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Old 11-25-2005, 07:44 AM   #1
LQ Newbie
Registered: Jul 2005
Location: Sussex, England
Distribution: SUSE 9.3, Ubuntu Breezy
Posts: 14

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suse router problem, laptop cannot access internet


I have posted about this problem in the past, and it was once working, but for some reason, without tweaking, a problem has arisen.
I'm at university, and i have my suse 9.3 box connected to the network in my halls. i want tom use this box as a router, to give my ubuntu laptop internet access. I followed this guide:
which did get the connection working, but then randomly, it stopped working.
when connected to the PC, the laptop recieves an IP via DHCP, and it can ping both the internal and external NICs on the PC. However, the laptop cannot access the internet through the PC. i tried entering the IPTables commands found in this:
tutorial, and this fixed the problem once, temporarily, but now the problem is back
Im very puzzled!!!

thanks in advance
Old 11-25-2005, 04:29 PM   #2
Registered: Sep 2005
Location: Old Blighty
Distribution: Slackware, NetBSD
Posts: 536

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Routing information only exists until you reboot. You need to put the iptables commands in a config file. If your distro doesn't have a specifiec rc file for this, then put them in /etc/rc.d/rc.local.
Old 11-27-2005, 05:32 AM   #3
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Registered: Jul 2005
Location: Sussex, England
Distribution: SUSE 9.3, Ubuntu Breezy
Posts: 14

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ok, ive created a router config script, which ive placed into /etc/rc.d/ (although, im not certain this is the right directory)
anyway, even when i run this script, the laptop still cannot access the internet

here is the script im using

iptables -A INPUT -m state --state INVALID -j DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP

iptables -A FORWARD -i eth1 -o eth0
iptables -A FORWARD -i eth0 -o eth1

iptables -P INPUT DROP
iptables -P FORWARD DROP

iptables -A INPUT -i eth1 -j ACCEPT
iptables -A INPUT -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

eth1 is the lan nic, and eth0 is the wan nic

the laptop cannot get a ping any furthur than eth0


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