Mutliple IP Nat on one NIC

Schnafi

Member
Apr 15, 2020
4
0
6
23
Hi guys,

I got another problem today.

I got a proxmox node (running version 6.1-8) that has got one public IP (lets say A.A.A.A) and one secondary IP (lets say B.B.B.B).
I also got a bridge with the internal network 192.16.8.0/24 where every VM gets an IP. Currently my setup is working and I can portforward to my containers/VMs without a problem

But what I would like to do is to forward the port 2020 to one of two VMs depending on the destination IP
For instance:

A.A.A.A:2020 gets forwarded to 192.16.8.100:2020 B.B.B.B:2020 gets forwarded to 192.16.8.200:2020
Is this possible and how could I do this? I read on the forum (here) that something like SNAT could work but I am not sure how the iptables command should look like. Is the following example code somehow working for my needs?

iptables -t nat -A PREROUTING -p tcp --dport 8188 -j DNAT --to-destination 192.168.1.10:80 iptables -t nat -A POSTROUTING -p tcp --sport 80 -s 192.168.1.10 -j SNAT --to-source 213.214.215.216:8188



Thanks in advance
 
Thank you for your response.
I fixed it by using the -d flag instead of the interface flag -i vmbr0
post-up iptables -t nat -A PREROUTING -d A.A.A.A -p tcp --dport 2020 -j DNAT --to 192.168.8.100:2020
post-up iptables -t nat -A PREROUTING -d B.B.B.B -p tcp --dport 2020 -j DNAT --to 192.168.8.200:2020

What I would like to do now is to rewrite the source ip 192.168.8.200 to B.B.B.B instead of A.A.A.A
I tried it with iptables -t nat -A POSTROUTING -s 192.168.8.200 -j SNAT --to--source B.B.B.B
But this doesn't work.. Any quick ideas?
 

About

The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!