ubuntu port forwarding

Question

RDP

There is a home web server on ubuntu 10.04 server that distributes pppoe internet to home LAN.

Internet sharing is configured according to this manual : help.ubuntu.com/community/Internet/ConnectionSharing



/etc/rc.local /etc/iptables.sav
iptables-restore < /etc/iptables.sav
exit 0


*nat
:PREROUTING ACCEPT [10:1028]
:POSTROUTING ACCEPT [6:422]
:OUTPUT ACCEPT [14:1129]
-A POSTROUTING -j MASQUERADE
COMMIT
# Completed on Thu Mar 17 16:39:01 2011
# Generated by iptables-save v1.4.4 on Thu Mar 17 16:39:01 2011
*filter
:INPUT ACCEPT [121:15427]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [232:23484]
-A FORWARD -s 192.168.0.0/24 -i -eth0 -o eth1 -m conntrack --ctstate NEW -j ACCEPT
-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
# Completed on Thu Mar 17 16:39:01 2011
# Generated by iptables-save v1.4.4 on Thu Mar 17 16:39:01 2011
*mangle
:PREROUTING ACCEPT [13692:2096795]
:INPUT ACCEPT [3911:1206418]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [2297:430096]
:POSTROUTING ACCEPT [2423:449298]
COMMIT


Answer 1

iptables -t nat -A PREROUTING -p tcp --dport 3389 -i ppp0 -j DNAT --to 192.168.0.10
Replace ppp0 with external interface.

Answer 2

I think something like this (if I'm confusing everything correctly, because I rarely encounter iptables):
iptables -A PREROUTING -j DNAT -p tcp --dport 3389 --to-destination 192.168.0.10

Answer 3

there is an even simpler option - rinetd
is in native turnips.