Layer 2 Tunneling Protocol (L2TP) establishes a Virtual Private Network (VPN) that allows remote hosts to connect to one another through a secure tunnel. It does not provide any encryption or confidentiality by itself but relies on an encryption protocol that it passes within the tunnel to provide privacy.
One of its biggest advantages of L2TP is that it encrypts the authentication process, which makes it more difficult for someone to "listen in" on your transmission to intercept and crack the data. L2TP does not only provide confidentiality but also data integrity. Data integrity is protection against modification of date between the time it left the sender and the time it reached the recipient.
This document aims to show you how to configure the L2TP Server settings on the RV34x Series Router.
Step 1. Log in to the web-based utility of the router and choose VPN > L2TP Server.
Step 2. Click the On L2TP Server radio button to enable the L2TP Server.
Step 3. Enter a number within the range of 128 to 1400 in the MTU field. The Maximum Transmission Unit (MTU) defines the largest size of packets that an interface can transmit without the need to fragment. The default is 1400.
Note: For this example, 1399 is used.
Step 4. In the User Authentication area, click Add for an additional set of choose a group profile where the users will be authenticated. The options depend on whether or not a group profile has been configured previously. The default options are:
admin — Special set of privileges to read/write over settings
guest — Read-only privileges
Note: For this example, admin is chosen.
Step 5. In the Start IP Address field, enter the starting IP address of the IP address range to be assigned to users. These are reserved IP addresses for L2TP users. A maximum of 25 sessions is supported.
Note: For this example, 10.0.1.224 is used.
Step 6. In the End IP Address field, enter the ending IP address of the IP address range.
Note: For this example, 10.0.1.254 is used.
Step 7. In the DNS1 IP Address field, enter the IP address of the DNS server.
Note: For this example, 192.168.1.1 is used.
Step 8. (Optional) In the DNS2 IP Address field, enter the IP address of the second DNS server. The default is blank.
Step 9. (Optional) Click the On IPSec radio button to enable the IPSec feature for L2TP. Internet Protocol Security (IPSec) provides security for transmission of sensitive information over unprotected networks.