NAT Same Port Different Public and Private IP

I do not know this particular router/modem. But I assume, that you have a conflict with the router management on port 80.  Try to move the system management (System Maintenance) to port 8080.

I would tend to agree but port 80 internally is treated different to port 80 externally.
With only one port 80 redirection set up it passes through okay, the problem only occurs when setting up mutlilpe redirections, example below:-

NAT > Port Redirection

Index No. 1 Enable [v]
WAN IP 2.WAN1 Alias[1]{external ip 1}
Public Port 80
Private IP 192.168.1.1
Private Port 80

Index No. 2 Enable [v]
WAN IP 3.WAN1 Alias[1]{external ip 2}
Public Port 80
Private IP 192.168.1.2
Private Port 80

Select allOpen in new window

Try alternative port 8080 for the redirection from the internet side to 80 internally and see if that works?  If so then check to make sure you don't have system management setup from the Internet side or change your management port.

What you want is not a port redirection.
The webform you are in should only give you the possibility to use primary public IP address (the one you use for outgoing connections) as your wan ip. The problem you are having is with the non-primary ip port redirection. Responses from your behind server are going through your primary ip and system gets blocked.
I see you have more NAT options, but by the names of this options I cannot tell you what they do.  Guess which one you need by reading router’s manual.

For the moment I'm just testing but in production I will need to use port redirection as I will need Public Port 80 to be translated to Private Port 8080.

I have attached another screenshot displaying the list of Public IPs meaning I should be able to redirect based off of the WAN IP.

Thanks

You are not wrong, is the web form the one is wrong. Port redirection does not take care of responses..... you can prove if am I wrong by making one port redirection, and start making changes of WAN IP.

You are going to make me take from internet your router's manual ;-).

Ahh, using WAN IP aliases it seems that the router makes use of them randomly... which I guess is what TI2Heaven meant with "redirection does not take care of responses.....".

Is there anyway to set up the below using a single router (DrayTek 2820)?
website1.com port 80 on public IP 217.1.1.1 to private IP 192.168.1.1
website2.com port 80 on public IP 217.1.1.2 to private IP 192.168.1.2

It seems such a simple request but I seem to be unable to find the answer.

Thanks

This is part of the answer. Have you redirect http traffic with 2 deferent public ip?.
To me it is ok to close the question if you fell you don’t need help for this issue.

.