Here's my situation:
I've got an Intel machine running a 2.6.9 linux kernel and this box has
4 modems attached to it via a usb to serial port expander. In order to
force data down each of the modems, some pretty simple rules are used
and they are as follows:
iptables -t mangle -A OUTPUT -p tcp --dport $PORT1 -j MARK --set-mark 1
iptables -t mangle -A OUTPUT -p tcp --dport $PORT2 -j MARK --set-mark 2
iptables -t mangle -A OUTPUT -p tcp --dport $PORT3 -j MARK --set-mark 3
iptables -t mangle -A OUTPUT -p tcp --dport $PORT4 -j MARK --set-mark 4
ip rule add fwmark 1 table isp1
ip rule add fwmark 2 table isp2
ip rule add fwmark 3 table isp3
ip rule add fwmark 4 table isp4
ip route add default via $GWIPADDR dev ppp0 table isp1
ip route add default via $GWIPADDR dev ppp1 table isp2
ip route add default via $GWIPADDR dev ppp2 table isp3
ip route add default via $GWIPADDR dev ppp3 table isp4
$PORT1 thru $PORT4 are unique and $GWIPADDR is the same for all 4 ppp links.
Using these rules, data going out of my Intel box is shaped nicely based
on looking at the transmit columns in /proc/net/dev.
On the receive side, all of the traffic is coming down the only kernel
default route, which is ppp0, and this is the problem.
Is there a way to use iptables to force answers for data going out a
given ppp link to be returned using the same link?
Thanks in advance for your help!!
- Cal
cspadoni@xxxxxxxxxxxxxx
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