[KLUG Members] IP Routing and other issues...

[Peter Buxton]

On Tue, Dec 03, 2002 at 11:10:21AM -0500, Bruce Smith wrote:

> > Well, unfortunately, for some reason, I seem to do things the hard
> > way.  What I mean is, the windows machines all have a 198.200.194.*.
> > naming convention and the linux machines have a 192.100.115.*.
> > naming convention.  Since both use the same subnet mask,
> > theoretically, I should be able to ping between the two.  But, that
> > doesn't seem to be the case.  

> Use:  192.168.x.y   Pick any "x" and keep it the SAME for ALL of your
> computers.  Vary "y" from computer to computer.

If you truly want to mess with large numbers, make your netmask
255.255.0.0 and assign hosts to 

172.16.100.x
172.16.200.x  

where 172.16.[0-254].[1-255]

But your worse problem (aside from Footnote 1) is your netmask doesn't
match your IP assignments. (Ignoring for the moment your DNS, or lack of
it, and your MS browsing stuff.) In the following situation:

Host1: 192.168.100.1
Host2: 192.168.200.1

if both hosts have a netmask (or, more accurately, a subnetmask) of
255.255.255.0 then each host thinks the other is on a separate physical
network connected by a router/gateway... which you probably don't have.

You're confusing the nice computer. :) 





Footnote 1:

192.168.x.x is a proper private subnet. 192.200.x.x and 192.100.x.x are
pubic Internet addresses:

http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc1918.html

    3 Private Address Space

    The Internet Assigned Numbers Authority (IANA) has reserved the
    following three blocks of the IP address space for private
    internets:

         10.0.0.0        -   10.255.255.255  (10/8 prefix)
	 172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
	 192.168.0.0     -   192.168.255.255 (192.168/16 prefix)

    We will refer to the first block as "24-bit block", the second as
    "20-bit block", and to the third as "16-bit" block. Note that (in
    pre-CIDR notation) the first block is nothing but a single class A
    network number, while the second block is a set of 16 contiguous
    class B network numbers, and third block is a set of 256 contiguous
    class C network numbers. 

-- 
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Though nothing is wasted, everything is spent. -- Annie Dillard