Re: IPv4 mapped address considered harmful

From: Anthony DeRobertis (asd@suespammers.org)
Date: 08/27/02 

From: Anthony DeRobertis <asd@suespammers.org>
To: Jun-ichiro itojun Hagino <itojun@iijlab.net>
Date: 27 Aug 2002 00:18:28 -0400

On Thu, 2002-08-22 at 12:18, Jun-ichiro itojun Hagino wrote:

> This ambiguity creates chances to malicious party to trick victim nodes.
> Here are a couple of examples:

How are these any different than with IPv4? I can send bad source
addresses in IPv4 just as easily as in IPv6. IPv6 might even make it
easier to do, e.g., reverse-path filtering (less prefixes to worry
about).

Any kernel that takes a packet saying it is from the local host
off the wire is broken.

Any firewall that allows through a packet from the Internet saying
it is from the LAN is broken.

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