Is the docker network the best practice? Why would one want double NAT? How to change default ports

[atais]

Checklist

• Have you pulled and found the error with jc21/nginx-proxy-manager:latest docker image?
  • Yes
• Are you sure you're not using someone else's docker image?
  • Yes
• Have you searched for similar issues (both open and closed)?
  • Yes

Describe the bug

Why is https://nginxproxymanager.com/advanced-config/#best-practice-use-a-docker-network considered "best practce"?

I am using now the docker network to connect all my internal services on a NAS, but actually this setup makes my life much harder because of docker networks NAT.

1. My internal network is 192.168.100.0/24
2. Docker internal netowrk is 172.29.16.0/24
3. I can't use access list rules, because all the IPs are being translated to the docker IP
4. I don't see correct IPs on audit log in my apps
5. but the benefit is that its easier to connect the services :D

I am no network master but I have technical background. I have consulted chatgpt and the docker's network is essentially a double NAT and its "expected behaviour" but i would consider this as a major downside of this "best practice".

On the other hand, I can't run network_mode: host because the ports 80, 81, 443 are occupied on my system.
So it would be extremely useful to me if I could change the default ports by using ENV values

Nginx Proxy Manager Version

2.13.5

Expected behavior

• I'd like to see the original IP in my logs
• Access List rules IPs should work
• change default ports with ENV values

Operating System

QNAP nas

NAT References:

• Can nginx proxy manager listen to ports other than 80 and 443? #3671

Port References:

• Custom listening port 80 443 81 #4748
• Can nginx proxy manager listen to ports other than 80 and 443? #3671