Re: State of security technology for the enterprise

Stateful is typically about 5-tuple flow tracking and maybe some
handful of protocols that need alternate ports (FTP is usually the
qualifier for someone to be stateful) and DPI is typically about the x
odd protocols that are decoded "enough" to claim deep.

And it makes a nice story,

K.

On Thu, Apr 30, 2009 at 6:19 PM, Paul D. Robertson <[email protected]> wrote:
> On Thu, 30 Apr 2009, Marcus J. Ranum wrote:
>
>> ...And nobody has ever done an adequate job of explaining what is
>> stateful about SPI or particularly "deep" about DPI.   As one of those
>
> Oh, the stateful part was explained pretty well- as were the state tables,
> it was the "inspection" part that was all over the map in SPI just like
> in DPI...
>
>> obnoxious guys who always did everything at Layer 7, it seems more
>> like an argument about who's the tallest kid in the shallow end of
>> the pool.
>
> I get to have a proxy conversation with a bank tomorrow, because *all*
> their literature for their ACH service requires "unrestricted Internet
> access" with (at least according to the manuals, no place to even put a
> proxy for the HTTS or FTP methods.)  *sigh*
>
> Paul
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