iptables?

[Gregory Nowak]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I think I see the problem.

Basically, you want to use --dport, instead of --sport. For example,
the way you have it now:

iptables -A INPUT -p tcp --sport 20:22 -j ACCEPT

means that you'd be accepting connections with source ports 20:22. If
I understand tcp/ip correctly, that could never happen with those
ports, I think they're used only for responding to already initiated
connections. So, if what you want to do is to allow connections on
ports 20:22 in this example into your box, use --dport.

Greg



On Sun, Mar 25, 2007 at 03:36:43PM -0700, Littlefield, Tyler wrote:
> Hello list,
> I've got the following iptables set.
> iptables -F
> iptables -A INPUT -p tcp --sport 20:22 -j ACCEPT
> iptables -A INPUT -p tcp --sport 80 -j ACCEPT
> iptables -A INPUT -p tcp --sport 110 -j ACCEPT
> iptables -A INPUT -p tcp --sport 3784 -j ACCEPT
> iptables -A INPUT -p tcp --sport 443 -j ACCEPT
> iptables -A INPUT -p tcp --sport 6666:6670 -j ACCEPT
> iptables -A INPUT -p tcp --sport 10000 -j ACCEPT
> iptables -A INPUT -p tcp --sport 20000 -j ACCEPT
> iptables -P INPUT DROP
> iptables -P OUTPUT ACCEPT
> I'm dmzed, and when I run this, it puts everything to filter.
> Any idea what I'm doing wrong?
> Thanks,
> ~~TheCreator~~
> _______________________________________________
> Speakup mailing list
> Speakup at braille.uwo.ca
> http://speech.braille.uwo.ca/mailman/listinfo/speakup

- -- 
web site: http://www.romuald.net.eu.org
gpg public key: http://www.romuald.net.eu.org/pubkey.asc
skype: gregn1
(authorization required, add me to your contacts list first)

- --
Free domains: http://www.eu.org/ or mail dns-manager at EU.org
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFGBwgX7s9z/XlyUyARAsCLAJ97NBM9eFYvQtGXAtO205j37fTk1gCfW+HS
ArSXMxhPWyq79WeX8FnJ8y4=
=Em7O
-----END PGP SIGNATURE-----