nanog mailing list archives
Re: ISP customer assignments
From: Michael Dillon <wavetossed () googlemail com>
Date: Tue, 13 Oct 2009 19:54:36 +0100
I'm ok with teaching it to beginners to explain where we came from but that should be it.
But why does that have to be done first? Why can't they teach current best practice in addressing, and then point out that historically it was done different but that caused problems which led to today's system?
That said I still occasionally refer to networks in classful terms and I can think of several network engineers who have years of enterprise experience that still don't understand CIDR.
I'm very careful about classful terminology because I work with a team of engineers who still occasionally must deal with a customer network (using very old gear) which requires class C addressing. For those who don't know what a Class C address is, it is an IP address in the range 192.0.0.0 to 223.255.255.255, i.e. it begins with binary 110, and the network prefix is fixed at /24. This means that 10.2.3/24 is not a class C address, and 192.2/16 is not a legal address block. --Michael Dillon
Current thread:
- Re: ISP customer assignments, (continued)
- Re: ISP customer assignments Michael Dillon (Oct 15)
- Re: ISP customer assignments Chris Adams (Oct 15)
- Re: ISP customer assignments Nathan Ward (Oct 15)
- Re: ISP customer assignments Dave Temkin (Oct 15)
- Re: ISP customer assignments Rob Evans (Oct 16)
- Re: ISP customer assignments William Herrin (Oct 15)
- Re: ISP customer assignments Tore Anderson (Oct 16)
- RE: ISP customer assignments Wouter de Jong (Oct 14)
- Re: ISP customer assignments Joel Jaeggli (Oct 13)
- Re: ISP customer assignments Justin Shore (Oct 13)
- Re: ISP customer assignments Michael Dillon (Oct 13)
- Re: ISP customer assignments Bill Stewart (Oct 19)
- Re: ISP customer assignments Nathan Ward (Oct 19)
- Re: ISP customer assignments bmanning (Oct 19)
- Re: ISP customer assignments Nathan Ward (Oct 19)
- Re: ISP customer assignments Bill Stewart (Oct 20)
- Re: ISP customer assignments Mark Andrews (Oct 20)
- Re: ISP customer assignments Karl Auer (Oct 20)
- Re: ISP customer assignments Mark Andrews (Oct 20)
- Re: ISP customer assignments Roland Dobbins (Oct 20)
- Re: ISP customer assignments Mark Andrews (Oct 20)