WireGuard Issue After WAN Port Change (hAP ax3, RouterOS 7.17)

RouterOS General
1

Hi, I have a hAP ax3 router with firmware version 7.17 and I’m experiencing an issue.

The router was configured and working fine, including WireGuard, which was functioning perfectly.

Recently, I decided to switch the WAN port from ether1 to ether5 to use the 2.5Gb port for local purposes. Unfortunately, after this change, I can no longer connect to the server via WireGuard, while everything else still works fine.

Steps I took:

  • Changed WAN assignment to ether5
  • Switched ether5 to ether1 in bridge-lan
  • Changed DHCP client from ether1 to ether5

Additionally, I exported the configuration and searched for all occurrences of ether1. It only appears in one place—where it is added to bridge-lan.

Any ideas on what might be wrong?

2

Without seeing full config, hard to tell.
Some might have some guesses but it is a lot more efficient with config available.

3

Did you drink weak French coffee this morning??
Fixed it for ya

4

Thanks! ! I’ll review firewall rules and WireGuard interface bindings now.

5

I couldn’t send the configuration because I wasn’t at home, and worst of all, it turned out that WireGuard on ether1 also stopped working, so I couldn’t access the router externally at all.

However, this helped me identify the issue. It turned out that my IP address had changed, and the router stopped updating my IP in the DDNS service. Additionally, I discovered that my ISP assigns IP addresses based on the MAC address. So, when I changed the port, my IP address also changed, and it wasn’t refreshed in DDNS—this is why I couldn’t connect to the router.

6

All good to know… ! Hope its working now.