Migrating subnets between failover peers

[Bob Harold]

Thanks for clarifying!

-- 
Bob Harold



On Fri, Jul 12, 2019 at 3:05 PM Simon Hobson <dhcp1 at thehobsons.co.uk> wrote:

> Bob Harold <rharolde at umich.edu> wrote:
>
> > Set as "authoritative" if desired (probably a good idea).
>
> It's far more than "a good idea" - unless you have a good reason to leave
> it off, then you should always have your server(s) set as authoritative. I
> have first hand experience of what can happen if a server is not
> authoritative with certain clients.
> Specifically, Microsoft chose to deal with stability by having the clients
> be very "clingy" to their address rather than doing it in the server. As a
> result, if you move a Windows client to a different network then it will
> persist on trying to use it's lease until expiry - while other clients seem
> to be better at noticing that the network has changed. If the DHCP server
> is authoritative, then it will Nack requests from the client and thus force
> it to ask for a new lease and largely avoid this issue - if it's not
> authoritative then you are far more in the hands of client behaviour.
>
> Worse than a client trying to use an address from a different subnet (and
> thus stopping that client from working), would be a client trying to use an
> address from the same subnet (ie RFC1918 address) but from a different
> network - and thus causing an address collision that could take out more
> than just the one client.
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