DHCP client state if rebooted when local DHCPD server is offline?

Gregory Sloop gregs at sloop.net
Thu Aug 14 17:01:58 UTC 2014

tlfc> I understand that if my LAN's dhcpd server is up, when any
tlfc> client on the lan is rebooted, it'll pick up its lease & IP address.

tlfc> What happens on the client if it reboots when the LAN's dhcpd
tlfc> is stopped, NOT serving dhcp info/leases?

tlfc> Does the client come up in the last known state?  With the
tlfc> last-used IP addresses?  Or, instead, default or random IP address info?

tlfc> I'm trying to understand what happens to daemons/listeners on a
tlfc> lan client, bound to a specific IP address, in that ^^ case.

I think we need to be a bit more specific. Do you mean:
The station/client gets, lets say, a 4 hour lease. After 20m, the station is rebooted. Does the station continue to use the "old" lease that it still has 3:40 left before it expires? [I think this is client dependent. Windows may work differently than Linux etc.] I *think* thoretically, that the station _could_ continue to use the old lease until it expires. But I don't believe it HAS to do so. And I don't know how particular clients handle these things in practicality. 

Perhaps someone who knows how different clients work in practice can chime in. A google search might be insightful too. [Or a search on the list archives.]
And on that note, what clients? Windows, Linux, Mac etc? And what versions?

If you mean, the lease is expired before the station is brought back up again, then it will need a new lease from the DHCP server.

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