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?
Thanks
Ed W
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