mailing list archives
Re: Common operational misconceptions
From: Ray Soucy <rps () maine edu>
Date: Thu, 16 Feb 2012 08:17:03 -0500
I help with networking curriculum and labs here at the University of
Maine, especially for network security.
There seems to be (even among faculty) a gross misunderstanding of
Layer-2. Nearly every textbook starts with IP, and talks about it as
if we were 20 years in the past.
I've found starting off with some history on Ethernet (Maine loves Bob
Metcalfe) becomes a very solid base for understanding; how "Ethernet"
today is very different; starting with hubs, bridges, collisions, and
those problems, then introducing modern switching, VLANs, broadcast
Then expanding on that by introducing Layer-3 starting with its
relationship to L-2 (ARP, how packets are manipulated when a host
makes the determination if a packet is on link or needs to be routed,
On Thu, Feb 16, 2012 at 8:03 AM, Owen DeLong <owen () delong com> wrote:
On Feb 16, 2012, at 4:31 AM, Jared Mauch wrote:
On Feb 15, 2012, at 7:55 PM, Nathan Eisenberg wrote:
IPv6 is operational.
How is this a misconception? It works fine for me...
I think he left off "In Japan". There's been a lot of local politics as it relates to the broken nature of IPv6 in
japan. When its there, it's not globally accessible in many cases (at the consumer or last-mile level). Most
(all?) major backbones are IPv6 capable these days, but in some cases it's 6PE vs "native".
IPv6 is operational and does work, but like any protocol there are issues. If you are unaware, take a look at what
people are trying to put into IPv4 still at IETF. The fact that the IPv6 day went so well last year, and the IPv6
launch is coming quickly is a reminder its real. Me? I can't wait to have this behind us. (Oh, and if you're not
at least routing your IPv6 space to your lab/NOC LAN, get on it. Even if you have to poke the 'security' guys who
think you need an IPv6 NAT in the eye).
Yes, I'm well aware of the problems being created by the attempts by NTT to force the government to let them be a
Epic Communications Specialist
Phone: +1 (207) 561-3526
Networkmaine, a Unit of the University of Maine System