From mboxrd@z Thu Jan  1 00:00:00 1970
From: "louie miranda" <lmiranda@chikka.com>
Subject: portfw on iptables 2.4 kernel problem.
Date: Tue, 10 Dec 2002 16:56:39 +0800
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I have an internel ftp server w/c i want to access over my linux router(gw)
Its internel IP is 10.0.0.11 and port 21. My externel IP lets say
203.100.100.1.
I followed the docs w/c i found at linuxdoc
http://www.tldp.org/HOWTO/IP-Masquerade-HOWTO/forwarders.html
I type in this iptables rule set,

iptables -A FORWARD -i eth0 -o eth1 -p tcp --dport 21 -m state --state
NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A PREROUTING -t nat -p tcp -d $EXTIP --dport 21 -j DNAT --to
10.0.0.11:21

I enabled ip forwarding thru the kernel by typing this command, (this is the
first thing i type then the iptables rule set)

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

svr:/# cat /proc/sys/net/ipv4/ip_forward
1
svr:/#

And still it does not work..

Trying 203.100.100.1...
telnet: Unable to connect to remote host: Connection refused





--
thanks,
louie miranda