CIDR - networking

Kihara Muriithi william.muriithi-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org
Tue Jan 10 16:22:54 UTC 2006


Hi,
 Thanks a lot. The thread cleared my mis-understanding. I am now sure
I have never come across a class based address, since they all had a
netmask. I just happened to have seen only  255.0.0.0, 255.255.0.0 and
255.255.255.0 which lead to the confusion.

William

On 1/10/06, Andrew Hammond <ahammond-swQf4SbcV9C7WVzo/KQ3Mw at public.gmane.org> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 8-Jan-06, at 23:37, Kihara Muriithi wrote:
>
> >> 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
>
>
> Class based networks have implicit netmasks based on the IP. Anywhere
> you see an explicit netmask, you have CIDR.
>
> For example, 10.0.0.0 is a class based network. 10.0.0.0/8 is the
> same network but with CIDR notation.
>
> You can find the breakdown of classes and netmasks in the RFC.
>
> http://rfc.net/rfc791.html#p24
>
> __________________________________________________
> Andrew Hammond    416-673-4138    ahammond-swQf4SbcV9C7WVzo/KQ3Mw at public.gmane.org
> Data Services Group Manager, Afilias Canada Corp. Ltd.
> CB83 2838 4B67 D40F D086 3568 81FC E7E5 27AF 4A9A
>
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.1 (Darwin)
>
> iD8DBQFDw9cSgfzn5SevSpoRAse9AKC64DnegeiaBBymftNPvVllKf3anACdGMSy
> TVuUDHtx0ZaqeYJycIJKPCU=
> =1xzG
> -----END PGP SIGNATURE-----
> --
> The Toronto Linux Users Group.      Meetings: http://tlug.ss.org
> TLUG requests: Linux topics, No HTML, wrap text below 80 columns
> How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml
>
--
The Toronto Linux Users Group.      Meetings: http://tlug.ss.org
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml





More information about the Legacy mailing list