[142023] in North American Network Operators' Group
Re: The stupidity of trying to "fix" DHCPv6
daemon@ATHENA.MIT.EDU (Ray Soucy)
Thu Jun 16 15:08:41 2011
In-Reply-To: <20110616.203712.74753647.sthaug@nethelp.no>
Date: Thu, 16 Jun 2011 15:08:37 -0400
From: Ray Soucy <rps@maine.edu>
To: sthaug@nethelp.no
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Are you not using managed switches?
It takes me about 1 second to find exactly which device and which port
a device is connected to. Once you know that; you have a pretty nice
collection of statistics and log messages that usually tell you
exactly what is wrong.
Or am I missing something?
On Thu, Jun 16, 2011 at 2:37 PM, <sthaug@nethelp.no> wrote:
>> "Ethernet doesn't scale because of large amounts of broadcast traffic."
>>
>> We started to introduce multicast, and multicast-aware switches in
>> IPv4; in IPv6 there is no broadcast traffic. =A0We won't be able to
>> scale networks up until we can turn off IPv4,
>
> In other words, probably not for another decade at least?
>
>> but once we can IPv6
>> will be able to grow much larger in terms of per-LAN. =A0 The best
>> practice of no more than 512 per broadcast domain will seem very
>> outdated at that point; especially when you add in multicast flood
>> protection, the available bandwidth goes up, and performance of
>> network interfaces improves.
>
> Yes and no. If you remove the broadcast traffic you can *in theory*
> scale higher. However, this does nothing for the difficulty of L2
> troubleshooting, which is a real problem in large flat L2 networks.
>
>> The link you pointed to is talking about flat networks of tens of
>> thousands of hosts; that might be excessive right now... =A0But I can
>> certainly see an IPv6-only LAN (with some filtering to make sure ARP
>> and IPv4 traffic is dropped at the port) scaling easily to thousands
>> of hosts with today's hardware.
>
> I'm afraid I remain sceptical, unless we come up with significantly
> improved methods for L2 troubleshooting.
>
> Steinar Haug, Nethelp consulting, sthaug@nethelp.no
>
--=20
Ray Soucy
Epic Communications Specialist
Phone: +1 (207) 561-3526
Networkmaine, a Unit of the University of Maine System
http://www.networkmaine.net/
