[olug] Subnet mask

Bob McCoy bob at mccoy.net
Sat Dec 13 21:58:18 UTC 2003


Back to the issue of where the default gateway is, it would have to be
on one of the addresses in the 65-94 range.  It really doesn't matter
where.  However, most people either put it at the top or the bottom end
of the range, and then for consistency sake use that standard across
multiple networks.

The reality is that the default gateway address is whatever's assigned
to your router.  Consumer devices just pick an address (usually at the
top or bottom) and everyone else has to fall in line.  Enterprise
networking usually follows some internally developed standard.

Good luck.  Bob.

-----Original Message-----
From: olug-bounces at olug.org [mailto:olug-bounces at olug.org] On Behalf Of
Craig Wolf
Sent: Saturday, December 13, 2003 3:37 PM
To: olug at olug.org
Subject: RE: [olug] Subnet mask

Got it!  So, 65-94 are the hosts and 95 is the broadcast.  Thanx for
helping me get the old noodle moving.  

Craig Wolf
Linux Web Server Support
Desktop/Network Specialist
402-894-6283

>>> bob at mccoy.net 12/13/03 15:34 PM >>>
No.  96 is outside the subnet range.  You wouldn't be able to reach it.
There is nothing magical or automatic about the default gateway.  It
could be assigned any usable address within the subnet (65 .. 94). 

-----Original Message-----
From: olug-bounces at olug.org [mailto:olug-bounces at olug.org] On Behalf Of
Craig Wolf
Sent: Saturday, December 13, 2003 3:24 PM
To: olug at olug.org
Subject: Re: [olug] Subnet mask

Googled and found this:
http://www.telusplanet.net/public/sparkman/netcalc.htm
Says that my mask is 255.255.255.24  
Broadcast address is 205.202.101.95
Gateway address is 205.202.101.96
Does this sound right?
Thanx!

Craig Wolf
Linux Web Server Support
Desktop/Network Specialist
402-894-6283

>>> cjwolf at mpsomaha.org 12/13/03 15:10 PM >>>
I am having a brain freeze and I cannot for the life of me figure this
out.  I have been given a range of numbers to use at my job and I cannot
figure out the subnet mask...Help!
The numbers are 205.202.101.64-205.202.101.93.  Class C address from
authority.  I know that by thinking about it, it is divided into 4
subnets, right? (30 numbers into 128 is 4 times+).  ugh.  My head hurts
today...

Craig Wolf
Linux Web Server Support
Desktop/Network Specialist
402-894-6283

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