Comset CM685V User manual
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How to configure L2TP over IPSec on the Comset CM685V Router
Network Topology:
To configure VPN L2TP over IPSec on the Comset CM685V router, please configure the
router with the correct APN that will provide you with a Public WAN IP address, such as
telstra.extranet for a Telstra Data SIM. You need to ask your carrier to activate your SIM card with
a Public WAN IP.
1. Configure APN settings for a Public WAN IP.
For Telstra Data SIM, go to Network-> Mobile -> APN -> telstra.extranet.
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2. Go to the Status Page to check the WAN IP address. The WAN IP address in this example
is 120.157.59.141. Use this WAN IP address on the L2TP/IPSec client settings.
3. Go to Services -> VPN -> IPSec-> and click on the Edit Button. Configure IPSec settings as
shown below.
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4. Click on “Save and Apply”.
5. Go to Services -> VPN -> L2TP-> and click on “Edit”. Configure the L2TP server as shown
below.
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6. Allow “Ping from WAN to LAN” on the Firewall security page.
Go to Network -> Firewall -> Security. Set “Ping from WAN to LAN” to “Allow”.
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7. Go to Network-> Firewall-> Traffic Rules. Enable “Allow-ALL-LAN-Ports”.
8. Configure DDNS settings on the router.
Go to Services -> DDNS -> click Edit on IPv4.
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On your Windows PC
1. Go to Network and Internet Settings -> VPN -> Add a VPN connection.
2. Set VPN Settings as below and click on the Save button.
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3. Go to control Panel -> Network and internet -> Network connections -> Right click on
“Remote VPN Server” and click on Properties.
4. On the Security tab, select L2TP/IPSec. Enable “Allow these protocols (CHAP and MS-
CHAP v2)”.
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5. On the VPN settings, click Connect on “Remote VPN Server”.
6. On the router GUI, go to Status -> VPN -> L2TP Status to check L2TP client.
7. Ping PC2 (192.168.1.5) behind the L2TP/IPSec server from PC1.
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