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Remote access VPN  with IP address reservation

Posted on 2009-07-02
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Last Modified: 2012-05-07
Hello,

I'm trying to make Remote VPN user access with AD authentication and IP address reservation using Cisco ASA 5505 (ver 8.0.2).
AD authentication works fine with reconfiguration on AD servers ( IAS,RAS  service etc), but IP address reservation won't work. IP address reservation is done on DHCP servers (WIN2003) and important  because of the access  to perimeter networks through firewalls no matter if user is in the company or not.

This is what I already tried:
1. I routed VPN remote users to dhcp server (bellow):
...
tunnel-group RADIUS type remote-access
tunnel-group RADIUS general-attributes
 authentication-server-group RADIUS
 default-group-policy RADIUS
 dhcp-server 10.196.6.50
tunnel-group RADIUS ipsec-attributes
 pre-shared-key *
...
and user obtain an IP address from DHCP pool but not the one that I reserved for ?!
I tried with MAC address of machine and with PPP physical address but the same thing happens 'it doesn't see ' the reservation.

2.the other thing is to configure static IP address for Dial-in users on AD:
User->Properties ->Dial-In->Assign a static IP address ..
In this case I obtain the willing address but I have problem with routing:
Incorrect def.gtw (10.0.0.1) and subnet mask (/8)

I don't see what else I can do ..any suggestions ?
Thanks
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Question by:minicom
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5 Comments
 
LVL 28

Expert Comment

by:asavener
ID: 24765089
Create a separate remote access group and use an IP pool on the ASA to assign the address instead of DHCP.
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Author Comment

by:minicom
ID: 24770581
Did  you mean IP pool with one IP address for every user?  That means about 30-40 separate IP pools, not practical...
Im trying  to supply users laptops with the same IP address no matter if they are in LAN or if  they access remotely. Thats because the users would  have the same access privilege to perimeter networks in both cases - thats why I consider DHCP like option.
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LVL 28

Accepted Solution

by:
asavener earned 1500 total points
ID: 24772007
Sorry, but Cisco says using a VPN pool is the way to assign static IP addresses to VPN clients.

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080a7afb2.shtml
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LVL 28

Expert Comment

by:asavener
ID: 24772022
Actually, they used local user authentication and assigned an IP address to the user.
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Author Comment

by:minicom
ID: 24793694
I concluded that DHCP reservation won't work in combination with RAS VPN according to current situation. So I accept the suggested solution above.
Thank you.
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