Win7 system dual network card at the same time connecting the internal and external network gateway conflict how to do

The specific solution is as follows:
1, first the external network card as normal configuration. Then configure the internal network card, pay attention to the default gateway of the internal network left blank;
2, route print, confirm 0.0.0.0 from the external network gateway;
If the current default is not the external network gateway, start cmd with the administrator , route delete 0.0.0.0,
then route add 0.0.0.0 mask 0.0.0.0 zzz.zzz.zzz.zzz (outer gateway).
3, route add -p 192.168.100.0 mask 255.255.255.0 192.168.100.1 if 14 Where, 14 is the internal network interface number, you can see from the route print. -p means to add a static route, that is, it will not be lost after reboot.