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North American Network Operators Group

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Re: RFC1918 conformance

  • From: Andrew Partan
  • Date: Tue Feb 11 12:50:35 1997

> > ! Deny martian routes
> > ! 1st and last classical B and C nets (guard nets).
> > access-list 180 deny   ip 128.0.0.0 0.0.255.255 255.255.0.0 0.0.255.255
> > access-list 180 deny   ip 191.255.0.0 0.0.255.255 255.255.0.0 0.0.255.255
> > access-list 180 deny   ip 192.0.0.0 0.0.0.255 255.255.255.0 0.0.0.255
> > access-list 180 deny   ip 223.255.255.0 0.0.0.255 255.255.255.0 0.0.0.255
> 
> 	In a classless environment, these prefixes are legitimate.
> 	Correct behaviour is now known for these subnets and so I
> 	wonder why you still have them in your standard list.

They sure look reserved to me:
note% whois RESERVED
IANA (RESERVED-1)               RESERVED                               0.0.0.0
IANA (RESERVED-3)               RESERVED                             128.0.0.0
IANA (RESERVED-4)               RESERVED                           191.255.0.0
IANA (RESERVED-5)               RESERVED                         223.255.255.0
IANA (RESERVED-7)               Reserved                   64.0.0.0 - 95.0.0.0
IANA (RESERVED-8)               Reserved                  96.0.0.0 - 126.0.0.0

Actually it looks like I should add the top 1/2 of the old A space as well.

It also looks like someone did something really silly with 192.0.0/24:

note% whois 192.0.0 
IANA (NET-ROOT-NS-LAB)
   c/o Information Sciences Institute
   4676 Admiralty Way, Suite 1001
   Marina del Rey, CA 90292-6695

   Netname: ROOT-NS-LAB
   Netnumber: 192.0.0.0

   Coordinator:
      Manning, Bill  (WM110)  bmanning@ISI.EDU
      310-322-8102

   Domain System inverse mapping provided by:

   ORB.ISI.EDU                  128.9.160.66
   NS.ISI.EDU                   128.9.128.127

   Record last updated on 01-Jul-96.

This idea looks really dumb, and since my >/24 filter blocks these
in any case, I see no reason to listen to silly people to unblock
this /24.

Poking a bit further at this, it looks like 192.0/16 is all reserved
as well:
   Netname: RESERVED-192
   Netblock: 192.0.0.0 - 192.0.255.0

Humm, more bogons to add to my filter?
	--asp@partan.com (Andrew Partan)
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