[opensuse] OT: How? access my local apache2 through two routers?


I'm behind two routers
1) and
2) ip to 1) is
3) my machine is

The port 80 of 1) is routed to another computer

Now I thought I can simply route port 81 on router 1) to port 81 on router 2): TCP 81 / 81 Always

And port 81 on 2) to port 80 on 3)

now I can access my pages with

so the port forwarding 81 to 80 from router 2) to my computer works
but I still can't access the pages from the external IP of the 1st router

How can I figure out what happens with the request to 1) on port 81?

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