On 25 October 2016 at 11:51, Edward Kerr <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
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