Cisco VPN Client: Idle timeout every few minutes--pls help

Hi all: I can make the VPN connection to work fine, but if I don't have network activity for something like 4 or 5 minutes, the VPN connection dies with error: Secure VPN Connection termindated by Peer. Reason 431: Configured Maximum Idle Time for Session Exceeded.

I am using a Cisco VPN Client 4.0.5(c) / WinXP Pro to connect to work from home. I have a wireless DSL router (Westel) from Verizon.

I am at my wit's end. The VPN folks claim all is well at their end, they do not have idle timout setting of few minutes, and that something is wrong at my end. They may be right, but I am disappointed that they can't help me troubleshoot at my end, if in fact the issue is at my end.

So far:

-Tried wired connection, instead of wireless

-Made sure I am using IPSEC over UDP instead of TCP (on VPN folk's recommandation)

-Added ForcedKeepAlives=1 to my profile

-Enabled IPSEC ESP (client) and IPSEC IKE (port forwarding) services in my home router (honestly don't know what they mean, just monkeying around)

-I even tried to run a bat script that simply pings a server, sleeps for 3 mins and goes at it again.

-I tried keeping a putty telnet session to a server open.

No matter what, unless I am actively using the browser or some appliation that generates network traffic, VPN connection is gone in a few minutes?

What on the earth is happening??

TIA.

PS: I just posted this in comp.dcom.sys.cisco without realizing this group is more appropriate, so my apologies to netizens.

Here's a chunk of log from my VPN client that I believe captures a timeout which may mean something to any of you gurus:

------------

654 09:27:15.375 07/14/06 Sev=Info/6 IKE/0x63000054 Sent a keepalive on the IPSec SA

655 09:27:25.375 07/14/06 Sev=Info/6 IKE/0x63000054 Sent a keepalive on the IPSec SA

656 09:27:35.375 07/14/06 Sev=Info/6 IKE/0x63000054 Sent a keepalive on the IPSec SA

657 09:27:45.312 07/14/06 Sev=Info/5 IKE/0x6300002F Received ISAKMP packet: peer = 198.74.13.200

658 09:27:45.312 07/14/06 Sev=Info/4 IKE/0x63000014 RECEIVING
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