主要命令如下,以后再添加注释
	
	vi /etc/iproute2/rt_tables #add lines 1 rt2; 2 rt3
  sudo ifconfig em1 up
  #sudo ip route add 111.161.101.252/30 dev em1 src 111.161.101.150 table rt2
  #sudo ip rule add from 111.161.101.150/32 table rt2
  #sudo ip rule add to 111.161.101.150/32 table rt2
  ifconfig
  sudo ip route add 192.168.0.0/24 dev em2 src 192.168.0.112 table rt3
  sudo ip rule add from 192.168.0.112/32 table rt3
  sudo ip rule add to 192.168.0.112/32 table rt3
  sudo ip route add default via 192.168.0.1 dev em2 table rt3
  ip route list table rt2
  ip rule show