It seems that this question is very similar to I suddenly can’t access my own web server within my LAN via the external WAN IP address but nothing there helped me so I'm trying again.
I have a router with WAN address 184.108.40.206 and local network 192.168.1.1/24. I have a web server running on 192.168.1.100.
In router settings, I have changed the port of management panel from 80 to 81 not to interefere with the webserver. Then I have added a port forwarding rule for TCP 80 -> 192.168.1.100:80. Finally, I have assigned a domain name example.com to 220.127.116.11 so accessing example.com correctly routes to my web server. From the world.
However, when I try to enter the example.com from any of the devices connected to the 192.168.1.1/24, it does not work.
I tried to diagnose it with ping, and the domain correctly resolves to the IP address so it seems like not a DNS problem:
root@linux:~# ping example.com PING example.com (18.104.22.168) 56(84) bytes of data. 64 bytes from 22.214.171.124.ip4.feromedia.eu (126.96.36.199): icmp_seq=1 ttl=63
Also, traceroute stops at the router:
root@linux:~# traceroute example.com traceroute to example.com (188.8.131.52), 30 hops max, 60 byte packets 1 192.168.1.1 (192.168.1.1) 0.350 ms 0.256 ms 0.195 ms 2 * * * 3 * * * 4 * * *
I have found neither NAT Loopback nor NAT reflection settings in my router as suggested in the question linked above. I have not configured anything in the static routing and I can't remember anything I could done that would cause such behavior.
My router is DrayTek Vigor2925.