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2 VPN Connections Through DLINK Router - Connectivity Dropping

I have a situation where two end-users use the same DLINK DI-624 Router at home to connect to the same VPN at work.  When they are both working at home together (same location), the frequently get disconnected from the VPN.  This does not happen if only one of them is connected.  Is there a setting in the router that may be coming into play?  Your help is greatly appreciated.  Their ISP is Comcast High Speed Cable.
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Carlos Hernandez
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It is almost always problematic to run multiple pptp through a single NAT.  The reason is technical and is related to GRE protocol mapping at the router.

The simplest and best solution is to use two external IP addresses on the router and masquerade each internal client to a unique external address.

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It sounds to me like you have two users connecting at once, and the problem is that they are using too many of the same settings. In particular, the problem sounds to me like that they both likely have the same network as their homes, the default address for a d-link.

So for example
Your work d-link subnet is 10.10.10.x/24
User A's network is 192.168.1.x/24
User B's network is 192.168.1.x/24

So when both connect, the router at the HQ gets confused about where to send packets to get to 192.168.1.x. Does it go to A's house or B's house?

I would try reconfiguring one of the home user d-link routers to be on a different subnet address block and try it again.
As long as NAT traversal is supported and turned on and the VPN concentrator is configured to allow multiple connections from a source IP then two users connecting from the same house hold should not be a problem.  Also you may need to turn off split tunnel to force each client to have an isolated connection to thier VPN.  

This is not an unusually practice.  Multiple contractors and vendors connection to the same corporate VPNs on a regular bases using customers NAT'd networks being on the same subneted network everyday.
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