Question

Iptables Forwarding

Posted February 20, 2017 1.2k views
Ubuntu Networking

I have a PPTP VPN server running Ubuntu 14.04
It has multiple clients connected to it e.i.
Client A -> 192.168.1.210
Client B -> 192.168.1.211
Client C -> 192.168.1.212

It also has multiple external iP address on the same interface i.e.

eth0 -> XXX.XXX.XXX.XXX
eth0:0 -> YYY.YYY.YYY.YYY
eth0:1 -> ZZZ.ZZZ.ZZZ.ZZ

I want to be able to forward all traffic both udp and tcp traffic coming in on
XXX.XXX.XXX.XXX to Client A i.e.

XXX.XXX.XXX.XXX -> ClientA
YYY.YYY.YYY.YYY -> ClientB
ZZZ.ZZZ.ZZZ.ZZZ -> ClientC

I know this should be possible with iptables but not sure how to do it.

I’ve tried:
iptables -t nat -A OUTPUT -d XXX.XXX.XXX.XXX -j DNAT –to-destination 192.168.1.210

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