RE: RES: RE: ISA Server and Outbound VPN
- From: "Greg Wright" <greg@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 12 Jun 2003 23:52:59 +1000
OK,
So far, here is what I have learned...
The problem exists between the VPN Dial-up entry and RRAS. If you stop
the RRAS services, the 'flapping' of the VPN connection ceases. As a
result of this, I am inclined to think that the nic card isnt to blame,
and that it's a configuration issue. Or a bug. I wonder if there were
any RRAS hotfixes applied to this system recently.
I like the post below, and will take a look at these configuration
options. I think its likely to be something similar to these fixes. It
certainly appears to be a painful resolution from a configuration
perspective.
My other solution is to go with PPPoE, which is a viable alternative.
Problem is the server failed to install RASPPPOE properly, and I have
now got two problems to resolve!
Thanks to all that posted. And just so you don't think im sponging, I
read over 60 VPN related posts today from the members of this list.
Seems VPN is quite a beast.
Regards and thanks,
Greg
-----Original Message-----
From: Tiago de Aviz [mailto:Tiago@xxxxxxxxxxxxxxx]
Sent: Thursday, 12 June 2003 11:29 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RES: RE: ISA Server and Outbound VPN
http://www.ISAserver.org
Hey Tom,
Remember that I had the same problem?
-In RRAS, you have to set only one of the VPN interfaces as persistent,
and other as demand-dial.
-The VPN interface must have the same name that the user being used to
connect to the remote server
-In the static routes in RRAS, the option "use this route to initiate
demand-dial connections" on the route that reaches the remote network
can only be marked on the same side that has persistent connection
marked.
This took care of the problem here.
Tiago de Aviz
IT Consultant
MCP-CNA-AIX-CCNA-CCDA
--------------------------------
www.softsell.com.br
tiago@xxxxxxxxxxxxxxx
--------------------------------
-----Mensagem original-----
De: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
Enviada em: quinta-feira, 12 de junho de 2003 00:07
Para: [ISAserver.org Discussion List]
Assunto: [isalist] RE: ISA Server and Outbound VPN
http://www.ISAserver.org
Hi Greg,
Is the ISA firewall creating a VPN client connection to the ISP? Or are
you just passing PPTP through the ISA firewall?
Thanks!
Tom
Thomas W Shinder
www.isaserver.org/shinder
ISA Server and Beyond: http://tinyurl.com/1jq1
Configuring ISA Server: http://tinyurl.com/1llp
-----Original Message-----
From: Greg Wright [mailto:greg@xxxxxxxxxxxx]
Sent: Wednesday, June 11, 2003 9:40 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: ISA Server and Outbound VPN
http://www.ISAserver.org
Hi Tom,
Its my wireless network (well, I run the thing anyway) and I was at the
site checking the radio quality. Sub 10ms pings for 25 minutes
yesterday.
The lower layers are fine. While the ping was running, the vpn
connection was reconnecting constantly, which indicated to me that it
was a VPN/ISA related problem. I also tested VPN connections from my
laptop over the same connection with no issue.
The VPN Server (as the ISP we hand off to) has not reported problems
with their end so I have to presume at this point its client side.
Thanks for the other idea's, I can and will try these. If these fail, im
going ot PPPoE!
Regards,
Greg
-----Original Message-----
From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
Sent: Thursday, 12 June 2003 12:16 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: ISA Server and Outbound VPN
http://www.ISAserver.org
Hi Greg,
First suspect is always layer 1: routers, cables, ISPs issues -- too
many people, including me, have VPN links stay up for hours or days
without problems. So, as long as your server is up to date, I have to
put ISA firewall related problems low on the list.
Try using L2TP/IPSec -- there are rumors, and nothing more than rumors,
that there's an issue with the control channel getting "stale", for want
of a better term. I don't know if it's a TCP protocol issue, or
something in the PPTP control command set. But sometimes changing to
L2TP helps.
Try switching from your high dollar Intel card with custom Intel drivers
to a cheapo Realtek or Linksys that has built in Win2k drivers. A number
of people have suggested that this has helped them too.
Make sure that there are no Remote Access Policies involved that direct
the servers or clients to drop the connection after "x" minutes of
inactivity.
Run a NetMon trace and catch the packets and see if anything interesting
happens right before the disconnect. Since the disconnect happens so
frequently, you won't have to wait long to get multiple examples.
HTH,
Tom
Thomas W Shinder
www.isaserver.org/shinder
ISA Server and Beyond: http://tinyurl.com/1jq1
Configuring ISA Server: http://tinyurl.com/1llp
-----Original Message-----
From: Greg Wright [mailto:greg@xxxxxxxxxxxx]
Sent: Wednesday, June 11, 2003 9:09 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] ISA Server and Outbound VPN
http://www.ISAserver.org
Hi all,
I havent been able to keep an eye on the mailing list for quite some
time, and I know that in the past there has been some ISA VPN related
posts. The reason I am posting this, is I have a customer that has a
highly configured ISA system, with configuration for an outbounf VPN
connection to their ISP for internet access, and then a couple more
oubound vpn's connecting the office to a central office in the US.
The internet VPN connection is constantly dropping and redialling its
connection. While I was onsite, the VPN never stayed up longer than 5
minutes.
Has anyone got any clues, recommendations or suggestions about issues
relating to VPN calls, ISA quirks etc?
I expect it will be just a matter of troubleshooting it, but I wondered
if anyone could give me a heads up before I get onsite.
Thanks,
Greg
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