[Dshield] Another simple question...

Gary Garrison garyg at fbtc.net
Sun Oct 28 18:46:07 GMT 2001


Josh,

The numbers after the slash in an IP address indicate where the address into
network and host parts. It's called the subnet mask, and is also represented
in the form of a dotted decimal ip address with zeroes in the host part.

Gary

-----Original Message-----
From: dshield-admin at dshield.org [mailto:dshield-admin at dshield.org]On
Behalf Of Josh Tolley
Sent: Saturday, October 27, 2001 6:47 PM
To: dshield at dshield.org
Subject: [Dshield] Another simple question...


What does the /8, /12, etc. below mean?  I assume subnet, but having
only used 4 octet notation for subnets, I don't know how to translate
it.

Josh Tolley

<snip>
The reserved-for-private-use netblocks should be blocked in *both
directions* (in and out, source and destination) at your boundary:
10.0.0.0/8
172.16.0.0/12
192.168.0.0/24
</snip>


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