Nat'd client behind linksys to VPN 3015

Hi,

I've just inherited a Cisco VPN Concentrator & below is the version:
Bootcode Rev: Cisco Systems, Inc./VPN 3000 Concentrator Series Version
2.5.Rel Jun 21 2000 18:57:52
Software Rev: Cisco Systems, Inc./VPN 3000 Concentrator Version 3.5.2.Rel
Feb 14 2002 12:10:21

Recently we just setup a virtual office at McLean, Virginia, US.
Our admin there has successfully setup a Linksys wireless router so everyone
can surf internet.
The Linksys is plugged to the only RJ45 socket on the wall.

However, only 1 user at a time can VPN (they use Cisco VPN Client v.3.6.3
and 4.6) to our office here in Singapore.
I've looked at:
Cisco Document ID: 5753
(www.cisco.com/en/US/products/hw/vpndevc/ps2284/products_tech_note09186a00800946af.shtml)
- I can't find 'IPSec through NAT' under Configuration->User
Management->Groups, then Modiy Group, then IPSec tab.
I did find IPSec over UDP and IPSec over UDP Port under 'Mode Config'
instead of IPSec tab. Are they the same?
- I also can't find 'NAT Transparency' under
Configuration->System->Tunneling Protocols->IPSec.

I enabled IPSec over UDP & IPSec over UDP Port (use port 10000), and on the
client tick on "Enabled Transparent Tunneling" + IPSec over UDP.
Yet, still only 1 user can connect at a time.

Anything I missed?
THANK YOU in advance.


regards,
Sur

 

I believe you need 3.6.? to do NAT-T.

Cheers!