VPN2S not blocking by default UDP 500

PeterUK

With no L2TP VPN or IPsec VPN on the WAN only a IPsec VPN connecting to the LAN at 192.168.255.202 for Site-to-site.

Sending a Identity Protection (Main Mode) UDP 500 to the WAN replays with Informational by the VPN2S.

Workaround make firewall rule to drop from WAN to router.

Zyxel_Jeff

Hi @PeterUK

 

There are some points need to clarify:

(1)   What is your test topology? Could you illustrate it?

(2)   What is the symptom? and test procedure? Could you describe them more detailed?

(3)   Could you provide your configuration file(Maintenance > Backup / Restore > Backup) with and without workaround solution via private message to me?

PeterUK

VPN2S to WAN and make a windows 10 VPN L2TP connection over 4G to WAN of the VPN2S.

Send you a packet capture of the symptom and what you need to send to WAN on VPN2S.