I moved from a Windows 2000 sp2 gateway to a SME 6.0.1-10 Linux gateway/firewall.
As I'm running a Quake III Arena OSP server on this machine, it would be very nice if my friends could connect to this q3a server to play along with those on the lan side.

I tried this rule added to /etc/rc.d/rc.local:

/sbin/iptables -A INPUT -p udp -d $ANY 28313 -j ACCEPT

However, this doesn't seem to work. The server is up and running and can be connected to via the lan interface (eth1)

As I'm complete new to this iptables thingie I don't know if this is the correct way. man iptables is way too difficult for me to understand as a newbie.

Could anyone help me with this?
Thanks in advance,

Lum-chan

Oh, if you need more info, I'll be more than happy to provide these

Kicking:

If there's more info needed, please let me know.
I'm a complete on iptables. I checked some firewall scripts and search on google.com for similair ways for opening a port to the localhost. I'm not looking for portforwarding.

I see a couple of potential problems. First is you adding the modification from rc.local. The problem is that the -A flag appends the rule to the end of the INPUT rule set and if there is a rule that drops or rejects the packet before this one, the packet will never get accepted (iptables checks the rules in order and handles the packet according to the first match). You need to look at your entire firewall ruleset.

The second problem I see is the -p udp flag. Now I know absolutely zilch about Q3, but don't you need to allow tcp packets as well? Also, if this is your firewall/gateway I'm assuming your friends are pointing directly at this IP address, in which case you don't really need the -d flag.