[scottlamb]

Weird MTUs: DSL with PPPoE encapsulation, maybe? iirc they tend to use 1492 or 1452 rather than the usual 1500.

[synicalx]

Wow that's a trip down memory lane!

It would be 1492 to allow for another 8 bytes of PPPoE overhead, there are some scenarios where 1508 byte frames might be floating around but I don't really know if anyone adopted that standard.

[the_biot]

That is exactly what I have.