tcp/ip addressing

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From - Fri Dec  1 06:33:28 2000
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Newsgroups: comp.unix.sco.misc
From: bill@wjv.com (Bill Vermillion)
Subject: Re: TCP/IP connectivity problem, SCO 5.0.5 can't ping router
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In article <20001130204615.H12590@jpradley.jpr.com>,
Jean-Pierre Radley  <jpr@jpr.com> wrote:
>Jeff Liebermann propounded (on Thu, Nov 30, 2000 at 05:12:19PM -0800):
>| Incidentally, 192.168.1.2 for a router is a bad choice.  If you can,
>| re-assign the router IP to 192.168.1.254.

>Why?

Good question.  I always place the router at the first address above
the base network.  If you work with multiple routers for several
sites then you always know the router will be one above the lowest
number in the address block.  It might not make much difference if
you stick in the private addresses.

Another reason on the bigger routers is that when running subnets,
if you are using windows machines you can point the default route
at the bottom of the address block even if the subnet for the PCs
is above that.  By that I mean that if you have a subnet of 
x.x.x.64 to x.x.x.127, the PCs can have their default set to
x.x.x.1.  However if you bring Apples into the mix their default
gateway must be within the subnet. [can you see where MS has done
things non-stanard].  At that point I just put a secondary IP on
the x.x.x.1 IP in the block the Apples are in.

If you start running more than one ethernet - many routers have
more than one - then your job becomes much easier because there is
a consistancy in numbering.

Those are just the way I do it because it works for me.

On a site with multiple offices everything is the same starting
point.  All the remote printer IPs start at .50 [no reason for that
number - but it was handy].  Since every site has at least two
printers they will always be .50 and .51, and if more go up from
there.

Using the 192.168.x.x network, then each city has the third quad
for itself.  192.168.10.x would be A, and B would be 11.x, etc.

This means that city G's second printer would be x.x.16.50.  You
only have to memorize the third quad against the matching city.


th

-- 
Bill Vermillion -   bv @ wjv . com

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