Default Gateway is set to wrong interface after update/reboot

Started by artchzh, April 11, 2025, 03:54:58 PM

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Hi everyone!

We've recently run into the following issue the past month: After updating (or even rebooting), in some cases but not all, the default gateway is on the wrong interface (usually our management VPN interface, see attached screenshots).

What we've observed:

  • Management VPN comes up and works     
  • Restarting the Management VPN Wireguard service fixes the issue and the default Gateway is correct again     
  • Rebooting does not seem to fix the issue (on the contrary, rebooting seems to make it reappear)     
  • The issue has not been observed with Dual WAN setups

The settings we've checked:

  • Default gateway switching is enabled (when disabled, WAN would not fail-back after WAN1 came back online again)
  • Gateways are properly set up (priority 100 for fiber and 200 for copper WAN), both WAN ports are set as upstream gateways
  • Disabling routing in the Wireguard breaks our management VPN connection

Any advice would be much appreciated!