North American Network Operators Group

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Re: Someones being naughty again...

  • From: markp
  • Date: Sun Mar 15 12:12:21 1998

> 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.