Could this be because network-manager-pptp always sets the "usepeerdns" flag to pppd (regardless of any settings the user may have made in network manager)? See this line:
http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/quantal/network-manager-pptp/quantal/view/head:/src/nm-pptp-service.c#L851
Could this be because network- manager- pptp always sets the "usepeerdns" flag to pppd (regardless of any settings the user may have made in network manager)? See this line:
http:// bazaar. launchpad. net/~ubuntu- branches/ ubuntu/ quantal/ network- manager- pptp/quantal/ view/head: /src/nm- pptp-service. c#L851