ipchains and port masqerading
From: Crosis (firstname.lastname@example.org)
From: Crosis <email@example.com> Date: Mon, 24 Mar 2003 19:36:11 +1200
I admit I am still a newbie to linux and I am trying to learn to do
things for myself but I have become stuck so I find my self asking
what might be a stupid question for those in the know.
I want gateway / firewall to allow bidirectional traffic on port 17478
for a game that runs on my windows box. The gateway is using a 2.2.x
kernal with ipchains set up per the document by Gerhard Mourani -
Securing and Optimizing Linux: Red Hat Edition that RedHat had on
their site ( I cant find it now ).
Anyhow I have read several fine texts which lead me to the conclusion
that the following might work
ipchains -A forward -i $EXTER -p udp -s 192.168.0.10 17478 \
-d 0.0.0.0/0 -j MASQ
where $EXTER is the external interface.
this had no success so I added the line
ipchains -A forward -i $LOCAL -p udp -s 0.0.0.0/0 $UNPRIV \
-d 192.168.0.10 -j MASQ
where $LOCAL is the local interface and $UNPRIV is set earlier in the
script as UNPRIV="1024:65535"
Still no success
I used ipchains -L -M to see what was going on what I see is
prot expire source destination ports
UDP 02:38.77 192.168.0.10 18.104.22.168 17478 (62783)->17478
and a few www entries that are for web pages to connect
Any help would be appreciated