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Backup demand-dial connection - 9.Mar.2003 8:58:00 AM

yassin

Posts: 22
Joined: 31.Dec.2002
From: U.A.E
Status: offline

Hi all
I've a remote site connecting to the head office through a VPN connection after dialling to the Internet using a 128K ISDN modem. The two connections are dial-on-demand connections.
I've an ISDN modem installed in the HO RRAS server for incoming connections.
I want the remote site to directly dial to the HO instead of dialing to the Internet if there is a problem in the Internet connection or the VPN connection. How to do that?

Best Regards,
Yassin

Post #: 1

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RE: Backup demand-dial connection - 9.Mar.2003 6:00:00 PM

tshinder

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline

Hi Yassin,

You should be able to create a second demand dial interface that isn't dependent on a primary connection. However, I don't think I would do this on an ISA Server machine.

HTH,
Tom

(in reply to yassin)

Post #: 2

RE: Backup demand-dial connection - 10.Mar.2003 5:54:00 AM

yassin

Posts: 22
Joined: 31.Dec.2002
From: U.A.E
Status: offline

Hi Tom,
Thanx for the reply.
I can create a second demand dial. But here is the sequence of my connections: if any backet destination to the HO, first a dialup connection to our ISP will be established, then a VPN connection to our HO. The problem here I've one ISDN line. If VPN connection failed, the first dial up connection to the ISP will still be there. So the line will be busy, for half an hour (my time out setting) hence I can't have a second interface using the same line to dial directly to the HO. (I beleive scripting might solve the problem).
If it's not recommended, then how to create a failover connection to maintain availability.

Thanx again TOM, you are a great help.

Yassin

(in reply to yassin)

Post #: 3

RE: Backup demand-dial connection - 10.Mar.2003 4:15:00 PM

tshinder

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline

Hi Yassin,

Scripting may indeed be the answer, but I haven't really studied this scenario before, so its hard for me to give an intelligent analysis [Smile]

The problem is that the ISA Server component uses the dial-up entry connectoid while the RRAS demand dial interface is unaware of the connectoid. You'll have to configure the connectoid to never redial so that it doesn't conflict with the demand dial interface.

HTH,
Tom

(in reply to yassin)

Post #: 4

RE: Backup demand-dial connection - 11.Mar.2003 8:49:00 AM

yassin

Posts: 22
Joined: 31.Dec.2002
From: U.A.E
Status: offline

Hi Tom:
The dial up connection is another demand dial interface "sorry for the confusion". So I've two demand dial interfaces, one using the ISDN line to my ISP and the other interface is the VPN to my HO.

What I need exactly is the following logic:

If the demand dial to my ISP is successfull THEN >>

Try the VPN demand dial interface. >>
If the VPN failed, THEN >>
Disconnect the previous connection and use a third demand dial interface directly to my HO.

If the demand dial to my ISP failed TEHN >>