cannot connect to some web site through pptp vpn

I have a PPTP VPN service on a Ubuntu server, and when I connect to it, I found I cannot connect to some web site, e.g. live.com.

I tried to ping the web site, but failed. So I tried tracert on windows, and below is the output.

Tracing route to live.com [65.55.206.154] over a maximum of 30 hops:

    1   784 ms   626 ms   821 ms  172.16.1.3
    2   513 ms   631 ms   964 ms  basil.vpsville.com [67.227.82.10]
    3   493 ms   483 ms     *     gw.mcom-colocationamerica.com [208.64.231.81]
    4   575 ms   496 ms   401 ms  tge4-1.cr2.lax.multacom.com [208.64.231.6]
    5   434 ms   379 ms   467 ms  microsoft.com.any2ix.coresite.com [206.223.143.143]
    6   592 ms   584 ms   941 ms  xe-0-0-0-0.lax-96cbe-1b.ntwk.msn.net [207.46.47.5]
    7   540 ms   528 ms   477 ms  ge-1-3-0-0.ash-64cb-1a.ntwk.msn.net [207.46.43.8]
    8   561 ms   695 ms   542 ms  ge-7-1-0-0.blu-64c-1a.ntwk.msn.net [207.46.43.17]
->  9   514 ms   800 ms   632 ms  10.22.100.1
    10     *        *        *     Request timed out.

The 9th record is very interesting, it does not seem to be a valid public internet address.

I have no idea how to troubleshoot this kind of network problem. I hope some can help me here.

thanks, David

Asked by user34600 (738 )
Jun 30, 2010 at 14:07