Solaris

Or you can just add 2 ip's to the /etc/defaultrouter file ...

There can be only 1 default gateway.

No, there can be one for each network ....

That's not what 'default' means. You can set gateways for each network yes, but there can only be 1 default gateway.

Im not sure what you mean here ... you add multiple entries to the /etc/defaultrouter file and reboot, do a netstat -rn and you will see multiple default gateways ... You can also do a

route -f add default 10.1.0.1
route add default 10.2.0.1
route add default 10.3.0.1

etc .... to flush all curent routes and add 3 default gateways for the 3 interfaces on 3 subnets configured on my imaginary box...

This defines default gateways for each subnet that is configured on the box ...

root[bash]@imaginary# netstat -rn

Routing Table: IPv4
Destination Gateway Flags Ref Use Interface
-------------------- -------------------- ----- ----- ---------- ---------
127.0.0.1 127.0.0.01 UG 1 4504755
10.1.0.0 10.1.0.5 U 1 100 bge0
10.2.0.0 10.2.0.5 U 1 200 bge1
10.3.0.0 10.3.0.5 U 1 300 bge2
default 10.1.0.1 UG 1 500
default 10.2.0.1 UG 1 501
default 10.3.0.1 UG 1 502


You can also add multiple default gateways in on the same subnet in the same way, they will be used in a round robin manner ...