I know that the isp supports frames of 1508 bytes, but I was never able to make it work in 19.07. Now I am trying to figure out how to do it in 20.02. I am using PPPoE with VLAN tagging and if I set mtu 1508
on wan, then it only changes MTU on eth0 (which is lan), but the wan interface remains 1500 and pppoe-wan is still at 1492. Anyone knows how to set mtu on wan to 1508?
The router is WRT32ACM with DSA.
Works in 22.03 for me now (wrt3200acm). Sharing for anyone who wants to give it a try.
config device
option name 'wan'
option mtu '1508'
config interface 'wan'
option proto 'pppoe'
option device 'wan.X'
option mtu '1508'
ifconfig pppoe-wan | grep MTU
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
ifconfig wan | grep MTU
UP BROADCAST RUNNING MULTICAST MTU:1508 Metric:1
ifconfig wan.X | grep MTU
UP BROADCAST RUNNING MULTICAST MTU:1508 Metric:1
Sweet. Could you name your ISP by chance?
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