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iPhone & other devices frequently losing Wi-Fi, lots of DHCP activity in system log

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theirongiant

theirongiant

Regular Contributor
I'm running Merlin's firmware 3.0.0.4.270.26

A great number of my wireless devices are constantly asking DHCP for an address. I read a while back that iPhones doing this too frequently were causing problems at Duke University. My Mac Pro with an Airport wireless card is not behaving this way.

I'll be actively using the iPhone (iphone-giant) on Wi-Fi, with a very strong signal, and suddenly it drops back to cellular. I have to turn Wi-Fi off, then on again. Frustrating.

I've also caught my Airport Express (airex-n) blinking orange from time to time, for just a few seconds. Then the Airport Utility opens up on ALL of my Macs, reports an error with the Express, then it quits as soon as its light turns green.

Code: 
Jun 23 08:58:43 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.108 0c:77:1a:1f:7c:f8 Erised
Jun 23 08:59:43 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 08:59:43 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:00:30 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:00:30 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:02:02 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:02:02 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:03:04 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:03:04 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:03:47 dnsmasq-dhcp[5912]: DHCPDISCOVER(br0) 10:93:e9:0d:90:c4 
Jun 23 09:03:47 dnsmasq-dhcp[5912]: DHCPOFFER(br0) 192.168.11.172 10:93:e9:0d:90:c4 
Jun 23 09:03:47 dnsmasq-dhcp[5912]: DHCPDISCOVER(br0) 10:93:e9:0d:90:c4 
Jun 23 09:03:47 dnsmasq-dhcp[5912]: DHCPOFFER(br0) 192.168.11.172 10:93:e9:0d:90:c4 
Jun 23 09:03:48 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.172 10:93:e9:0d:90:c4 
Jun 23 09:03:48 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.172 10:93:e9:0d:90:c4 molly-macbookair
Jun 23 09:03:51 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:03:51 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:03:55 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.106 04:54:53:0d:a1:36 
Jun 23 09:03:55 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.106 04:54:53:0d:a1:36 studio
Jun 23 09:03:57 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.109 dc:2b:61:2f:31:c4 
Jun 23 09:03:57 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.109 dc:2b:61:2f:31:c4 iPhone-Giant-2
Jun 23 09:04:58 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.109 dc:2b:61:2f:31:c4 
Jun 23 09:04:58 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.109 dc:2b:61:2f:31:c4 iPhone-Giant-2
Jun 23 09:05:10 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.185 00:24:6c:cd:3d:0d 
Jun 23 09:05:10 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.185 00:24:6c:cd:3d:0d RAP3D0D
Jun 23 09:05:22 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:05:22 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:05:58 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.109 dc:2b:61:2f:31:c4 
Jun 23 09:05:58 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.109 dc:2b:61:2f:31:c4 iPhone-Giant-2
Jun 23 09:07:06 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.110 5c:95:ae:33:40:ca 
Jun 23 09:07:06 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.110 5c:95:ae:33:40:ca 
Jun 23 09:07:29 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:07:29 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:08:15 dnsmasq-dhcp[5912]: DHCPDISCOVER(br0) 74:e1:b6:c6:56:25 
Jun 23 09:08:15 dnsmasq-dhcp[5912]: DHCPOFFER(br0) 192.168.11.162 74:e1:b6:c6:56:25 
Jun 23 09:08:17 dnsmasq-dhcp[5912]: DHCPDISCOVER(br0) 74:e1:b6:c6:56:25 
Jun 23 09:08:17 dnsmasq-dhcp[5912]: DHCPOFFER(br0) 192.168.11.162 74:e1:b6:c6:56:25 
Jun 23 09:08:18 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.162 74:e1:b6:c6:56:25 
Jun 23 09:08:18 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.162 74:e1:b6:c6:56:25 iPad3-64GB
Jun 23 09:08:35 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.109 dc:2b:61:2f:31:c4 
Jun 23 09:08:35 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.109 dc:2b:61:2f:31:c4 iPhone-Giant-2
Jun 23 09:08:51 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.109 dc:2b:61:2f:31:c4 
Jun 23 09:08:51 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.109 dc:2b:61:2f:31:c4 iPhone-Giant-2
