Question Plesk behind nat and multiples public ip adress

[vincent.jls]

Server operating system version

ubuntu 22.04.4

Plesk version and microupdate number

18.0.62

Hi,

Is there any risk to run plesk behind mutliple public nat ip adress ?
I'm facing some migration issues and i need to transfer a lot of website from one plesk to another, but i couldn't manage the dns record migration for theses websites.
I've aready test this solution with two public ip nat to one private, everything seems to work correctly.
But maybe there's something i missing...

Thanks,

 

[Kaspar@Plesk]

I you share a bit more details about your setup? How many servers with Plesk do you have running exactly?

 

[vincent.jls]

Hi,

I'm running dozens of plesk servers !
I have a router/firewall with all my public IP, each plesk server is exposed to internet with a nat/fw rule.
My goals is to move a lot of websites (cutoff migration) without any intervention in the customer dns zone of the websites (one website per client).
To achieve it i plan to sync website from my source plesk server to another one, and modify my nat rules to forward the traffic on the new one.

I have try this config and everything seems to be ok, but in plesk i can only map one public ip, so i'm little worried.

Thanks,

 

[ExPx]

Hello,

I have also same configuration. (multiple public IP's on NAT device + single Plesk instance)

 

[vincent.jls]

Hi ExPx,

Below the plesk support response :

Jul 22, 2024, 09:12 CDT Hello, Thank you for contacting Plesk Technical Support. My name is Alex Movergan and I'll be working with you. Overall having plesk behind NAT comes to correct mapping of IPs i.e. public->Private. But architecturally it only supports 1-to1 mapping: Running Plesk Behind a Router with NAT https://support.plesk.com/hc/en-us/...k-when-the-server-is-behind-a-router-with-NAT The area where it can affect Plesk functionality is DNS. However, if you manage DNS externally and use Plesk for hosting only, you can use the proposed configuration. Should you have any specific questions, please let me know.

 

[ExPx]

Because of 1-to-1 mapping, it seems not possible directly. I will try to add an extra local IP and map it to other public IP.

 

[scsa20]

Late response but yes you can only do 1 to 1 mapping. If you're able to just add multiple private IPs to the same network card by editing the netplan config or whatever config file you're using for the private IP assignment, then you can map the other public IPs to those other private IPs but I do not know what provider you use so not sure how everything is configured, if it's self hosted where you have complete control over everything then it should be straightforward to do, otherwise if you're using something like Azure, AWS, Linode, whatever, then you'll need to see how things are configured to allow you to assign additional private IPs to the NIC without adding additional NICs

 

[ExPx]

I have added extra IP to my NIC. It solved my situation. I will add extra NIC to the VM later as DHCP server needs special mac address for IP pinning.