This post from Lisa Napier should clear things up:
http://www.geocrawler.com/archives/3/90/1999/9/0/2674885/
Dennis
Enno Rey wrote:
>
> Hi,
>
> > IOS". It is an independent OS written specifically for the PIX and
> > security.
>
> You mean, the PIX's OS was designed from the scratch? Without any input from
> anything? Then they got pretty good developers at XYZ [the company the PIX
> was originally designed by, before Cisco bought them]...
> This is a discussion constantly coming back to the list (Paul, you can add
> this to your auto-poster...) and each time, after two weeks I forget the
> results... could anybody with the necessary insight plaese clarify the
> question:
> is the PIX's OS based on BSD [that's what I assume... my 2 cents...] or
> based on XYZ [put in OS of your choice] ... or something completely
> different ... or something created by mossad or...
> I'm too lazy to search the archives right now...
>
[snip]
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