[14048] in Athena Bugs
Re: Weird IP TOSs on 18.181
daemon@ATHENA.MIT.EDU (Jeffrey I. Schiller)
Mon Dec 11 01:42:53 1995
Date: Mon, 11 Dec 1995 01:42:33 -0500
To: John Hawkinson <jhawk@MIT.EDU>
From: jis@MIT.EDU (Jeffrey I. Schiller)
Cc: rtfm-maintainers@MIT.EDU, anxiety-maintainers@MIT.EDU,
sipb-irc-maintainers@MIT.EDU, network@MIT.EDU, bugs@MIT.EDU,
hartmans@MIT.EDU, elliot@MIT.EDU, webmaster@MIT.EDU
At 1:24 12/10/95, John Hawkinson wrote:
>* OSPF Hello messages from W20-RTR with Internetwork Control. Unfortunately,
> this reflects a misconfiguration of MITnet routers. By sending OSPF
> Hellos on ethernet interfaces (meaning that the interfaces were not
> marked as "passive" in the router configuration), any OSPF neighbors
> on a particular subnet would be discovered. This would allow the
> so-called "dealing IP" where any workstation could inject /32s into
> MITnet's IGP [see Hacker, Alyssa P. "IP Address Shortage Spurs Black
> Market". Voo Doo Magazine, Late Fall '95, pp. 22-23].
Actually I purposefully left the Ethernets active. If this is abused, it
will get changed pretty quick :-). Non net-18 advertisements will be stoped
before they get to NEARnet anyway. Only my Butt Razer is permitted to steal
IP addresses!
>* I don't really know what "Flash Override" is. I suspect that some IRC weenie
> managed to confuse IP Precedence "flash" with IRC "flash", which are
> two very different things, the former presumably specified by the DOD,
> the latter hopefully not. Perhaps logs of the IRC server provide
> interesting information at this time. Unknown.
Flash Override is a DOD network term (this is a leftover from IP's military
roots). DOD phones have an extra row of touch tone buttons. They are
labeled something like: "priority", "priority override", "flash" and "flash
override." Each one is higher priority then the previous. Each one also has
a defined use (at least Flash and Flash Override do). Flash is defined for
the use in "National Defense" (as in defense of the continent). [Thus all
the "Flash traffice on the ELF" lines in submarine movies]. Flash Override
is only for messages required for "National Survival" (as in we are about
to get nuked!).
-Jeff
