From: Thees Peereboom 

Rich,

Thanks. I think it could be a router issue, too. We'll investigate further.

- Thees Peereboom

On Wed, 2 Apr 2003 14:23:33 -0800, "Rich"  wrote:

>   If using PPTP then it could be an issue with the router and GRE packets.
Some of the consumer firewall/routers support tunneling only a single
connection at a time.  The reasons for this is that they note that GRE
packets are being tunneled and send them all to the first internal client
to establish a session.  The proper behavior is use the call ID in the low
word of the GRE Key field for routing to the correct internal client.  See
http://www.ietf.org/rfc/rfc2637.txt.  The router vendor should be able to
identify whether they support multiple PPTP sessions or not.
>
>   If the clients were Windows 2000 or later another option would be to use
L2TP for the VPN session.  This too can have problems since the routers
don't all support this or multiple sessions of this either.
>
>Rich
>
>  "Thees Peereboom"  wrote in message
news:rqkm8vo0kqm2emfv5v0dch9t5henoj4o2p{at}4ax.com...
>  A friend has the following problem: His company has an office in A
>  with about 20 workstations and a W2K server which is also PDC adn
>  DNSserver. The workstations are w98.
>
>  This company also has offices in B and C, with each about 5
>  workstations. He wants the workstations in B and C to be on the same
>  network as A, log on to the PDC in the A-office and get their IPnumber
>  from the DHCP pool on the PDC in A.
>
>  The connections between the different offices are DSL. He has
>  installed and established a VPN from both B and C to A.
>
>  His problem is that he can't get to connect the workstations in B and
>  C to A. Without the VPN active it takes a very long time to login
>  (about half an hour). With the VPN active only one workstation can
>  login and then other workstations can't login anymore. It is as if
>  only one workstation is allowed to log in or use the tunnel at a time.
>
>  I think it could be his router allowing only one tunnel at a time, but
>  am not sure and we would appreciate some ideas.
>
>  TIA
>
>  - Thees Peereboom

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