nanog mailing list archives
Re: Issues encountered with assigning .0 and .255 as usable addresses?
From: bmanning () vacation karoshi com
Date: Tue, 23 Oct 2012 23:03:55 +0000
ok... so lets look at some space here. 98.32.0.0/22 98.32.0.0/32 is clearly on the unusable boundary. what about 98.32.0.255/32 & 98.32.1.0/32 ??? 98.32.4.255/32 is also clearly on the unusable boundary... UNTIL the delegation moves from a /22 to a /21. Then its usable. clear? thought so. /bill On Tue, Oct 23, 2012 at 10:00:53PM +0200, Tore Anderson wrote:
* Job SnijdersIn the post-classfull routing world .0 and .255 should be normal IP addresses. CIDR was only recently defined (somewhere in 1993) so I understand it might take companies some time to adjust to this novel situation. Ok, enough snarkyness! Quite recently a participant of the NLNOG RING had a problem related to an .255 IP address. You can read more about it here: https://ring.nlnog.net/news/2012/10/ring-success-the-ipv4-255-problem/AIUI, that particular problem couldn't be blamed on lack of CIDR support either, as 91.218.150.255 is (was) a class A address. It would have had to be 91.255.255.255 or 91.0.0.0 for it to be special in the classful pre-CIDR world. That said, it's rather common for people to believe that a /24 anywhere in the IPv4 address space is a +class C; so I'm not really surprised. -- Tore Anderson Redpill Linpro AS - http://www.redpill-linpro.com/
Current thread:
- Issues encountered with assigning .0 and .255 as usable addresses? Paul Zugnoni (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Bryan Tong (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Matt Buford (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Dan White (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Job Snijders (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Tore Anderson (Oct 23)
- RE: Issues encountered with assigning .0 and .255 as usable addresses? Darren O'Connor (Oct 23)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? bmanning (Oct 24)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Tore Anderson (Oct 23)
- RE: Issues encountered with assigning .0 and .255 as usable addresses? David Hubbard (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Joe Greco (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Mark Andrews (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Joe Greco (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Mark Andrews (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Jimmy Hess (Oct 22)
- Issues encountered with assigning all ones IPv6 /64 address? (Was Re: Issues encountered with assigning .0 and .255 as usable addresses?) Andy Smith (Oct 23)
- Re: Issues encountered with assigning all ones IPv6 /64 address? (Was Re: Issues encountered with assigning .0 and .255 as usable addresses?) Rob Laidlaw (Oct 23)
- Re: Issues encountered with assigning all ones IPv6 /64 address? (Was Re: Issues encountered with assigning .0 and .255 as usable addresses?) Sander Steffann (Oct 23)
- Re: Issues encountered with assigning all ones IPv6 /64 address? (Was Re: Issues encountered with assigning .0 and .255 as usable addresses?) Andy Smith (Oct 23)
- Re: Issues encountered with assigning all ones IPv6 /64 address? (Was Re: Issues encountered with assigning .0 and .255 as usable addresses?) Mike Jones (Oct 23)
- Re: Issues encountered with assigning all ones IPv6 /64 address? (Was Re: Issues encountered with assigning .0 and .255 as usable addresses?) Rob Laidlaw (Oct 23)
(Thread continues...)