i used at as A pppoe server i have used QINQ secend tag in rotuer
interface TenGigabitEthernet2/0/0.904
description Cust1-QINQ
encapsulation dot1Q 904 second-dot1q any
pppoe enable group PPPOE-SERVER3
interface Virtual-Template2
**mtu 1492**
ip unnumbered Loopback0
ip nat inside
no logging event link-status
peer default ip address pool interface localpool2
keepalive 15
ppp mtu adaptive
ppp authentication chap ms-chap ms-chap-v2 eap pap
ppp ipcp dns 8.8.8.8 8.8.4.4
ppp timeout idle 172800 either
end
the used is connected but they have some website not open and some application not working too i think the issue with MTU because i used double tag (qinq) so what MTU size must be ?