Consulting some redirect port with windows to a iptables firewall

Consulting some redirect port with windows to a iptables firewall
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Subject Author Date
Consulting some redirect port with windows to a iptables firewall c4y0 11-05-2004
Posted by c4y0 on November 5, 2004, 10:26 pm
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Hi!

I have a firewall with iptables redirecting some port to a LAN machine.

I'm using this rules:

10.1.1.2= ip LAN machine

===============================================================
iptables -A INPUT -p tcp --dport 2021 -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 2021 -j DNAT --to
10.1.1.2:2021
iptables -A FORWARD -i eth0 -p tcp -d 10.1.1.2 --dport 2021 -j
ACCEPT

iptables -A INPUT -p tcp --dport 3333 -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 3333 -j DNAT --to
10.1.1.2:3333
iptables -A FORWARD -i eth0 -p tcp -d 10.1.1.2 --dport 3333 -j
ACCEPT

iptables -A INPUT -p udp --dport 2001 -j ACCEPT
iptables -t nat -A PREROUTING -p udp -i eth0 --dport 2001 -j DNAT --to
10.1.1.2:2001
iptables -A FORWARD -i eth0 -p udp -d 10.1.1.2 --dport 2021 -j
ACCEPT

==============================================================

When i consult the external IP thats ports with telnet in windows from
outside, can obtain response; but when consult with telnet in linux from
outside, i obtain satisfatory response.

I cant understand what happen!!!!! exist some differences between
windows and linux telnet? or i need make some change in the firewall
rules (i dont think so).

Thanks for your help!

Bye
obtain response;


Posted by Micheal Robert Zium on November 5, 2004, 11:42 pm
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c4y0 wrote:

>iptables -A INPUT -p tcp --dport 2021 -j ACCEPT
>iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 2021 -j DNAT --to
10.1.1.2:2021
>iptables -A FORWARD -i eth0 -p tcp -d 10.1.1.2 --dport 2021 -j ACCEPT

You need to decide what you want to do. Accept those ports into the
firewall itself, or forward it to your LAN computer. I suspect using
the last two lines is what you want.



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