nanog mailing list archives
Re: job screening question
From: William Herrin <bill () herrin us>
Date: Fri, 6 Jul 2012 21:45:15 -0400
On Fri, Jul 6, 2012 at 8:51 PM, Ben Aitchison <ben () meh net nz> wrote:
Like when you have a /24 subnet routed to a customer, how many IP addresses can they use? 254? 253? To my thinking - if it's a routed subnet that means the gateway is on a different address, and it'd be prudent to still have the double broadcast addresses. It is also possible to utilise all 256 addresses.
There can be hidden down sides to trying that. I tried to use all 17 addresses from my Cox Business Internet /28 (the 16 in the /28 and the "router's" external address). Rigged it as a /24 inside and used proxy arp to move the outside addresses back out including the fake .1 default gateway that the router offered arp for but didn't hold. Only the first 16 of the 17 addresses worked. Which 16? Why, the first 16 the cable modem saw a packet from after power-on. Made for some interesting debugging. Regards, Bill Herrin -- William D. Herrin ................ herrin () dirtside com bill () herrin us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
Current thread:
- Re: job screening question, (continued)
- Re: job screening question Nick Olsen (Jul 05)
- Re: job screening question Scott Weeks (Jul 05)
- Re: job screening question Scott Weeks (Jul 05)
- Re: job screening question Diogo Montagner (Jul 05)
- Re: job screening question Jared Mauch (Jul 05)
- Re: job screening question Scott Weeks (Jul 05)
- Re: job screening question Matthew Palmer (Jul 05)
- Re: job screening question Ben Aitchison (Jul 06)
- Re: job screening question Jared Mauch (Jul 06)
- Re: job screening question David Edelman (Jul 06)
- Re: job screening question William Herrin (Jul 06)
- Re: job screening question Matthew Palmer (Jul 06)
- Re: job screening question Owen DeLong (Jul 06)
- Re: job screening question Bryan Irvine (Jul 06)
- Re: job screening question JC Dill (Jul 07)
- Re: job screening question Matthew Palmer (Jul 07)
- Re: job screening question George Herbert (Jul 07)
- Re: job screening question William Herrin (Jul 07)
- Re: job screening question Jimmy Hess (Jul 07)
- RE: job screening question Keith Medcalf (Jul 07)
- Re: job screening question Owen DeLong (Jul 07)
- Re: job screening question Matthew Palmer (Jul 05)