[cisco-bba] Distinct IP over L2TP/VPDN

Oliver Boehmer (oboehmer) oboehmer at cisco.com
Thu Jul 14 04:49:19 EDT 2005

> Problem:
> DSL users are allocated user at domain details and some (on request) are
> given fixed IP's. These are provided via our RADIUS on connection.
> Occasionally users are given the same static IP's ( by mistake J ).
> When this happens, we see identical next-hop WAN IP's via a 'show
> users'. Neither user has connectivity since there is major packet
> loss. Understandable.     
> Question:
> Is there any way we can change this behaviour on router so that the
> first user on particular IP works, subsequent users who connect  on
> same IP have no connectivity at all?  

No, there is nothing you can do about this if you need to safeguard
against incorrect Radius profiles.. There is no logic in IOS which
prevents you from assiging the same IP address to two virtual-access


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