sudo route add -net 192.168.100.0/24 gw 192.168.2.2
sudo route add -net 192.168.13.0/24 gw 192.168.2.2

/etc/network/interfaces
up route add -net 192.168.100.0/24 gw 192.168.2.2 dev eth0
up route add -net 192.168.13.0/24 gw 192.168.2.2 dev eth0

sudo snmpwalk -v1 -c <RO-Community-String> <Host> <OID>