On Jan 11, 2008 1:24 PM, Patrick McHardy <kaber@xxxxxxxxx> wrote: > Damien Thébault wrote: > > > > By the way, Patrick, what do you think about this bug? Maybe I > > shouldn't rely on bridges but it's a useful feature sometimes. > > > > No, this should work properly. I just tried to reproduce it, > but I only get a single POSTROUTING invocation. I tried with > real bridged traffic, traffic routed between two different > bridge devices and traffic routed between a bridge device > and a normal ethernet device, but everything seems to work > correctly. > > Could you send me the commands you're using to configure > your setup and everything (routing, iptables, ...) that > could be related? > On the router, I'm using this script : ifconfig eth0 0.0.0.0 up brctl addbr br0 brctl addif br0 eth0 ifconfig br0 192.168.1.70 up ifconfig br0:0 192.168.2.70 up iptables -t nat -A POSTROUTING -d 192.168.2.0/24 -j MASQUERADE iptables -t nat -A PREROUTING -d 192.168.2.250 -j DNAT --to-destination 192.168.2.50 modprobe nf_nat_ftp echo 1 > /proc/sys/net/ipv4/ip_forward And for logging : modprobe ipt_LOG iptables -t raw -A OUTPUT -p tcp --dport 21 -j TRACE iptables -t raw -A OUTPUT -p tcp --sport 21 -j TRACE iptables -t raw -A PREROUTING -p tcp --dport 21 -j TRACE iptables -t raw -A PREROUTING -p tcp --sport 21 -j TRACE I only have one interface (eth0), that's why I use br0 and br0:0, so the wireshark captures show each packet twice, input on br0 and output on br0:0 (or input on br0:0 and output on br0) when capturing on eth0. On the ftp client/server : ifconfig eth2 192.168.1.50 ifconfig eth2:0 192.168.2.50 ip route del 192.168.2.0/24 ip route add 192.168.2.0/24 dev eth2 via 192.168.1.70 And then I try to connect to 192.168.2.250, this will use the router 192.168.1.70 on eth2, wille be DNATted to 192.168.2.50 and will come back on eth2:0 on the ftp server. Like the router captures, we have eth2 and eth2:0 together when capturing on eth2. This configuration will work fine, but if I run any of this on the router, it will not work well anymore : ifconfig br0:0 192.168.2.7 up or ifconfig br0:0 192.168.2.170 up I don't think I'm using anything else. -- Damien Thebault - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
