Hello Everyone,
I configured a server for a friend's Internet cafe. He has 2 ISPs. Here is what I did:
## NAT -A POSTROUTING -s 10.0.0.0/255.255.255.128 -o eth2 -j SNAT --to-source 82.77.148.83 -A POSTROUTING -s 10.0.0.0/255.255.255.128 -o eth0 -j SNAT --to-source 83.103.190.175
## Removing default routing /sbin/ip rule add prio 50 table main /sbin/ip route del default table main
## Default gateway using nexthop /sbin/ip rule add prio 201 from 82.77.148.83/25 table 201 /sbin/ip route add default via 82.77.148.1 dev eth2 src 82.77.148.83 proto static table 201 /sbin/ip route append prohibit default table 201 metric 1 proto static
/sbin/ip rule add prio 202 from 83.103.190.175/27 table 202 /sbin/ip route add default via 83.103.190.161 dev eth0 src 83.103.190.175 proto static table 202 /sbin/ip route append prohibit default table 202 metric 1 proto static
/sbin/ip rule add prio 222 table 222 /sbin/ip route add default table 222 proto static nexthop via 82.77.148.1 dev eth2 nexthop via 83.103.190.161 dev eth0
## Running ping so kernel is aware if a gateway is down /bin/ping 82.77.148.1 >/dev/null & /bin/ping 83.103.190.161 >/dev/null &
My problem is that if the second gateway (83.103.190.161) stops responding the kernel will not notice and will keep forwarding traffic to it. Only if I "ifdown" the interface it will see it as down. As you can see above I run a continuous ping to both gateways. I'm just out of ideas...
[root@dell ~]# ip route show table 222 default proto static nexthop via 82.77.148.1 dev eth2 weight 1 nexthop via 83.103.190.161 dev eth0 weight 1 dead
Thanks, Bazy