OK learning a bit here and there. Mark - I only have one DHCP server running. Good idea though
It appears that the DHCP server is in fact only leasing IP addresses from 192.168.1.50 which is the new setting I gave it. Good news! Thew problem is that the clients - and perhaps the DHCP server as well, are caching or hanging on to their “old” IP addresses, and not asking the DHCP server for a new on! I have forced a windows 10 machine to get a new IP address - using ipconfig /release net stop dhcp net start dhcp ifconfig /renew Windows complained bitterly but a reboot fixed that! Good news My Android has sorted itself, as has an iMac, but my iPad and another Android all refuse to play ball despite switching off, restarting, telling the iPad to renew lease etc. My router appears not to have the ability to release IP addresses on demand, or to have a clear out mechanism - scavenging I believe. I will be able to leave the router turned off for a few days, and perhaps that might reset the lease time. I shall wait and see. Edward Kerr ———————— > On 24 Oct 2016, at 10:49, Mark Rogers via Peterboro > <peterboro@mailman.lug.org.uk> wrote: > > On 22 October 2016 at 15:14, Edward Kerr via Peterboro > <peterboro@mailman.lug.org.uk <mailto:peterboro@mailman.lug.org.uk>> wrote: > All my DHCP machines are still being given IP address below .50 and above .10 > i.e. no change. > > You say "still being given" but have you confirmed that these are new leases > issued since you updated the router, not old ones that pre-date the change? > > In Linux you should find any lease information, including when it was > obtained and when it expires, in /var/lib/dhcp/dhclient*.leases . On Windows, > "ipconfig /all" should tell you. > > If your lease is a new one but still wrong, then the next thing to check is > that it is coming from your router, which you can verify in the same places. > I think it's unlikely that you have two DHCP servers running coincidentally > on the same subnet range, but I don't know your network and it's not > impossible! > > Note that when a device requests a new lease it will usually request the > address it already have (it's up to the server to re-issue the same address > or a new one); it might be that the server is re-issuing leases to existing > addresses and only using the settings for new requests rather than renewals. > Pretty unlikely though. > > Mark > -- > 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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