ip rule add prio 5 table main
ip route del default table main

ip rule add prio 10 from 192.168.0.0/24 table 10
ip route add default dev t1 src 192.168.0.1 proto static table 10
ip route append prohibit default table 10 metric 1 proto static

ip rule add prio 20 from 192.168.1.0/24 table 20
ip route add default dev eth1 src 192.168.1.254 proto static table 20
ip route append prohibit default table 20 metric 1 proto static

ip rule add prio 30 from 192.168.2.0/24 table 30
ip route add default dev eth1 src 192.168.2.1 proto static table 30
ip route append prohibit default table 30 metric 1 proto static

ip rule add prio 50 table 50
ip route add default dev eth1