[15678] in North American Network Operators' Group
Re: Someones being naughty again...
daemon@ATHENA.MIT.EDU (markp@perki.net)
Sun Mar 15 12:11:34 1998
From: markp@perki.net
Date: 14 Mar 1998 22:42:09 -0000
To: blakew@cais.net, marcs@znep.com
Cc: nanog@merit.edu
> On Sat, 14 Mar 1998, Blake Willis wrote:
>
> It _does_ break things if not done with very careful attention. Most of
> the people using it have no clue about how it can break things and are
> bewildered when it is explained to them.
>
> For example? A router with one ATM interface going to the world with a
> high MTU with an ethernet on the other side. Say you use private IP space
> for links on that router. Say someone on the Internet filters traffic
> from private netblocks; lots of people do. There _can_ be machines that
> are completely unable to transfer data (eg. download a web page) from
> another because you just broken path MTU discovery. This is not a made up
> situation, this is a real example that I have had to deal with of how
> using private IP space for
> network interfaces used for public traffic does break things in some
> situations.
Also protocols like CUSeeMe that embed IP addresses in the protocol
will break for any leaf nodes that have a private netblock address.
>
>
