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Article:
  VPN on Mac OS X
Subject:   Re: Loss of internet when connected to VPN
Date:   2003-03-13 11:49:33
From:   anonymous2
Response to: Re: Loss of internet when connected to VPN

Thanks for the reply.
I have checked the order and Built-in Ethernet is above PPTP.
netstat -r normally gives:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.1.1 UGSc 6 4 en0
127.0.0.1 127.0.0.1 UH 14 3290 lo0
169.254 link#4 UCS 0 0 en0
192.168.1 link#4 UCS 1 0 en0
192.168.1.1 0:20:78:da:e3:e2 UHLW 6 0 en0 868
192.168.1.50 127.0.0.1 UHS 0 1 lo0


After connecting the VPN
Destination Gateway Flags Refs Use Netif Expire
default 10.1.2.150 UGSc 1 5 ppp0
10.1.2.150 10.1.2.151 UH 2 0 ppp0
127.0.0.1 127.0.0.1 UH 13 4107 lo0
169.254 link#4 UCS 0 0 en0
192.168.1 link#4 UCS 1 0 en0
192.168.1.1 0:20:78:da:e3:e2 UHLW 1 0 en0 1092
192.168.1.50 127.0.0.1 UHS 0 1 lo0
vpnsvr_address 192.168.1.1 UGHS 1 1 en0


Note: vpn server address obscured for security
It appears the VPN ppp0 interface completely replaces the default routing. Reversing the order makes no difference.


I can set the routes manually each time, but I don't believe this should happen.
I would expect to get a route to 10.0.0.0/8 via 10.1.2.150 and the default route left alone.
Note it adds a route via the original default gateway to the address of the VPN server.
There appears to be no way of setting no default route for the pptp interface.


Any other ideas,
Alban
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Showing messages 1 through 2 of 2.

  • Re: Loss of internet when connected to VPN
    2003-11-17 17:40:27  anonymous2 [View]

    I found an automated script for correcting the route here:
    http://www.macosxhints.com/article.php?story=20030313194656474

    works well for me, in panther, after some small mods.

    -millz
  • Jason Deraleau photo Re: Loss of internet when connected to VPN
    2003-03-13 11:53:10  Jason Deraleau | O'Reilly Author [View]

    Hmm. Coincidentally, this hint came through Mac OS X Hints earlier today:

    http://www.macosxhints.com/article.php?story=20030311232930261&mode=print

    It describes how to run pppd to make the VPN connection by hand, allowing you to remove the defaultroute statement. Apparently this is an unforeseen circumstance on Apple's behalf.