MTU/MRU problem with WAN interface (with VLAN)
I am facing a weird problem.
We changed the ISP on one of our USG40W running v4.38
This new ISP connects it clients with an ethernet connection (WAN port) with a VLAN inside.
Since this modification, we are facing issues with MTU/MRU on this WAN link.
The trunk is enabled (failover) on this router with the OPT port.
Here is the configuration of the WAN port:
Connectivity Check disabled
Here is the configuration of the VLAN port:
Interface type: external
Static IP 197.xxx.xx.x41 (public IP)
Connectivity Check enabled (ICMP 184.108.40.206 and 220.127.116.11)
This new WAN link is almost working, the problem is that the MTU cannot go higher than 1440 (and sometimes even changes, last time I was able to ping upon 1470)
And the MRU cannot go higher than 100 !
I'm stuck finding a solution on this one.
If we replace the Zyxel router with a router from another brand, the link works well and there are no problems with MTU/MRU, but with the Zyxel, we are stucked.
Any Idea ?
Thanks a lot in advance for your help,
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