TIP: Click on subject to list as thread! ANSI
echo: os2user-l
to: All
from: `Mark D. Overholser`
date: 2004-03-19 20:48:20
subject: Re: One for the TCP/IP wizards

Steve McCrystal wrote:

> I'm having a problem reaching a web site I need to use frequently. On
occasion, I can get on   
> immediately, but today I clicked on the URL before I left for work,
and when I came home 9   
> hours later Mozilla was still reportedly "contacting...." 
>  
> First question, is there any way to find out who (and/or) where this is: 
>  
> 10.49.32.1 
Ahh, Magic IP address.

Quoted from RFC1918 http://www.ripe.net/db/rfc1918.html> (one of many 
sources)

IP Blocks for Private Internets
The IP blocks


  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)

are reserved as private address space, specified in the RFC 1918. This 
means everybody can set up an internal network using addresses in these 
blocks, but packets originating from those addresses should never appear 
on the internet.

Consequently, the administrators of those internal networks are not 
obliged to register themselves with a whois database such as the RIPE 
database.

Thus, if you have received packets originating from these addresses, 
there is either a misconfiguration somewhere or the packets that you 
received contain a spoofed IP address, or they have been sent from 
within your own network.

RFC 1918 can be found at ftp://ftp.ripe.net/rfc/rfc1918.txt>

==========================================================

I know that My AT&T/COMCAST Cable Modem (really a Router, since it has 
two Network interfaces, with at least two IP addresses) has a 10.x.x.x 
address on the Cable Network side.  The Etheirnet/USB side can have 16 
or more Ip addresses assigned to it..




MarkO



>  
> Next, since TRACERTE shows this as the first hop on my way to the
needed site, and pinging it   
> shows lost packets as long as I'd care to wait, is there a way I can
somehow route around   
> whatever this site is? 
>  
> Thanks! 
>  



 
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