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[Archive] Conditions for Creating an L2TP Over IPSec Tunnel From Behind a Juniper Firewall in NAT Mode

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Article ID: KB4656 KB Last Updated: 27 Feb 2013Version: 5.0
Summary:
Conditions for Creating an L2TP Over IPSec Tunnel From Behind a Juniper Firewall in NAT Mode
Symptoms:

Cause:

Solution:

When creating an L2TP VPN tunnel from behind a Juniper Firewall device, ensure that the Firewall in front of the L2TP client meets the following conditions:

  • Interface-based NAT is not configured
  • Policy-based NAT does not use an egress interface as an outgoing IP address (Network Address Port Translation)
  • Dynamic IP (DIP) with port translation is not configured

Terminating an L2TP VPN tunnel from behind a Juniper Firewall device requires the following conditions:

  • Route mode is configured, and traffic initiated from the L2TP client is routed through the Juniper Firewall
  • A Mapped IP Address (MIP) is configured for the L2TP client PC
  • A DIP with a fixed port is configured on the outgoing policy

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