Jun 23 09:08:56 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:08:56 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:09:57 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.109 dc:2b:61:2f:31:c4 
Jun 23 09:09:57 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.109 dc:2b:61:2f:31:c4 iPhone-Giant-2
Jun 23 09:10:01 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:10:01 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:11:03 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:11:03 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:12:03 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.106 04:54:53:0d:a1:36 
Jun 23 09:12:03 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.106 04:54:53:0d:a1:36 studio
Jun 23 09:12:06 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:12:06 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:12:38 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.179 00:24:be:90:7a:cb 
Jun 23 09:12:38 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.179 00:24:be:90:7a:cb sony-player
Jun 23 09:12:53 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.110 5c:95:ae:33:40:ca 
Jun 23 09:12:53 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.110 5c:95:ae:33:40:ca 
Jun 23 09:14:13 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:14:13 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:14:58 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:14:58 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:15:22 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.10 0c:ee:e6:e1:18:3f 
Jun 23 09:15:22 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.10 0c:ee:e6:e1:18:3f brother-hl2170w
Jun 23 09:16:25 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.185 00:24:6c:cd:3d:0d 
Jun 23 09:16:25 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.185 00:24:6c:cd:3d:0d RAP3D0D
Jun 23 09:16:47 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:16:47 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:17:37 dnsmasq-dhcp[5912]: DHCPDISCOVER(br0) 88:cb:87:b3:9e:a7 
Jun 23 09:17:37 dnsmasq-dhcp[5912]: DHCPOFFER(br0) 192.168.11.156 88:cb:87:b3:9e:a7 
Jun 23 09:17:38 dnsmasq-dhcp[5912]: DHCPDISCOVER(br0) 88:cb:87:b3:9e:a7 
Jun 23 09:17:38 dnsmasq-dhcp[5912]: DHCPOFFER(br0) 192.168.11.156 88:cb:87:b3:9e:a7 
Jun 23 09:17:39 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.156 88:cb:87:b3:9e:a7 
Jun 23 09:17:39 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.156 88:cb:87:b3:9e:a7 
Jun 23 09:18:08 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.124 04:54:53:0a:2c:b8 
Jun 23 09:18:08 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.124 04:54:53:0a:2c:b8 molly-imac
Jun 23 09:18:08 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.110 5c:95:ae:33:40:ca 
Jun 23 09:18:08 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.110 5c:95:ae:33:40:ca 
Jun 23 09:18:10 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:18:10 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:18:32 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.99 00:26:b0:f3:d1:38 
Jun 23 09:18:32 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.99 00:26:b0:f3:d1:38 tardis
Jun 23 09:19:12 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:19:12 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
Jun 23 09:19:57 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.192 28:cf:da:19:e5:63 
Jun 23 09:19:57 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.192 28:cf:da:19:e5:63 Apple-TV-2
Jun 23 09:20:13 dnsmasq-dhcp[5912]: DHCPREQUEST(br0) 192.168.11.126 00:23:12:fa:f4:85 
Jun 23 09:20:13 dnsmasq-dhcp[5912]: DHCPACK(br0) 192.168.11.126 00:23:12:fa:f4:85 airex-n
 
Last edited:
The DHCP problem with iOS was resolved some time back. And that problem was more related to not-releasing IP addresses when the device when to sleep - Duke uses a very dynamic pool of addresses, and as soon as the lease expires, they assigned that address to another user.

Anyways - looking at your logs, your DHCP server is having problems - dnsmasq-dhcp is not the airport

perhaps a firewall rule is blocking the ack's

Can you go a bit more into detail about the rest of the network setup?

sfx
 
I'd also add that it's not just your iOS devices having issues - there's a MacBookAir, a Brother Wireless Printer, what looks be a NAS box, and your AirPort Express, along with an Apple TV.

The Duke bug was iOS specific.

Again, this strongly suggests a problem with the dnsmarq daemon - the requests are coming in from the clients, but it looks like they're not actually getting the DHCP acks...

try a reset perhaps and go from there?
 
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