Re: [dhcwg] [homenet] What to do when we lose DHCPv4 election?

[Juliusz Chroboczek <[e-mail]>]

>> When a Homenet router was previously acting as DHCPv4 server for
>> a link, and subsequently loses an election, should it:

>> 1. remain silent;
>> 2. remain silent in response to DHCPDISCOVER, but NAK any DHCPREQUEST; or
>> 3. NAK both DHCPDISCOVER and DHCPREQUEST?

> I think that #2 is probably correct

Thanks.  What after a renumbering event and the addresses that the client
requests are no longer onlink?  I'd like a precise reference, if that's
okay.

> 1) do Homenet-aware DHCPv4 servers pick the same rfc1918 address spaces to
>    give out?

Not necessarily -- if there are multiple prefixes assigned to the link,
the spec doesn't say which prefix is used by each server.  (Shncpd uses
them all, which I'm not sure is a good idea.)  Electing a single DHCPv4
server for each link works around the issue.

> 2) if a DHCPv4 server previously had given out leases, and the lease is still
>    valid, then I think that it ought to ACK a DHCP renew.

What if the prefix got renumbered, and the address is no longer being routed?