CIDR - networking

[Kihara Muriithi]

> Then again, given the scarcity of non-CIDR systems these days, why are
> you so concerned with it?  In the 12 years I've been working with IP,
> I've never seen anything but CIDR.  Address classes have been obsolete
> for years.
  That sentence has homed at the problem. Its that I can't tell how a
class address look like. My understanding was that, if you see a
netmask like 255.0.0.0 or 255.255.0.0 on what they were calling A and
B respectively, then that is class system. That is how my box is
currently set up. ie 192.168.1.3  255.255.255.0
  I thought CIRD carry a mask like 255.128.0.0? ie no clean 255 to 0
transition. How would I identify a non-CIDR if I see one? I am very
sorry for my ignorance by the way

William

On 1/8/06, James Knott <james.knott-bJEeYj9oJeDQT0dZR+AlfA at public.gmane.org> wrote:
> Kihara Muriithi wrote:
> > Hi
> >  Thanks for the response. I suspected most modern host will work with
> > CIRD, but haven't seen it used widely. Since it has been over 10 years
> > since CIRD came to existance, this should not be the case and I
> > wondered whether there was a technical reason behind it and hence the
> > email
> >  Now Knott, since you have experience with this set up, have you came
> > across a problem that you can attribute to CIRD misconfiguration? What
> > were the symptoms, just in case I ever happen to come across that
> > issue? Allen mentioned an instance where CIRD can not be used and this
> > may lead to a situation where classed and classless system network.
> >  One last thing, am I correct to assume one identify whether a host is
> > configured with class or classless system by using "ifconfig" and
> > "route" commands and then looking at the netmask?
>
> As I understand it, if you have a subnet mask where you can specify how
> many bit to use, you have CIRD.  As I don't ever recall working with a
> non CIDR system, I can't speak to any problems caused by it.  Bear in
> mind, that any CIDR system can be configured to behave like a non CIDR
> system.
>

>
>
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