> 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 <mailto: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 <mailto:Peterboro@mailman.lug.org.uk> >> https://mailman.lug.org.uk/mailman/listinfo/peterboro >
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