OK, I figured out what is goin on here. The difference between Hardy and Intrepid PPTP connections is that with Hardy the MTU is automatically set to 1416 during tunnel creation; this does not happen with Intrepid. I tested this hypothesis within Intrepid by issuing "sudo ifconfig ppp0 mtu 1416" after the tunnel was created and performance matches that of Hardy. The error messages in syslog have stopped as well. Here are the pptp startup parameters on both platforms:
INTREPID 32bit root 8459 8458 0 21:12 ? 00:00:00 /usr/sbin/pppd pty /usr/sbin/pptp a.b.c.d --nolaunchpppd --logstring nm-pptp-service-8458 ipparam nm-pptp-service-8458 nodetach lock usepeerdns noipdefault require-mppe-128 nobsdcomp nodeflate novj lcp-echo-failure 5 lcp-echo-interval 30 plugin /usr/lib/pppd/2.4.4/nm-pptp-pppd-plugin.so HARDY 32bit root 7060 1 0 21:45 ? 00:00:00 /usr/sbin/pppd pty /usr/sbin/pptp a.b.c.d --nolaunchpppd remotename a.b.c.d ipparam NetworkManager usepeerdns require-mppe-128 nodeflate nobsdcomp lock noauth mtu 1416 mru 1416 lcp-echo-failure 10 lcp-echo-interval 10 plugin nm-pppd-plugin.so -- Intrepid Slow PPTP Performance - retransmits and lost ACKs https://bugs.launchpad.net/bugs/292799 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
