How do I set up remote AP on Nebula when the firewall is behind NAT?

Zyxel_JoyLee

Scenario:

Users may wish to use the remote AP service behind a NAT scenario. For example, in the topology below, the remote AP will establish a VPN service to the destination firewall USG Flex 100.

USG Flex 100 and AP must be in the same Nebula Site.

Users may wonder how to set up NAT port forwarding on the USG Flex 200. This article will guide you on how to execute it. 

Answer：

The remote AP service is based on VPN-related protocols, so users should configure a VPN-related service group that includes AH, ESP, IKE, and NATT services. The USG Flex 200 should execute NAT port forwarding on these ports toward the internal host USG Flex 100.

 Step 1:

Navigate to Object> Service > Service Group > to add a service group that includes AH, ESP, IKE, and NATT services. 

STEP 2:

Navigate to Network > NAT > to add a NAT port rule for the internal host USG Flex 100(192.168.11.34). 

STEP 3:

Navigate to Security Policy > Policy Control > to add a security policy to allow the Remote AP service to be forwarded to the internal host USG Flex 100 normally.

STEP 4: Remote access VPN configuration on USG Flex 100

Navigate to Configure > Firewall > Remote access VPN

WAN Interface:Auto

NAT Traversal:the public IP of the USG Flex 200