WebGUI show Site to Site VPN is up but traffic cannot pass through
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Zyxel_Kevin
Posts: 958
Zyxel Employee





in VPN
Checking:
1)You have allow ESP Protocol from WAN to Device. Firewall cannot decrypt packets without allowing ESP rule.
2)You have allow rule for zone "IPsec_VPN" if you use Policy based VPN
(If you customize the VPN zone, please make sure you have the corresponding allowed rules)
3)Check you have correct static route/policy route if you use Route based VPN.
4)Check there is no overlap addresses with the peer subnet
You go to Maintenance -> Packet Flow Explore -> Routing Status to check all routes.
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