[c-nsp] Static ip address info

[Stephen J. Wilcox]

On Wed, 16 Nov 2005, Mark Tohill wrote:

> I sent this originally to BBA List. Hope I'm not off-topic.
> 
>  
> 
> We have DSL users coming in on 7204VXR's over L2TP VPDN acquiring static
> IP's, both gateways and small subnets (/29's for example).
> 
>  
> 
> We suspect a lot of our users are not using their /29's and are NAT'ing
> etc. on their gateway addresses.
> 
>  
> 
> Is there any relatively easy way of finding out this sort of
> information?
> 
>  
> 
> Ideas spring to mind are ACL's, gleaning info from CEF (???), ip
> accounting....
> 
>  
> 
> Has anyone ever come up against same problem or has an idea how this
> might work?

export netflow, look at source addresses coming from the l2tps might be easiest

Steve