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 -- network-manager-pptp does not change mtu even if specified https://bugs.launchpad.net/bugs/151112 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs