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the /number showes you the netmask. technicly it is the number of "1"'s in
the netmask starting from the left (if the netmask was shown in binary).
common examples are
/0 = 0.0.0.0 = all IP addresses
/8 = 255.0.0.0
/16 = 255.255.0.0
/24 = 255.255.255.0
/32 = 255.255.255.255 = one machine
this is most commonly used when you have an "odd" netmask for
subnet/supernets
A couple expamples That I use
/23 - 255.255.254.0 = 2 class C networks refered to as one network,
simplifies rules and gaines use of 2 IP addresses (the .0 and .255 in the
middle of the range are not special addresses)
/30 = 255.255.255.252 = 4 IP addresses, used for point-to-point links (one
address is the network address, one for each end of the link, and one
broadcast address)
David Lang
On Wed, 9 Jun 1999, Jules wrote:
> Date: Wed, 9 Jun 1999 19:12:32 +0800 (MYT)
> From: Jules <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: IP significant bit addresses
>
>
> This is a newbie question, I've checked almost every resource available to
> me, but I still don't really grasp this concept, so if anyone can clarify
> it for me, I'd be grateful.
>
> How does one read addresses like 172.168.10/24 or 172.16.51.50/32 ?
>
> In particular, what does the slash signify what does it do in the above
> case(s).
>
> If this is anywhere off topic for the list, personal e-mail will do too.
> Thanks in advance.
>
> Cheers!
> -J
>
> -
> [To unsubscribe, send mail to [EMAIL PROTECTED] with
> "unsubscribe firewalls" in the body of the message.]
>
"If users are made to understand that the system administrator's job is to
make computers run, and not to make them happy, they can, in fact, be made
happy most of the time. If users are allowed to believe that the system
administrator's job is to make them happy, they can, in fact, never be made
happy."
- -Paul Evans (as quoted by Barb Dijker in "Managing Support Staff", LISA '97)
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-
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