Cheap LSN/CGN/NAT444 Solution

Skeeve Stevens skeeve+nanog at eintellegonetworks.com
Tue Jul 1 00:03:40 UTC 2014


Roland, what methods are the easiest/cheapest way to deal with this?


...Skeeve

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On Mon, Jun 30, 2014 at 8:12 PM, Roland Dobbins <rdobbins at arbor.net> wrote:

>
> On Jun 30, 2014, at 4:53 PM, Tony Wicks <tony at 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 <rdobbins at arbor.net> // <http://www.arbornetworks.com>
>
>                    Equo ne credite, Teucri.
>
>                           -- Laoco├Ân
>
>


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