| From: | The Hermit Hacker <scrappy(at)hub(dot)org> |
|---|---|
| To: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | "D'Arcy J(dot)M(dot) Cain" <darcy(at)druid(dot)net>, vev(at)michvhf(dot)com, vixie(at)vix(dot)com, pgsql-hackers(at)hub(dot)org |
| Subject: | Re: [HACKERS] cidr |
| Date: | 1998-07-22 16:35:34 |
| Message-ID: | Pine.BSF.3.96.980722122844.23582M-100000@hub.org |
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| Thread: | |
| Lists: | pgsql-hackers |
On Wed, 22 Jul 1998, Bruce Momjian wrote:
> OK, let me explain what I think Paul was saying. cidr is used for
> networks. You can use it for hosts by specifying /32. It is not the
> same as a netmask. For example:
>
> host 192.24.45.32
>
> Now, this is a host address. We can say its netmask is 255.255.255.0,
> or was can say it is part of network 192.24.45/24, which would allow you
> compute the netmask as 255.255.255.0. The problem is that you need the
> type to support cidr, hosts, and netmasks.
192.24.45.32/32 == 192.24.45.32:255.255.255.255 (single host)
192.24.45.32/30 == 192.24.45.32:255.255.255.252 (2 hosts)
192.24.45.32/26 == 192.24.45.32:255.255.255.192 (62 hosts)
Check out: http://www.min.net/netmasks.htm, it has *all* the translations
and appropriate netmasks associated with each CIDR...
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