Question

Hello, I have a new RUT240 with 4G sim card, with DENAT service active on my mobile operator (I have a public IP, but it is not static, I use DDNS service for this reason)

Address translation works fine, but only on the same port.

If I map port forwarding on different internal port, it does not work .

EX. :  210.30.x.y  port 443 >> 192.168.1.20 port 443    WORKS

EX. :  210.30.x.y  port 5000 >> 192.168.1.20 port 443    NOT WORKS

why ???

Answer 1

Hi, I think you are using https server.

Does your server accept https headers with port 5000?

Comments

I have a small webserver : really there are 4 hardware honeywell servers for fancoils monitoring , behind rut240.

I tried port 443, port 1000, port 444, 5000, 10.000.... nothing.

It works only as NAT but not translate port.... It is a big problem :(

I have a single Public IP but 4 internal server, that I have to reach with a minimun of 4 external different ports.

For safety rule, it is better to change public port 443 in something else...

thank you!

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Can you list your RUT2 firewall rules via ssh or CLI?

iptables -S -tnat

It must do full NAT with port changes. It's not a special function.