I checked the code: it has been modified and the fix is no longer included, so
the MTU is always set to 1412 for VPN interfaces.
I tried to commenting the code which sets the MTU, so it should leave the value
set by pppd.
** Changed in: network-manager-pptp (Ubuntu)
Status: New => Confirmed
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network-manager-pptp does not change mtu even if specified
https://bugs.launchpad.net/bugs/151112
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