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22.7 Legacy Series / Re: PLEASE HELP! WAN FLAPPING!
« on: January 13, 2023, 09:16:23 am »OK, I'm getting desperate. Just when I think my changes based on recommendations are stable, my WAN port starts flapping again.
Any errors/collisions on Interfaces -> Overview --> WAN ?
And did you add any parameters to Interfaces -> WAN --> DHCP client configuration (one of the tabs)? Is 'override MTU' ticked?
I had similar issues when I started with opnsense some years back and had to add this to the 'Option modifiers':
supersede interface-mtu 0
Which was for a specific ISP here in my country, but it might help in your case.