Adam Kessel wrote:
I have a simple home router iptables setup. The router now runs Debian
Lenny; the client runs Ubuntu. Since the Debian upgrade, the forwarding
setup no longer works properly.
The iptables router has two NICs; one connects to the cable modem, the
other to an internal switch. Router is running Linux 2.6.26, iptables
1.4.2. The router box has no network issues with the Internet. I can
ping, surf
websites, etc.. The client box has no problems talking to the router.
Problem solved! For some reason, the MTU on my outward-facing NIC had
shrunk after the Debian Lenny upgrade. By increasing the MTU back to
1500 on that interface, everything works fine.
So it's not iptables fault.
I have no idea why the MTU would have been set lower after the upgrade,
but that's some other package's problem.
Adam
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