Chapter 12
Tunneling and VPNs
RUGGEDCOM ROX II
CLI User Guide
372 Managing L2TP Tunnels
Parameter Description
beacon-interval { beacon-interval } Synopsis: { off } or a 32-bit signed integer between 10 and 3600
Default: 60
The Round Trip Time (RTT) of the sent message
3. Add GOOSE or generic tunnels as required. For more information, refer to Section12.5.3, “Adding a GOOSE
Tunnel” or Section12.6.3, “Adding a Generic Tunnel”.
4. Type commit and press Enter to save the changes, or type revert and press Enter to abort.
Section12.3
Managing L2TP Tunnels
The Layer Two Tunneling Protocol (L2TP) is used primarily to tunnel Point-to-Point Protocol (PPP) packets through
an IP network, although it is also capable of tunneling other Layer 2 protocols.
RUGGEDCOM ROX II utilizes L2TPD in conjunction with Libreswan and PPP to provide support for establishing a
secure, private connection with the router using the Microsoft Windows VPN/L2TP client.
IMPORTANT!
L2TPD listens on UDP port 1701. If a firewall is enabled, it must be configured to only allow
connections to L2TPD through IPsec. Direct connections to L2TPD must be prevented.
CONTENTS
• Section12.3.1, “Configuring L2TP Tunnels”
• Section12.3.2, “Configuring DNS Servers”
• Section12.3.3, “Configuring PPP Options”
• Section12.3.4, “Configuring WINS Servers”
Section12.3.1
Configuring L2TP Tunnels
To configure L2TP tunnels, do the following:
1. Make sure the CLI is in Configuration mode.
2. Navigate to tunnel» l2tp and configure the following parameter(s) as required:
Parameter Description
enabled Enables L2TP.
local-ip { local-ip } Synopsis: A string 7 to 15 characters long
The local IP address. When set, all L2TP interfaces (l2tp-ppp-0, l2tp-ppp-1, etc.) will use
the same IP address. To use different local IP addresses (chosen from an IP pool) for
different L2TP interfaces, leave this parameter empty.
first-ip { first-ip } Synopsis: A string 7 to 15 characters long
The first address in the IP address pool. If local-ip is not set, both local and remote IP
addresses will be taken from this pool.
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