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Khidzir_MN
Staff
Khidzir_MN
Staff
April 29, 2025

Troubleshooting Tip: How to fix error 'Conflicts with gateway IP address' when adding Source NAT IP

  • April 29, 2025
  • 0 replies
  • 256 views
Description This article describes how to fix the error 'Conflicts with gateway IP address' when adding a Source NAT IP in the Network NAT or the Virtual Server NAT.
Scope FortiADC, FortiADC-VM
Solution

FortiADC will prompt the error if the NAT IP is the same as one of the Link Load Balance's Gateway IP.

  1. Go under Network -> NAT -> Source.

 

network_snat.png

 

  1. Go under Server Load Balance -> Virtual Server -> NAT Source Pool

 

slb_snat.png


This is currently the expected behavior. Using the gateway IP as the Source NAT IP may cause the return traffic to be misrouted or dropped, as the network devices might not distinguish between traffic destined for the gateway and traffic originating from it (from FortiADC).

 

Use a different IP from the Link Load Balance's Gateway IP to avoid the error.

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