RE: [OT] Network question

["Sullivan, Glenn" <gsullivan@xxxxxxxxxxxxxx>]

Um, you guys are agreeing with each other.

192.168.0.0/16 means "All networks where the first two octets of the
IP
address are 192.168" because the /16 means "The leading 16 bits
identify
the 'network address' and the remaining bits identify a host on the
given network."

Had he written 192.168.0.0/24, you would have a point, as that would
mean "All networks where the first three octets are 192.168.0"

HTH,

Glenn Sullivan, MCSE+I MCDBA
David Clark Company Inc.
-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
Of Bill Kearney
Sent: Friday, January 27, 2006 9:45 AM
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] [OT] Network question


> Only the Class C address of 192.168.0.0/16 (or Class B of 10.0.0.0/8)
> is for local, non-routable use.

Err, no, the entire range in 192.168.x.x is available for
off-the-internet addressing.  So it's perfectly fine to use
192.168.1.0/255.255.255.0 as a private subnet.  In fact, it's a VERY
good idea NOT to use 192.168.0.0 for a private network as FAR too many
devices come with that setup as their default network.  If/when you
eventually try connecting in from another network it becomes problematic
if they're both using the same subnet!  Pick something higher like
192.168.13.0 or 192.168.121.0 or whatever.  There's no guarantee that
won't get used but it'll certainly be less likely.  Same thing goes for
the 172.16.0.0 and 10.0.0.0 ranges.  There you can use anything from
172.16.0.0-172.16.255.0 and 10.0.0.0-10.255.255.255.  They're just
expected to use different subnet masks.  Be careful about using Class-A
and Class-B subnets as some low-end devices don't always allow
themselves to configured for them.  (They should but don't always get it
right).

-Bill Kearney