[Madlug] Question about Local IP#s

Matthew Callaway matt at securepipe.com
Fri Feb 11 10:39:51 CST 2000


If you want all the specifics, check out RFC1918

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

Matt

Jon Eklund wrote:

> Bill,
>
> According to the bible (ORA's _TCP/IP Network Administration_) You have
> the choice of the following:
>
> 10.0.0.0 (10.xxx.xxx.xxx) (Class A Block)
>
> 172.16.0.0 to 172.31.0.0 (consecutive Class B Blocks)
>
> 192.168.0.0 to 192.168.255.0 (consecutive Class C Blocks)
>
> yes, these may be used interchangeably.  and the 127.0.0.0 block is
> reserved for "localhost" -- loopback address.  You can't use 'em for other
> computers on the network or pretty much everything will get screwed up.
>
> I have a question for everybody, though -- is there really any difference
> between
> calling "192.168.0.0 to 192.168.255.0" consecutive Class C's or calling it
> a single
> Class B?  Or is that just a holdover from before submasks were used?
>
> Jon
>
> At 09:25 PM 2/10/00 , Bill Farina wrote:
> >I've worked on a number of networks and have run into 3 sets of IP#s that
> >are used locally.  I was wondering if anyone knows the difference between them?
> >
> >10.X.X.X - I've seen this used for a LAN in a large company.
> >
> >127.0.0.X - Used for localhost.  Is this just used in a single machine or
> >can this block be used all across a LAN?
> >
> >192.168.0.X - This was used in a LAN in a proxy situation.
> >
> >I suppose that my question would be... are all of these blocks
> >interchangeable or are the specific blocks designated for specific purposes?
> >
> >
> >
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>
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