My apologies, that was a little harsh, I thought your answer was a little
too vague. In hindsight it certainly wasn't wrong. I like that Doyle
description you cited, it is quite succinct. You are also right in that my
post was a little misleading, I should have gone to bed instead of trying to
think at that time of the morning.
Hope you get some ZZZ's tonight!
----- Original Message -----
From: Casey Fahey <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, August 23, 2000 8:36 AM
Subject: Re: ip classless ?
> Wrong? Me? Golly, I had trouble sleeping last night after reading
that...!
> ; )
>
> Your definition is almost word-for-word what is reflected in the CCO docs
or
> a textbook. The docs say what the entry does, but say little about how or
> why, which was the essence of the original question. So, I wanted to
frame
> the overall concept in a way that is more easily understood.
>
> I take for granted that most folks have gone to CCO to look at the
> definition there, and did not feel it was neccesary to copy and paste
that.
> What we REALLY wanted to do is look under the hood and achieve an
> understanding as to WHY, and how it might impact our network design
> decisions. (Like, don't use RIP or IGRP...? :) )
>
> Just for grins, the definition I prefer, from Jeff Doyle's book, pp765 "IP
> Classless : Enables classless route lookups so that the router can
forward
> packets to unknown subnets of directly connected networks."
>
> Beyond this, I agree that your statment is correct, but somewhat
incomplete
> and therefore misleading. The meat of the issue IMO is the paradigm shift
> between Classful and Classless address space, routing and the
ramifications
> when it comes to early distance-vector routing protocols.
>
> Have a good one,
>
> Casey
>
> >From: "whatshakin" <[EMAIL PROTECTED]>
> >Reply-To: "whatshakin" <[EMAIL PROTECTED]>
> >To: <[EMAIL PROTECTED]>
> >Subject: Re: ip classless ?
> >Date: Wed, 23 Aug 2000 00:27:27 -0700
> >
> >This is wrong amigo.
> >
> >The 'ip classless' command is used when configuring default routes. It
is
> >used because when you create a default route on a router it gets
advertised
> >as 0.0.0.0 in addition to the default network. When a router recieves
the
> >advertised default route it will forward packets to a destination which
> >does
> >not appear in its routing table. Specifically you need to use the 'ip
> >classless' command when using IGRP and EIGRP because they only advertise
> >the
> >network you configured on them. If you do not use this command to enable
> >the default path to be used for non-connected subnets of the same major
> >classful network, the packets will be dropped at the router.
> >
> >
> >----- Original Message -----
> >From: Casey Fahey <[EMAIL PROTECTED]>
> >To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> >Sent: Tuesday, August 22, 2000 8:48 PM
> >Subject: Re: ip classless ?
> >
> >
> > > Ah yes, classful addressing. Blast from the past...
> > >
> > > I am assuming you are aware of the classes of IP addresses, and how
a
> > > class A address has a first octet of 1-127, etc..
> > >
> > > Well, what IP Classless means is that the router *does not* assume
that
> >an
> > > IP address with a first octet of 1-126 is a /8 address, 128-191 a /16
> > > address, 192-223 a /24 address and so forth.
> > >
> > > Sound a bit archaic? Hmm... So are IGRP and RIP. ; )
> > >
> > > Your question is kind of tough to answer directly, since you do not
need
> >to
> > > use IP Classless unless you need to break, say a 10.x.x.x network into
> >/24
> > > subnets. If you don't include IP Classless, the router will assume
the
> >mask
> > > is instead /8 and things will get weird...
> > >
> > > HTH,
> > >
> > > Casey
> > >
> > > >From: "Yee, Jason" <[EMAIL PROTECTED]>
> > > >Reply-To: "Yee, Jason" <[EMAIL PROTECTED]>
> > > >To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
> > > >Subject: ip classless ?
> > > >Date: Tue, 22 Aug 2000 22:07:51 -0500
> > > >
> > > >hi ,
> > > >
> > > >Anyone knows why when we use RIP or IGRP routing protocols and we
have
> >a
> > > >default network command entered , we need to include ip classless?
> > > >
> > > >Any form of input will be greatly appreciated
> > > >
> > > >
> > > >thanks
> > > >
> > > >
> > > >Jason
> > > >
> > > >___________________________________
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