Re: Confirmation to advance: draft-ietf-6man-ipv6only-flag-05

[Nick Hilliard <[e-mail]>]

Brian E Carpenter wrote on 08/05/2019 00:18:
> Nick, excuse top posting but it seems to me that you are
> assuming that in a managed network, the hosts are all
> managed too.

erm, didn't say this. Didn't even imply it!  :-(

>               That's certainly a false assumption in my
> experienced: managed routers and access points with
> BYOD hosts is a very common scenario.

If you're running a BYOD network which is large enough that you actually 
care about whether people are attempting ipv4, then it probably falls 
into the gigantic l2 domain category, and you should be using the 
management capabilities of the APs to block ethertypes 0x0800 and 
0x0806.  If your APs don't support this functionality, then this is a 
mixture case of using kit which is unfit for purpose and pretending that 
you're running a "managed network" when the reality is that you aren't 
(and no, having a mess of unmanaged l2 behind a competently provisioned 
layer 3 device is not "managed" in any meaningful sense).  If it's not 
large enough to matter, then the flag isn't really relevant anyway.

Nick