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8.0

XP routing table changes kill Nortel Contivity VPN client

Asked by Jharper in Windows NT Networking

Tags: nortel, vpn, contivity, routing, client

Ok here's a tricky one.

We have been given the Nortel Contivity VPN client as a solution to access systems that are external to out network that we do not control. We also have an internal Cisco based site-to-site VPN that connects all of our offices together. Our corportate subnet is 10.10.10.0/24 and this problemed branch office subnet is 10.10.45.0/24. All of our internal systems work great.

OK here is the problem. A user on an XP machine will connect to the systems external to our netowrk without a problem using the Nortel Client. Once connected they can access the systems they need until XP changes its internal routing table. The Nortel Client automatically disconnects after a routing table change by design. These branch office machines (10.10.45.0/24) access several servers on the corporate network (10.10.10.0/24). One of the branch machines accesses say 10.10.10.23 for email it adds that address to its routing table and disconnects the Nortel VPN.

I thought I would get by with scripting a route add in the logon script that adds a route to each XP machine that looks like the following (route add 10.10.10.0 MASK 255.255.255.0 10.10.45.1 METRIC 1). Well as you can see below 10.10.10.18 was also added automatically to the routing table therefore, killing the VPN. If all of 10.10.10.0 traffic is already routed then why is XP routing each IP additionally? I have to find a way to stop this so I can keep the Nortel VPN up. Any suggestions?

===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 0f 1f da 7c 61 ...... Broadcom NetXtreme 57xx Gigabit Controller - Pac
ket Scheduler Miniport
0x3 ...44 45 53 54 42 00 ...... Nortel IPSECSHM Adapter - Packet Scheduler Minip
ort
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.10.45.1 10.10.45.60 10
10.10.10.0 255.255.255.0 10.10.45.1 10.10.45.60 1
10.10.10.18 255.255.255.255 10.10.45.1 10.10.45.60 1
10.10.45.0 255.255.255.0 10.10.45.60 10.10.45.60 10
10.10.45.60 255.255.255.255 127.0.0.1 127.0.0.1 10
10.255.255.255 255.255.255.255 10.10.45.60 10.10.45.60 10
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
224.0.0.0 240.0.0.0 10.10.45.60 10.10.45.60 10
255.255.255.255 255.255.255.255 10.10.45.60 10.10.45.60 1
255.255.255.255 255.255.255.255 10.10.45.60 3 1
Default Gateway: 10.10.45.1
===========================================================================
Persistent Routes:
None

Thanks!
JHarper

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XP routing table changes kill Nortel Contivity VPN client

Asked by Jharper in Windows NT Networking

Tags: nortel, vpn, contivity, routing, client

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