Vigor Router supports VPN pass-through to pass VPN traffic router's LAN. To do this, you will need:
1. Disable the VPN service on the router: Go to VPN and Remote Access >> Remote Access Control Setup, un-check the VPN protocol that you want to forward to the router's LAN.
2. Go to NAT >> Open Ports, and open the required port to the IP address of the VPN server. The ports required for each protocol are:
3. For IPsec that uses PKI authentication, it is necessary that “Accept large incoming fragmented UDP or ICMP packets” is enabled at Firewall >> General Setup.
Noted that there are some limitations of IPsec VPN pass-through due to the incompatibilities between IPsec and NAT:
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