Thanks Mark for your helpful input here. And others as well - much appreciated
It is good to be able to learn when it is not mission critical! (Let it not be said of me, “We live it is true, but we learn nothing” Samuel Beckett, Waiting for Godot) I will simply wait to allow the system to sort itself out. Perhaps I should not have allowed my desire for order and arrangement to have got the better of me!! Edward Kerr ----------------- > On 25 Oct 2016, at 14:17, Mark Rogers via Peterboro > <peterboro@mailman.lug.org.uk> wrote: > > On 25 October 2016 at 11:51, Edward Kerr <e.k...@plumbline.org.uk > <mailto:e.k...@plumbline.org.uk>> wrote: > I will be able to leave the router turned off for a few days, and perhaps > that might reset the lease time. > > Remember that after a device requests an IP address from the DHCP server, it > no longer talks to the DHCP server until its lease renews. There isn't much > the DHCP server can do to shorten the lease once issued[*]. If your tablet > has been told it can use that IP address for the rest of the month then it > has every right to keep doing so until the end of the month! > > For that reason, of-course, lease times are usually shorter than months! > Looking on my own network, a week looks closer. The resources I mentioned > earlier should tell you what the lease times are (eg in Windows, "ipconfig > /all" includes "Lease Obtained" and "Lease Expires" information). If you > leave the router off for a few days it will quite possibly coincide with it > fixing itself because the lease expired, so don't fall for the obvious (but > incorrect) conclusion that this process actually fixed it! > > The /release and /renew trick *should* have worked but if Windows needed a > reboot then I'm not really surprised. How to force it on other devices such > as tablets I don't know, although since they are likely working over Wifi one > thing that might work is to change the Wifi password so that they are all > forced to start afresh. > > If waiting is a big issue, what I've also done in the past is taken the > opportunity to move everything to a new subnet and set things up the way I > want. > > A proper DHCP server (ie probably not what is built into the router) will > allow you to set the DHCP lease time so that you can avoid this in the > future, although having set IP addresses the way you want it'll probably > never be an issue again anyway. > > [*] At least this is how I understand it! > -- > Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 > Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER > _______________________________________________ > Peterboro mailing list > Peterboro@mailman.lug.org.uk > https://mailman.lug.org.uk/mailman/listinfo/peterboro
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