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I'm trying to forward port 80 on my wan to one of my local computers for testing a web service. But I cannot get it to work and I don't really know where to start.

I did set up TCP port 80 to my computers LAN address.

One strange thing is that when I look at the UI in AdvancedTomato I see one external IP (starting with 100) but when I look at wanip.info I get another IP (starting with 37)

Really strange. Any ideas?

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    Your ISP is likely using Carrier Grade NAT. Please read Alternatives to Port Forwarding & NAT: "There are four major problems that you may run into that would require alternatives to port forwarding. " ...
    – DavidPostill ♦
    Commented Oct 9, 2018 at 20:07
  • Thank you so much! Could get my ISP to give me a real public IP address. I didn't know about this (it was 10+ years since I did this the last time).
    – Ola
    Commented Oct 10, 2018 at 6:42
  • Ask your ISP if this is possible. It may not be as CGN is being used to get around a shortage of IPv4 addresses.
    – DavidPostill ♦
    Commented Oct 10, 2018 at 6:43

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