nanog mailing list archives
Re: Issues encountered with assigning .0 and .255 as usable addresses?
From: "Scott Weeks" <surfer () mauigateway com>
Date: Mon, 22 Oct 2012 15:57:18 -0700
--- 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
Current thread:
- Re: Issues encountered with assigning .0 and .255 as usable addresses?, (continued)
- 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? 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?) Marc Storck (Oct 23)
- Re: Issues encountered with assigning all ones IPv6 /64 address? (Was Re: Issues encountered with assigning .0 and .255 as usable addresses?) Joel Maslak (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? Sander Steffann (Oct 24)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Scott Weeks (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? Justin Krejci (Oct 22)
- Re: Issues encountered with assigning .0 and .255 as usable addresses? james machado (Oct 23)