设置内网和外网都能访问
sudo route add -net 172.16.56.0 -netmask 255.255.255.0 172.16.56.254
sudo route delete -net 172.16.56.0 -netmask 255.255.255.0 172.16.56.254
sudo route add -net 172.24.20.0 -netmask 255.255.255.0 172.16.56.254
sudo route delete -net 172.24.20.0 -netmask 255.255.255.0 172.16.56.254
