Wes, I don't know where you heard this legend about IOS running on some other OS.... It is not true.
IOS is an operating system implemented directly on a hardware platform. There is no underlying operating system. Look at your IOS router for a "Boot Loader"; that's a small IOS kernel (and not a third party OS). PIX OS ran many, many, many years ago on top of a real time OS (Finesse) that was developed specifically for the hardware platform that the PIX used at that time. Today, the PIX OS runs directly on hardware (when you look at the actual PIX source code you sometimes see references to the old real time OS). You may be thinking of one of a number attempts (by third parties) to create a program that runs on Unix that can execute an IOS or PIX image. The latest attempt at something like that was the "IOU" (IOS On Unix) project. I don't know how far that ever got. This claim that either IOS or PIX is a version of Unix or running on Unix is becoming a kind of annual event. Maybe someone will claim that all Linux implementations actually runs on one copy of run-time Windows NT v4.0 next? Liberty for All, Brian At 08:15 AM 4/18/2002 -0700, [EMAIL PROTECTED] wrote: >Message: 6 >From: "Noonan, Wesley" <[EMAIL PROTECTED]> >To: "'Clifford Thurber'" <[EMAIL PROTECTED]>, > "'Mikael Olsson'" <[EMAIL PROTECTED]> >Cc: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]> >Subject: RE: Microsoft ISA server (Was: Re: Replacing my old PIX Classic) >Date: Wed, 17 Apr 2002 09:12:38 -0500 > >A sizable chuck of Cisco (don't know for sure on the PIX, but I know on >their routers) runs an OS behind the scenes that is called Xenix, XNS, ZNS, >or something along those lines (I really don't recall the actual name). IOS >runs on top of that (is my understanding, kind of like how Banyan ran on top >of Unix). My point was simply, if one is going to cast the "a firewall is >only as strong as the underlying OS" stone, they need to be prepared to cast >that stone at virtually every firewall out there. It is hardly a ISA >specific issue (heck, FW1 runs on MS doesn't it?). > >Wes Noonan >[EMAIL PROTECTED] >281-208-8993 _______________________________________________ Firewalls mailing list [EMAIL PROTECTED] http://lists.gnac.net/mailman/listinfo/firewalls
