source based routing - network unreachable

I have a debian sarge router with 3 NICs, one on the LAN, two have
external IPs from my ISP (DSL). I want some hosts on my LAN to use one
IP (with NAT), and other hosts to use the other IP. I have a rule to
match the hosts I want and I've created a table called "servers" that
uses a different interface/IP than the main routing table. The problem
is that even though both sets of commands are basically identical
except for the interface they work with, the one operating on the
"servers" table fails.

THe very last line fails with "RTNETLINK answers: Network is
unreachable". Presumably it means $INET_NET is unreachable, and hence
using a host on that network ($INET_GW) isn't possible so it fails.
Since there's a route to that network already created on both the
"main" and "servers" tables I don't understand why.


EXT_IFACE_1="eth1"
EXT_IFACE_2="eth2"
INET_GW="????????" #my ISPs gateway
INET_NET="????????/24" #my ISPs subnet
LAN_NET="10.0.0.0/16"

echo "# MAIN TABLE - $EXT_IFACE_2"
ip route add $INET_NET dev $EXT_IFACE_2
ip route add default via $INET_GW dev $EXT_IFACE_2

echo "# SERVERS TABLE - $EXT_IFACE_1"
ip route add $INET_NET dev $EXT_IFACE_1 table servers
ip route add default via $INET_GW dev $EXT_IFACE_1 table servers

> echo "# SERVERS TABLE - $EXT_IFACE_1"
> ip route add $INET_NET dev $EXT_IFACE_1 table servers
> ip route add default via $INET_GW dev $EXT_IFACE_1 table servers

is $INET_GW realy part of the subnet of eth1?

jewo wrote:
> > echo "# SERVERS TABLE - $EXT_IFACE_1"
> > ip route add $INET_NET dev $EXT_IFACE_1 table servers
> > ip route add default via $INET_GW dev $EXT_IFACE_1 table servers
>
> is $INET_GW realy part of the subnet of eth1?

Yep.

INET_GW = x.y.246.254
eth1 uses x.y.246.186
The subnet is x.y.246.0/24

I'm really confused because all the commands are literally cut/paste
from setting up eth2, but it doesn't work.

Still beating my head against the wall, heres my script:

ip route flush table main
ip route flush table servers

ip rule add from $LAN_NET_SERVERS table servers

ip route add $INET_NET dev $EXT_IFACE_2
ip route add default via $INET_GW dev $EXT_IFACE_2

ip route add $INET_NET dev $EXT_IFACE_1 table servers
ip route add default via $INET_GW dev $EXT_IFACE_1 table servers
#At this point the command above fails with "RTNETLINK answers: network
unreachable"

ip route add $LAN_NET dev $LAN_IFACE