another problem might be:
Interfaces –> WAN --> Block private networks
When set, this option blocks traffic from IP addresses that are reserved for private
networks as per RFC 1918 (10/8, 172.16/12, 192.168/16) as well as loopback addresses
(127/8). You should generally leave this option turned on, unless your WAN network
lies in such a private address space, too.
since your WAN lies in such a private address range you have to uncheck this checkbox