Linux :
Here what you need to do just open terminal or you can use shortcut (Ctrl+Alt+T) then type :
$ sudo ip route add ${SUBNET} via ${GATEWAY_IP}
$ sudo ip route add 172.16.0.0/16 via 10.5.11.1
If you restart your system its all gone just open the file in “/etc/rc.local” and insert it there without the sudo.
Windows:
Open your cmd(command Prompt) and to the following:
C:\Windows\system32>netsh.exe
netsh>interface
netsh interface>ip
netsh interface ipv4>show interface
Idx Met MTU State Name
--- ---------- ---------- ------------ ---------------------------
1 4275 4294967295 connected Loopback Pseudo-Interface 1
27 20 1400 connected VPN Connection
11 4245 1500 connected Local Area Connection
15 4245 1400 disconnected Kerio Virtual Network
netsh interface ipv4>add route 192.168.0.0/16 11 10.5.11.1
Ok.
netsh interface ipv4>add route 172.16.0.0/16 11 10.5.11.1
Ok.
netsh interface ipv4>exit
If you wanted to check your where your routing goes issue the command below :
netsh interface ipv4>show route