RE: [DNA] QUESTION: Remove Link Down information indraft-ietf-dna-link-information-03

[Alper Yegin <alper.yegin@yegin.org>]

> > are L2 technologies and architectures that can secure link up but not
> link
> > down? Otherwise link up would be as harmful as link down is.
> 
> Perhaps this is referring to the ability to spoof management traffic that
> can result in a "Link Down" indication?  For example, in 802.11 the 4-way
> handshake is secured, but management traffic such as Disassociate,
> Deauthnticate, etc. are not (this is fixed in 802.11w).  So "Link Up" is
> not spoofable (at least in 802.11i) but "Link Down" is.
> 
> On the other hand, a microwave oven, or large scissors will also do the
> trick for many links ;)

Yes, this is a good example. But are there enough many other examples to say
"nobody has ever figured out a way to allow it (link down) to be done
securely."?

Btw, this does not say "link down is harmful" to me. It says there are
technologies whose link can be brought down by attackers. Whether a link is
brought down legitimately or maliciously, it is down as far as the L2 and L3
are concerned. 


Alper