ARP information is not stored on Acurite Access

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  • Updated 3 months ago
Acurite Access still, like the Smart Hub, has an ARP problem.  It sends a broadcast ARP about every 10 seconds.  Most of the time this works "just fine", but I received emails this morning that each of my sensors were down.  Actually, it was the Acurite Access that would no longer respond to its DHCP IP address.  I was able to get the Access back up through a long series of steps each of which may or may not have solved the problem.  However, rebooting the Access and the router had no effect.  When I sent a ping from a Mac connected to the hardwired ethernet (ie not over the WLAN), connectivity was restored.  I'm guessing that this is because the Mac on the Hardwired ethernet was able to get an ARP request to the Access that was returned over the Hardwired Ethernet when ARPs across the WLAN would not be returned.  

In both cases, the ARP packets had to traverse both a TP-Link switch and an Apple Airport.  


I set up port mirroring on the TP-Link switch to show the frequency of the Access ARPs and that the Apple Airport was responding to them.  NOTE: that the Access ARPs are all broadcast which could possibly explain why some people have suffered Internet outage depending on whether or not they have a switch set up that appropriately determines the spanning tree.

09:15:55.795975 24:c8:6e:0a:50:2f (oui Unknown) > Broadcast, ethertype ARP (0x0806), length 60: Request who-has 10.0.1.1 tell 10.0.1.39, length 46
09:15:55.796174 90:72:40:0c:8c:9f (oui Unknown) > 24:c8:6e:0a:50:2f (oui Unknown), ethertype ARP (0x0806), length 60: Reply 10.0.1.1 is-at 90:72:40:0c:8c:9f (oui Unknown), length 46

09:15:56.652585 24:c8:6e:0a:50:2f (oui Unknown) > Broadcast, ethertype ARP (0x0806), length 60: Request who-has 10.0.1.1 tell 10.0.1.39, length 46
09:15:56.652851 90:72:40:0c:8c:9f (oui Unknown) > 24:c8:6e:0a:50:2f (oui Unknown), ethertype ARP (0x0806), length 60: Reply 10.0.1.1 is-at 90:72:40:0c:8c:9f (oui Unknown), length 46
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John Zwiebel

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Posted 3 months ago

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