Here are the steps you should follow:
Type the IP address of the SirVPN server you want to connect to in the “Connect to” box (7).
To find the entire list of all available servers, sign in to your account on our website, go to “Setup” -> “VPN Servers“. If you don’t have a SirVPN account, you can try our services.
Type one more time the same hostname in the “Remote ID” field (10).
Enter your VPN username and password in the “User” and “Password” boxes (8).
To find your VPN username and password, sign in to your account on our website, go to “Setup” -> “VPN Username & Password“. If you don’t have a SirVPN account, you can try our services.
Click the “Enable” button (9).
Check “Last Link Up Time” (11) and “Uptime” (12) to ensure your VPN connection is UP.
Press “OK” (13) to close the window.
Click on “Apply” (23) to apply the changes and click on “OK” (24) to close this window.
In the “Mangle Rule” window, in the “General” Tab (27) select “prerouting” for “Chain” (28).
Enter the range of IP addresses in your LAN which you want to connect to VPN through this router in the “Src. Address” field (29).
Click on “Apply” (34) to apply the changes and click on “OK” (35) to close this window.
Click on the “+” icon (37).
Choose “SirVPN_UK1_L2TP” from the “Gateway” menu (40).
Choose “unicast” from the “Type” menu (41).
From the “Routing Mark” menu (42) choose the routing mark “SirVPN_L2TP” created at step 10 in “IP->Firewall->Mangle”.
Click on “Apply” (43) to apply the changes and click on “OK” (44) to close this window.
Enter the Google DNS addresses (or other open DNS you want) in the “Servers” field (46) and check the “Allow Remote Requests” checkbox (47).
Click on “Apply” (48) to apply the changes and “OK” (49) to close this window.
For example in our case it will be:
ping 8.8.8.8 interface=SirVPN_L2TP src-address=192.168.88.1