Multi-IP

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NAT with multiple public IPs on an external interface

Last adaption: 02.2023

New:

Layout adjustments and updated screenshots
[| Create a port filter rule] updated

notemptyThis article refers to a Beta version

Introduction

This article describes how to create and configure a network object for port redirection or port forwarding over a specific IP when multiple public IPs are present.

Port redirection or port forwarding is applied only to the smallest IP on a network object.
Consequently, in order to be applied specifically to another IP, it is necessary to set up additional network objects:

Scenario:
- Assigned network: 198.51.100.48/29
- IP 1: 198.51.100.49/29
- IP 2: 198.51.100.50/29

Preparation

→ Network →Network configurationTab Network interfaces Button Tab IP Addresses
The IP addresses on the interface must be entered here

Create a new network object

Create a new network object with → Firewall →PortfilterTab Network objects Button Add object

Labeling	Value	Description
Name:	external-interface-IP2	Arbitrary, unique name
Type:	Static interface
IP address:	198.51.100.50/29	Selection of the IP to be configured (will be adjusted in the following step)
Zone:	firewall-external
Group:		if necessary, a group to which this interface is to be assigned
Save and open again with

Address:	198.51.100.51/32	Change the subnet mask /29 to /32 so that only this IP is addressed!
Save

Search for the network object external-interface and click the button
The external interface must be edited so that it only affects this IP in further, general rules and does not inadvertently provide the other IP with rules.
Address:	198.51.100.49/32	Entry of the 1st IP address on the existing interface (change to suffix with tab key) Existing address 0.0.0.0/0 applies to all IP addresses! \|\| rowspan="2" class="bild noborder" style="border-top: 1px solid red;" \|
Save For each additional IP address, another separate network object must be created!

Creating a port filter rule

Create a new port filter rule under → Firewall →PortfilterTab Portfilter Button Add rule:

Labeling	Value	Description	Port forwarding rule
Active:	On	Activate so that this rule takes effect
Source:	internet	Select the Internet as the source
Destination:	Server1	Select the desired destination, as an example here the network object Server1
Service:	https	Desired service/port. Here: Port 8080 (https)
Action:	Accept	Select Accept
Logging:	Short - Log three entries per minute	Selecting an option from Logging
Group:	default	Select any group
[-] NAT
Type:	Destnat	Als Typ Destnat auswählen
Network object:	external-interface-IP2	Interface configured with the desired IP
Service:	https	Desired service / port

Close → Update rules