[157447] in North American Network Operators' Group
Re: Issues encountered with assigning .0 and .255 as usable addresses?
daemon@ATHENA.MIT.EDU (Scott Weeks)
Mon Oct 22 18:57:33 2012
Date: Mon, 22 Oct 2012 15:57:18 -0700
From: "Scott Weeks" <surfer@mauigateway.com>
To: <nanog@nanog.org>
Reply-To: surfer@mauigateway.com
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
--- job@instituut.net wrote:
From: Job Snijders <job@instituut.net>
> Curious whether it's commonplace to find systems that automatically regard
> .0 and .255 IP addresses (ipv4) as src/dst in packets as traffic that should
> be considered invalid. When you have a pool of assignable addresses, you
> should expect to see x.x.x.0 and x.x.x.255 in passing traffic (ie. VIP or NAT
> pool, or subnets larger than /24). Yet I've run into a commercial IP mgmt product
> and getting reports of M$ ISA proxy that is specifically blocking traffic for an
> IP ending in .0 or .255.
I used about a /15s worth of /23s for DHCP at a previous employer for 5 years
(2005 - 2010) and they're still using them today years later. Never got one
complaint AFAIK. I even got one of the .0 or .255 addresses for a while and
never had trouble. This was discussed in detail a while back. Look in the
archives.
scott
