After I connected my D-Link DIR 655 router to my Siemens SpeedStream DSL modem over PPPoE and following this advice to flush my system config, my MacBook Pro running Mac OS X Snow Leopard 10.6.8 can establish a VPN connection to my company's VPN server. However, there seems to be no traffic that can go through the VPN connection; it can't access any hosts on the remote site. Some diagnostics:

  1. The Windows laptop within the same Wi-Fi LAN can connect VPN and can talk to hosts on the remote site. This may rule out errors with the router / modem / remote hosts.
  2. The same Mac OS X laptop can connect VPN and can talk to remote hosts in our satellite office,
  3. Nothing remarkable in /var/log/system.log is seen
  4. Tried rebooting the Mac OS X laptop a few times. Tried set up a new VPN connection.
  5. If I send all traffic over the VPN connection, then it can connect to any Internet host.
  6. The Network setup panel for the VPN connection shows send activities but no receive activities.
  7. ifconfig shows:

    ppp0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1444
        inet 10.XXX.XXX.XX --> 10.XXX.XXX.1 netmask 0xff000000 
    

What else could I try?

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OK, I try a different router and it works for the Mac as well. don't know why. We use the same router in office, though it has a cable connection. – babytune Oct 26 '11 at 18:16
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migrated from stackoverflow.com Oct 27 '11 at 4:44

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