Re: [v6ops] Please review the No IPv4 draft

[Philip Homburg <[e-mail]>]

In your letter dated Mon, 14 Apr 2014 11:36:46 -0500 you wrote:
>It's broadcast traffic, which is expensive for everyone sharing a Wifi AP.   I
>f every host is doing it, that's a lot of traffic.
>
>Also, if I get a DHCPDISCOVER, and response with a DHCPOFFER with this option,
> is the expectation that the client will shut down at that point?   That's a s
>ubstantial protocol change, if so.   If we're going all the way to DHCPACK, no
>w the client has an IP address.   What if it tries to use it?

I wonder if such an DHCPv4 option should be called 'no-service-at-the-moment'.
This can then be returned in the DHCPOFFER.

The option contains a timeout and clients should have a maximum what they
are willing the accept.

The client DHCP will stop sending DHCPDISCOVERs until the timeout has expired
or until the user/admin manually requests a DHCP lease.

This way the option becomes independent of IPv6 and can be use in any situation
where there won't be any offers for a while.

Note that if a client receives both an actual offer from one server and
the new option from an attacker, then the client can still continue with a
REQUEST, thus reducing the DoS potential.