nanog mailing list archives
Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets.
From: "Robert E. Seastrom" <rs () seastrom com>
Date: Tue, 08 Jan 2008 12:23:07 -0500
Jon Lewis <jlewis () lewis org> writes:
On Tue, 8 Jan 2008, Joe Provo wrote:Until you assign a .255/32 to a router loopback interface and then find that you can't get to it because some silly router between you and it thinks '.255? that's a broadcast address.'See the qualifier "where you don't care that broken or archaic systems cannot reach them". If you have brokenness on your internal systems then yes, you'd be shooting yourself in the foot.Until you shoot yourself in the foot, how would you know you have such brokenness on your internal systems? That silly router happened to be a 7206 running (IIRC) 12.1T code. Unless you really don't care about the brokenness, or really want to root it all out, I'd avoid using .0 and .255 IPs.
At Inter.Net, we specifically excluded .0 and .255 from our DSL pools so as to not screw up the day of people running outdated Windows software any more than it was already screwed up. At some point you have to weigh the relative costs of 0.78% waste in IP address space vs. technician time to troubleshoot the lossage. With due respect to jzp, I'll err on the side of saving myself the bucks. ---Rob
Current thread:
- Using x.x.x.0 and x.x.x.255 host addresses in supernets. Joshman at joshman dot com (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Patrick W. Gilmore (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Joe Provo (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Jon Lewis (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Joe Provo (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Jon Lewis (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Robert E. Seastrom (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. JAKO Andras (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Jon Lewis (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Robert E. Seastrom (Jan 08)
- RE: Using x.x.x.0 and x.x.x.255 host addresses in supernets. David Schwartz (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. James R. Cutler (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Robert E. Seastrom (Jan 09)
- <Possible follow-ups>
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Scott Weeks (Jan 08)
- Re: Using x.x.x.0 and x.x.x.255 host addresses in supernets. Joshman at joshman dot com (Jan 10)