On Jun 30, 2014, at 4:53 PM, Tony Wicks <t...@wicks.co.nz> wrote:

> From experience (we ran out of IPv4 a long time ago in the APNIC region) this 
> is not needed,

I've seen huge problems from compromised machines completely killing NATs from 
the southbound side.

> what is needed however is session timeouts. 

This can help, but it isn't a solution to the botted/abusive machine problem.  
They'll just keep right on pumping out packets and establishing new sessions, 
'crowding out' legitimate users and filling up the state-table, maxing the CPU. 
 Embryonic connection limits and all that stuff aren't enough, either.

----------------------------------------------------------------------
Roland Dobbins <rdobb...@arbor.net> // <http://www.arbornetworks.com>

                   Equo ne credite, Teucri.

                          -- Laocoön

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