It is of course set to 1.
I already have DNATing on eth1 and it works very well.
I suppose my problem come from my routing table but I don't understand why no route is found to 172.16.1.4 coming from ppp0 with the current configuration.
Regards,
Raph
Alexander A. Naumov wrote:
Hi! May be you need to set /proc/sys/net/ipv4/ip_forward sysctl value to 1?
Best regards, Alexander A. Naumov
On Thu, Feb 19, 2004 at 03:45:06PM +0100, Raphael Benedet wrote:
Hi,
I have a problem with incoming connections on my Linux gateway.
I have 2 providers, cable modem on eth1 and dsl on eth2 <-> ppp0 (pppoe). The lan network is connected to eth0. At the moment, I have a very simple configuration where the default route is via eth1 (cable modem). I set up DNAT on ppp0 to forward incoming traffic for certain ports to a computer behind the gateway/firewall:
iptables -t nat -A PREROUTING -i ppp0 -p tcp -m tcp --dport 2000 -j DNAT --to-destination 172.16.1.4
Packets get lost and never reach the FORWARD chain (I logged all packets to be sure)
Here are my routes:
# ip route ls 215.136.169.1 dev ppp0 proto kernel scope link src 215.136.169.15 135.165.199.128/25 dev eth1 proto kernel scope link src 135.165.199.139 172.16.0.0/16 dev eth0 proto kernel scope link src 172.16.1.1 default via 135.165.199.129 dev eth1
So, I understand traffic by default goes via eth1, but why don't incoming packets redirected (DNATed) to an intranet IP address go out via eth0?
If I change my default route in table main to go via ppp0, then, it works. And DNATing on eth1 works with the current configuration.
I don't have any other routing tables nor complex routing rules: # ip rule ls 0: from all lookup local 32766: from all lookup main 32767: from all lookup default
I am running kernel 2.4.23 with Julian's patches.
Any help would be greatly appreciated. Thank you.
Raph
--
Raphael Benedet 3D Artists - raph.com "bringing art into the third dimension"
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