This is not a bug of network manager. This is a bug in your network :)
pptp --nobuffer
will help you.
Please file new bug (feature request) about missing checkbox with this option..
I suggest that you are using PPTP over WiFi, does not it ?
** Changed in: network-manager (Ubuntu)
Same on karmic, performance seems impacted for me...
Jan 6 19:23:16 darkknight pptp[8268]: nm-pptp-service-8263
log[decaps_gre:pptp_gre.c:414]: buffering packet 138523 (expecting 138522, lost
or reordered)
Jan 6 19:23:16 darkknight pptp[8268]: nm-pptp-service-8263
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/35626793/Dependencies.txt
** Attachment added: Gconf.txt
http://launchpadlibrarian.net/35626794/Gconf.txt
** Attachment added: IfupdownConfig.txt
http://launchpadlibrarian.net/35626795/IfupdownConfig.txt
** Attachment
