Bridge-nf problem with "iptables FORWARDING --in-interface eth0"

Bridge-nf problem with "iptables FORWARDING --in-interface eth0"

Post by Michael H?ge » Fri, 27 Aug 2004 16:33:19


i have set up a full working bridge. Everythin runs fine. I am only
having some problems with configuring the iptables firewall.

I want to set up some rule like the following one

iptables -A FORWARD --in-interface eth1 --out-interface eth0 -p tcp
--dport 8080 -j LOG
iptables -A FORWARD --in-interface eth1 --out-interface eth0 -p tcp
--dport 8080 -j ACCEPT

IPTABLES accept the rules  without error but it doesnt work. No packets
match the rules and they all get forwarded without

The exact same iptables command without specifying the --in-interfaces
and --out-interface works fine.

I would be glad if anyone can help me.



1. Local forwarding with "iptables" gives "invalid arguments"

Dear all,

while trying to set up a reverse proxy I ran into serious trouble with

I'm trying to forward locally generated traffic to a remote machine.
But a command like

# iptables -A OUTPUT -t nat -p tcp -d -j DNAT

fails with the laconic message "iptables: Invalid argument" which is
not helpful in any way.

I' running SuSE Linux Enterprise Server (last try was with their kernel
and, YES, I have already rebuilt the kernel after setting

Actually I built several kernel by now, the last one with all netfilter
stuff compiled in (not as modules).

However, the result stays the same whatever I try, that damn "Invalid

How can I find out what is the reason for that, how can I debug this
kind of stuff in a way that enables me to find what "argument" is
"invalid" here for what reason.


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