RE: ISA 2000 & VPN

  • From: "Ray" <rdzek@xxxxxxxxxxxxxxx>
  • To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
  • Date: Mon, 16 Aug 2004 07:18:57 -0700

I would look closely at your DSL router.  One of the little nasty secrets of
dsl routers is that while they support pptp pass-through, they don't say
anywhere in their documentaion how many encrypted tunnels they can handle.
We recently experienced this problem at a conference were we were using a
universities network to establish a sort of WAN back to our offices.  We had
several machines behind a DSL router to give us some seperation from the UC
network.  We were just VPN'ing from the individual PC's we were using for
registration, inventory, etc back to our ISA 2000.  We had a very hard time
getting anymore than 3 PC's to connect at a time.  I switch to a from a
D-link to a Linksys and it worked fine.

If you need to keep multiple machines all connected, you may think about
placing a isa 2004 box at the far end and let that be your router.  That was
the direction we were headed, but we simply ran out of time and had to go
with the dsl router.  Since it was a temporary need, it worked fine.  But in
the future I think the isa 2004 box would have been more robust.


Ray Dzek
Network Operations Supervisor
Specialized Bicycle Components
PH:  408-782-5420
FX:  408-782-5421 

-----Original Message-----
From: Paul Crisp [mailto:PCrisp@xxxxxxxxxxxxxxxxx] 
Sent: Monday, August 16, 2004 5:41 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] ISA 2000 & VPN


http://www.ISAserver.org

Can someone answer this for me?

Can ISA 2000 accept multiple VPN connections from the same IP or same MAC
address ?

I am trying to pinpoint where my problem is. I have mutiple people VPN'ing
into our system without a problem, accept for two machines. I basically have
a warehouse where we have two PC's connected to an ADSL router and only one
machine will ever connect to the VPN. The other either times-out saying 'the
server did not respond in a timely fashion' or just does not find the ISA
server at all. Both machines can browse the Internet fine !

Paul Crisp
Snr Network Support Analyst
t: 020 7 827 5201
f: 020 7 827 5266


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