RE: help - can someone explain this to me?

From: Burton M. Strauss III (BStrauss@feliscatus.org)
Date: 10/29/01 

From: "Burton M. Strauss III" <BStrauss@feliscatus.org>
To: "security-basics" <security-basics@security-focus.com>
Subject: RE: help - can someone explain this to me?
Date: Mon, 29 Oct 2001 11:57:53 -0600
Message-ID: <HBEBKGPKAEJLGMLAANAOGEDODFAA.BStrauss@feliscatus.org>

The RFC 1918 address are not supposed to be routed on the Internet.

Within a network, you can do what ever you want with them.

So an ISP that adopts 10. addressing among it's users may (doesn't have to)
route the 10. block among it's users. That is, customer one could be
assigned 10.1.x.y and customer two assigned 10.2.a.b and it's totally
unspecified if these two can see each other. Or the only way they can see
each other is through their publicly exposed addresses.

NB: As the term was used back then, the capital I internet is what we today
call "the [iI]nternet" or the "[pP]ublic [iI]nternet". In older documents,
you will occasionally find small i internet references, meaning a network
that inter-connects networks. Today we call those LANs or MANs etc. and use
"internet" to mean "Internet".

-----Burton

-----Original Message-----
From: Andrew Blevins [mailto:ABlevins@arrowheadgrp.com]
Sent: Friday, October 26, 2001 5:02 PM
To: 'scott [gts]'; security-basics
Subject: RE: help - can someone explain this to me?

That these reserved addresses can't be routed I don't think is entirely true
(but I'm not a network spec. either! :-) . I have seen many ISP's use 10.
addresses for their own routers, and for all intent's and purposes "The
Internet" includes some ISP networks (cable, DSL). It is very possible that
someone is spoofing those 10. addresses, and they are still being routed
through to your box. many times a DoS contains many spoofed source
addresses.

Andrew Blevins
Arrowhead Help Desk
1-800-669-1889
x. 8569

Relevant Pages

  • drone armies C&C report - July/2005
    ... 3356 LEVEL3 Level 3 Communications ... 3491 BTN-ASN - Beyond The Network A ... 3801 MISNET - Mikrotec Internet Ser ... 15857 DIALOG-AS DIALOG-NET Autonomuo ...
    (Bugtraq)
  • Masquerading problem... can you help?
    ... server to masquerade a simple network and allow access to ... My server uses a modem to dial the internet. ... `SuSE-FW-DROP-DEFAULT' ...
    (comp.os.linux.security)
  • Re: U.S. as Traffic Cop in Web Fight
    ... Internet providers to treat all Web traffic equally, ... Digits: What Is Net Neutrality? ... AT&T cited network congestion concerns. ... Phone companies including AT&T have argued that they can live with the FCC's ...
    (talk.politics.guns)
  • U.S. as Traffic Cop in Web Fight
    ... Internet providers to treat all Web traffic equally, ... Digits: What Is Net Neutrality? ... AT&T cited network congestion concerns. ... Phone companies including AT&T have argued that they can live with the FCC's ...
    (talk.politics.guns)
  • Re: Verizon rules the World? Or just the U.S.?
    ... Internet these days? ... network can now branch anywhere, and network data transfer is a piece ... Nearly all computer science departments and many private computer ... all these networks have gateways to the NSF backbone.) ...
    (rec.arts.mystery)