Hi All!
I have set MTU on the WAN interface to 1460 (Calculated PPP MTU: 1452).
Upon router reboot the MTU has the correct value:
sudo ifconfig
pppoe0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0 mtu 1452
description: WAN
But if I initiate "reload" from INTERFACES: OVERVIEW the MTU resets to 1460
sudo ifconfig
pppoe0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0 mtu 1460
Can it be a defect?
Thanks in advance!
I just tried and any MTU that was larger than the physical interface cannot accomodate is overruled.
Your hardware probably has an MTU of 1460 and there is a VLAN oder PPPoE around it (or a VPN tunnel).
Thanks!
I'm not aware of any hardware MTU limiting.
My setup is a VDSL2 router in bridge mode -> OPNsense.
As I expected. Ethernet MTU is 1500 or 1460 bytes and PPP takes another 8 bytes, so the calculated MTU of 1452 seems about right.
Same thing here, except that my physical ethernet interface can do >=1500 bytes minus PPP, so my calculated value is 1492.