VPN - why four IP's for one computer?

So today I Apple support was gracious enough to help get VPN services on my Mac Server working properly, or so we thought. Testing it on the LAN worked. Connecting VPN from the server's WAN IP worked too from within the office LAN. Now I'm home and trying to connect with the same settings and it won't work. I log on to the server with ARD so I can watch the VPN service log and can see that it is trying to establish a connection...actually it's trying to establish five connections:
Tue Aug 24 21:11:45 2010 : Directory Services Authentication plugin initialized
Tue Aug 24 21:11:45 2010 : Directory Services Authorization plugin initialized
Tue Aug 24 21:11:45 2010 : L2TP incoming call in progress from 'XX.XX.XX.137'...
Tue Aug 24 21:11:45 2010 : L2TP received SCCRQ
Tue Aug 24 21:11:45 2010 : L2TP sent SCCRP
2010-08-24 21:11:45 CDT Incoming call... Address given to client = 192.168.50.207
Tue Aug 24 21:11:45 2010 : Directory Services Authentication plugin initialized
Tue Aug 24 21:11:45 2010 : Directory Services Authorization plugin initialized
Tue Aug 24 21:11:45 2010 : L2TP incoming call in progress from 'XX.XX.XX.137'...
Tue Aug 24 21:11:45 2010 : L2TP received SCCRQ
Tue Aug 24 21:11:45 2010 : L2TP sent SCCRP
2010-08-24 21:11:47 CDT Incoming call... Address given to client = 192.168.50.208
Tue Aug 24 21:11:47 2010 : Directory Services Authentication plugin initialized
Tue Aug 24 21:11:47 2010 : Directory Services Authorization plugin initialized
Tue Aug 24 21:11:47 2010 : L2TP incoming call in progress from 'XX.XX.XX.137'...
Tue Aug 24 21:11:47 2010 : L2TP received SCCRQ
Tue Aug 24 21:11:47 2010 : L2TP sent SCCRP
2010-08-24 21:11:51 CDT Incoming call... Address given to client = 192.168.50.209
Tue Aug 24 21:11:51 2010 : Directory Services Authentication plugin initialized
Tue Aug 24 21:11:51 2010 : Directory Services Authorization plugin initialized
Tue Aug 24 21:11:51 2010 : L2TP incoming call in progress from 'XX.XX.X.137'...
Tue Aug 24 21:11:51 2010 : L2TP received SCCRQ
Tue Aug 24 21:11:51 2010 : L2TP sent SCCRP
2010-08-24 21:11:59 CDT Incoming call... Address given to client = 192.168.50.210
Tue Aug 24 21:11:59 2010 : Directory Services Authentication plugin initialized
Tue Aug 24 21:11:59 2010 : Directory Services Authorization plugin initialized
Tue Aug 24 21:11:59 2010 : L2TP incoming call in progress from 'XX.XX.XX.137'...
Tue Aug 24 21:11:59 2010 : L2TP received SCCRQ
Tue Aug 24 21:11:59 2010 : L2TP sent SCCRP
When the connection fails, the log shows five addresses hanging up:
2010-08-24 21:12:05 CDT --> Client with address = 192.168.50.206 has hungup
2010-08-24 21:12:05 CDT --> Client with address = 192.168.50.207 has hungup
2010-08-24 21:12:07 CDT --> Client with address = 192.168.50.208 has hungup
2010-08-24 21:12:11 CDT --> Client with address = 192.168.50.209 has hungup
2010-08-24 21:12:19 CDT --> Client with address = 192.168.50.210 has hungup
But I'm only one computer, and nobody at work even knows about the VPN service yet. I can connect to the server via FTP, SSH, AFP and ARD....My home service is merely a Time Capsule wifi/router attached to a Comcast cable modem.
Any ideas?
Thanks.
Message was edited by: AaronGM
Message was edited by: AaronGM

Quite simply - you're misinterpreting what's happening.
It seems clear that the client is attempting to connect 21:11:45 and the VPN server allocates the IP address 192.168.50.207 for this connection.
However, the client doesn't get this response and thinks the connection failed, so it attempts another connection at 21:11:47. For this connection the server allocates the address 192.168.50.208, but that also doesn't get back to the client (or the client rejects it), so it tries again at 21:11:51. This connection also fails and the client tries again at 21:11:59, after which it gives up and doesn't bother trying any more.
The various 'hangup's you see are actually timeouts - if you notice they're all exactly 20 seconds after the corresponding connection was attempted, so this is just the server's way of cleaning up the dead connections.
Your focus needs to be on why the client isn't getting the connection responses. This could be a firewall issue blocking the relevant traffic, or it might be a conflicting address in the client's network (you don't use 192.168.50.x at home, do you?)
A tcpdump on the client system would be my next step - see whether those responses are getting to the client or not.

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