Default Gateway on Messaging gateway

Hello,

I'd need to understand the default gateway setting on SMG; version I am using is 10.5.1. I have two ethernet interfaces eth0 and eth1; default gateway we configured during the server installtion or the one visible under Administation --> Scanner --> Ethernet; it seems to get applied to eth0. Could we change the default gateway to get applied to eth1 as we have IP's in different subnets on eth0 and eth1 and I want to default gateway applied to eth1.

I know this can be done using "route add" command but that would not be permanent and erased incase of reboot.

Thanks!