[cisco-bba] Multiple IP Addresses

Robert Blayzor rblayzor.bulk at inoc.net
Mon Apr 14 08:17:31 EDT 2008

On Apr 14, 2008, at 8:05 AM, Dermot Williams wrote:
> Quick, possibly stupid question for you all. If I want to assign  
> multiple addresses to a CPE using PPP(oE), can I use RADIUS  
> attributes? Or is the only way to achieve this by assigning a single  
> IP address using the ‘Framed-IP-Address’ attribute and then adding a  
> static route for one or more additional addresses to our LNS  (with  
> a next-hop of the RADIUS-assigned address)?
> I’m 99.9% certain that I’ve just answered my own query but I’d  
> appreciate some feedback (I *crave* validation :P )

Couple of ways you can do this.

You can send a Framed-IP-Address and a subnet mask to something other  
than all ones.  Although only the device connecting PPPoE would be  
able to use the different IP addresses, but would work for things like  
static NAT's, etc.

Or you can just do a Framed-Route attribute and send a subnet to the  
CPE connecting via PPPoE, ie: a router.

In most cases you don't have to assign a Framed-IP-Address and a  
Framed-Route, the router is smart enough it can use a dynamic IP from  
a pool and route it to the device connecting.

Robert Blayzor, BOFH
rblayzor at inoc.net

Mac OS X. Because making Unix user-friendly is easier than debugging  

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