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ip passthrough not working

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i am running a centro with firmware 6.16.12

the centro has ip address and behind my centro i run an router with ip adress


I configured the centro to ip pass through to this router and i see in my router that the WAN ip is the same as the centro WAN ip.


Behind my router with ip i am running a apache web server and the router is configured to expose he apache as virtual server.


Everything was running successful for a while and suddenly it stopped working.


Somehow my web server is not anymore accessible from outside.

I have done the following during trouble shooting:

I can access the web server from the inside LAN under the dynDNS name.

I cannot ping my external IPv4 address of centro from an external server ping.


What could be the issue?

Any advise on how to further investigate?




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