MTU of 1412 from router not being set

Bug #1965218 reported by J.O. Williams
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Raspbian
New
Undecided
Unassigned

Bug Description

RPi-4 2gb using DHCP for IP4/6 addresses (dnsmasq router). My router sends out a the MTU size for my network as 1412. I run my own RPi-4 router which I use with Ethernet dongle.

OS
bullseye with an img date of 22-01-28 raspios-bullseye-armf

MTU after boot is 1500. dnsmasq uses:

dhcp-option-force=enx0050b63ab7db,26,1412 The enx... is the Ethernet USB 1Gbyte dongle.

I do not use pppoe (comcast) and the pppoe man page warns about 1412 using an larger mtu.

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