Ive got MX's located overseas eg Vietnam, Thailand, Singapore.  Im using a Global Roaming SIM with its parent carrier based in HK (hence all internet traffic comes out of the HK gateway).   The cellular backup for Meraki management traffic and direct internet traffic works fine with the Global Roaming SIM, but the moment we try to launch Meraki VPN, it fails as if something in the Global Roaming path is blocking it.   Global Roaming does create carrier to carrier tunnels I think and that may reduce the payload MTU and MAY interfere with VPN..  Also, the MTU size selection in Meraki is not selectable for Cellular WAN interface so we could not reduce MTU.   Does anybody know if a local SIM works in Asian countries for cellular Meraki VPN ? Has anybody else seen this problem before and what did you end up doing ?   Thanks ... View more