I''m trying to connect to two ISPs the connections are as follows:
Eth0
IP: 192.168.1.1
Mask: 255.255.255.0
Eth1
IP: 216.167.217.241
Mask: 255.255.255.0
Eth2
IP: 216.167.208.40
Mask: 255.255.255.0
Here are the commands to set things up:
#Load modules
insmod /lib/modules/2.6.19.2-
pyramid.metrix.net/kernel/net/ipv4/multipath_drr.ko
insmod /lib/modules/2.6.19.2-
pyramid.metrix.net/kernel/net/ipv4/multipath_random.ko
insmod /lib/modules/2.6.19.2-
pyramid.metrix.net/kernel/net/ipv4/multipath_wrandom.ko
insmod /lib/modules/2.6.19.2-
pyramid.metrix.net/kernel/net/ipv4/multipath_rr.ko
#Source IP routing for Eth2
ip rule add from 216.167.208.40 lookup 2
ip route add 192.168.1.0/24 via 192.168.1.1 table 2
ip route add 0/0 via 216.167.208.1 table 2
#Source IP routing for Eth1
ip rule add from 216.167.217.241 lookup 3
ip route add 192.168.1.0/24 via 192.168.1.1 table 3
ip route add 0/0 via 216.167.217.1 table 3
ip route add default equalize \
nexthop via 216.167.208.1 dev eth2 \
nexthop via 216.167.217.1 dev eth1
#Setup NAT
iptables -F -t filter
iptables -F -t nat
iptables -t nat -A POSTROUTING -o eth2 -j MASQUERADE
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
When the ip route add default equalize command is run it adds one default
route to the routing table:
pyramid:~# route -vn
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
216.167.217.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
216.167.208.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
0.0.0.0 216.167.208.1 0.0.0.0 UG 0 0 0 eth2
However looking at ip route show both routes are present:
pyramid:~# ip route show
216.167.217.0/24 dev eth1 proto kernel scope link src 216.167.217.241
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.1
216.167.208.0/24 dev eth2 proto kernel scope link src 216.167.208.40
default equalize
nexthop via 216.167.208.1 dev eth2 weight 1
nexthop via 216.167.217.1 dev eth1 weight 1
If I change the order of the routes for the ip route equalize command the
first route listed there is always show in the routing table. But the route
that is not listed by route -vn is always used.
I do not understand why a single default gateway is being added. To my
understanding no default gateways should be shown by route -vn.
Thanks.
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