[cisco-bba] Redirection to WWW determined by AVP

[Ian Henderson]

On Fri, 8 Jul 2005, Mark Tohill wrote:

> Thought that this would be moving towards Policy-Based-Routing, routing
> on source rather than destination. Is this a possibility, or is their a
> smarter way to implement this via RADIUS?

Assign the users you wish to redirect a block of RFC1918 address space
when they login. This address space is policy-routed to your 'playpen'
machine. This is how we do it for customers who are suspended or have to
change their dial number or similar.

access-list 98 remark *** Playpen
access-list 98 permit 10.100.0.0 0.0.255.255
!
route-map PLAYPEN permit 5
 match ip address 98
 set ip next-hop 10.13.102.1
!
route-map PLAYPEN permit 20

The next hop can either be your web server, or a tunnel towards a router
on the same subnet.

The only drawback to this approach is the customer has to disconnect to
get 'real' Internet access once they're done paying their bill/agreeing to
the T&C's/etc.

Other suggestions include:

- Use a VRF with a different default route. You'd still need the directly
  connected web server, or a tunnel to it, or MPLS to get traffic to go
  the right direction.

- Investigate Cisco's SSG stuff. I only know Marketing-speak about it, but
  apparently it does exactly what you're after. Multiple services are
  defined ('Internet', 'Playpen', 'Free Gaming only', etc). RADIUS
  authenticates the user when they want to access each service (defined by
  IP address or interface) giving access based on business rules. So if I
  understand the whole thing correctly, you could put all users by default
  in the 'Playpen' service, then only let the signed up customers access
  anything else.

- If you already transparently cache users, intercept them here using an
  LDAP lookup or similar.

Rgds,




- I.

--
Ian Henderson, CCIE #14721
Senior Network Engineer

iiNet Limited
Chime Communications Pty Ltd