Albert ARIBAUD (albert.arib...@free.fr) wrote on Fri, Oct 23, 2015 at 04:58:40PM BRST: > Hi Ed, > > Le Fri, 23 Oct 2015 17:55:06 +0100, Ed W <li...@wildgooses.com> a > écrit : > > > Hi > > > > I notice an anomaly with my OnePlus Android phones. They have been > > acquiring additional leases for no good reason. Here is a dump from a > > little app I have which monitors ARP and dhcp lease allocations: > > > > 192.168.105.103/c0:ee:fb:34:64:18 - OnePlus Tech (Shenzhen) Ltd - > > android-a837a8c17ea54bc3 - leased until: 2015-10-26T16:34:12 - seen: > > 2015-10-23T16:39:00 > > 192.168.105.105/c0:ee:fb:34:64:18 - OnePlus Tech (Shenzhen) Ltd - leased > > until: 2015-10-24T14:31:08 > > 192.168.105.106/c0:ee:fb:34:64:18 - OnePlus Tech (Shenzhen) Ltd - leased > > until: 2015-10-25T16:05:49 > > 192.168.105.115/c0:ee:fb:42:63:b1 - OnePlus Tech (Shenzhen) Ltd - leased > > until: 2015-10-24T14:28:00 > > 192.168.105.116/c0:ee:fb:42:63:b1 - OnePlus Tech (Shenzhen) Ltd - leased > > until: 2015-10-24T15:34:39 > > 192.168.105.117/c0:ee:fb:42:63:b1 - OnePlus Tech (Shenzhen) Ltd - leased > > until: 2015-10-25T12:16:12 > > 192.168.105.118/c0:ee:fb:42:63:b1 - OnePlus Tech (Shenzhen) Ltd - > > android-9fe15ff2e8e65398 - leased until: 2015-10-26T15:45:48 - seen: > > 2015-10-23T16:39:00 > > > > DNSMasq 2.75, operating on a bridge br0 of two devices wlan/lan. > > > > What you can see here are my two OnePlus devices have apparently > > acquired additional leases for no obvious reason. The "seen" shows that > > my arp-ping isn't seeing any answer on the other lease addresses, so we > > can be sure it's not a genuine case of multiple IPs per MAC > > > > The relevant config is > > dhcp-range=192.168.105.50,192.168.105.150,72h > > dhcp-authoritative > > > > Unfortunately I don't have the logs for the allocations (it's on a small > > router which logs to memory only). > > > > However, my best guess on what happened is that on lease renewal the > > Android device is answering dnsmasq's ping (to check if the IP is free)? > > > > If this is interesting/plausible I can try cranking down my lease times > > and record the logs to see if I can catch it in action? > > Problem is, we don't see what IP is requested, nor do we see which DHCP > requests or replies are sent.
Yes. Also, how do you know the client didn't release the address before requesting another one? > Can you ssh to your server from your desktop machine? If yes, then you > should do so, then through this shell, kill the background dnsmasq and > launch it in the foreground (with -d, and -q --log-dhcp too). Make sure > you log your ssh session. Good idea. _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
