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[ScreenOS] Virtual Private Network (VPN) between a Juniper firewall in Transparent mode and a Juniper firewall in Network Address Translation (NAT) mode

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Article ID: KB5136 KB Last Updated: 16 Jun 2010Version: 8.0
Summary:
Virtual Private Network (VPN) between a Juniper firewall in Transparent mode and a Juniper firewall in Network Address Translation (NAT) mode
Symptoms:
Environment:
  • VPN terminates at the Juniper firewall in transparent mode
Symptoms & Errors:
  • Cannot get Virtual Private Network (VPN) to work with transparent mode
Solution:

If the Virtual Private Network (VPN) tunnel uses the Juniper firewall in transparent mode as the termination point, the Juniper firewall in Network Address Translation (NAT) mode needs to specify the Transparent mode's VLAN1 IP address as the security gateway. 

The Juniper firewall in transparent mode, needs a Static default route with a gateway of the Internet router

Example:

Assumptions:

Internal network on the Juniper firewall/NetScreen device in Transparent mode is 10.1.1.0 255.255.255.0. The Internet router is at 10.1.1.10, and the Juniper firewall's VLAN1 IP address is 10.1.1.1

The other Juniper firewall is in NAT mode has untrust IP address 172.16.10.10.

On the Juniper firewall in NAT mode, in Phase 1, the Remote Gateway specified is the static IP address is 10.1.1.1, the transparent mode Juniper firewall's VLAN1 IP address.

On the Juniper firewall in transparent mode, the following static route is needed. From the CLI:

set route 0.0.0.0/0 interface untrust gateway 10.1.1.10 [Enter]

Additionally, on the Juniper firewall in transparent mode, in Phase 1, the Remote Gateway static IP address is the NAT mode's untrust interface IP address, which is 172.16.10.10.


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