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Linux - Networking This forum is for any issue related to networks or networking.
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Old 06-12-2003, 05:35 PM   #16
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Registered: Feb 2002
Location: Vancouver, BC, Canada
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Its been awhile here and just noticed that no-one had posted a definitive answer, so here goes:
1. Switch to a 2.4 + kernel with NAT/iptables (I never got it working with ipchains)

iptables -A PREROUTING -d -i eth0 -p tcp -m tcp --dport 412 -j DNAT --to-destination
iptables -A POSTROUTING -s -o eth0 -j MASQUERADE = your external IP

Or make your life easier and grab gShield from;

which was a big help to me for learning about NAT/iptables
Old 08-05-2004, 12:14 PM   #17
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Registered: Jul 2004
Location: RO, Bucharest
Distribution: Ubuntu
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another way of doing this (previous post didnt seem to solve my problem) is:

Things marked with bold should be changed to fit your set up:

eth0 - replace that with your external interface - replace that with your external ip (get your external IP from here )
yyy.yyy.yyy.yyy - replace that with the IP of the computer running dc++
zzzz - in DC++, File->Settings->Connection Settings, choose Active, in the IP box enter your external IP, in the port box enter any number (recommended to be higher than 1024). Modify the script below with the port you chose in dc++ settings. EX: 6666, 8888, 1400, etc.

Below are the 4 commands you need to run to make dc++ run in active mode while behind NAT:
/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 -d --dport zzzz -j DNAT --to yyy.yyy.yyy.yyy:zzzz

/sbin/iptables -t nat -A PREROUTING -p udp -i eth0 -d --dport zzzz -j DNAT --to yyy.yyy.yyy.yyy:zzzz

/sbin/iptables -A FORWARD -p tcp -i eth0 -d --dport zzzz -j ACCEPT

/sbin/iptables -A FORWARD -p udp -i eth0 -d --dport zzzz -j ACCEPT

Last edited by posto; 08-05-2004 at 12:15 PM.


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