
> I have a vnc server that is on my local lan at home that I'd like to be able
> to access from the internet via my internet gateway linux box.  I've read a
> little bit about it but I can't get my gateway to forward to ports, I've
> tried this:
> iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 5904 -s -j
> DNAT --to
> But it says it can't connect to the server. At the moment I'm just trying to
> get the port forwarding to work on my local lan, but it doesn't seem to be
> working. I've read of people haveing this working using a somewhat similar
> iptables command, is there some module I'm supposed to load to make this
> happen?  My server is running RedHat 8 with iptables v1.2.6a
> Does anyone know why this isn't working?

Have you turned on ip forwarding?

echo 1 > /proc/sys/net/ipv4/ip_forward

(off the top of my head - path might be slightly different).

Also, I think you can omit the port on the destination.

Damien Elmes

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