Could MTU cause VPN or website problems?
Yes. Encapsulation can make packets too large; broken path-MTU discovery may cause stalls. Test under the VPN/provider’s approved MTU guidance.
WAN/VPN MTU; fragmentation; ICMP; MSS.
Network engineering/employer IT.
Show the technical detail
On a managed Wi-Fi plan
Do not change MTU fleet-wide; engineering-led controlled test.
On another provider's router
Ask VPN provider/ISP for required MTU.
What to be careful of
Wrong MTU can worsen service.
Where this comes from: Official · see the original source ↗ · Draft—technical review · checked 17 August 2026