Why is AppleTV trying to take my IP address?

I think this is somehow related to your appleTV thinking your computer is still asleep, when it is actually awake. The apple TV is trying to answer to your computer's IP for you, causing the conflict. I'm having similar issues, seems new since the yosemite upgrade. Any actual experts would be welcome to weigh in with a solution.

PS: https://en.wikipedia.org/wiki/Bonjour_Sleep_Proxy

BTW - have you started having trouble with the "computers" pane of your apple TV? I imagine that the home sharing feature is the reason for the sleep proxy, and it's been very unreliable for me since the 10.10 upgrade.

Just wanted to chime in with a "me too". There's been a lot of reports of problems with WiFI since Yosemite came out... wonder how many of those people have an Apple TV.

I too, after seeing this issue set both my macbook and the AppleTV to specific addresses (outside of the usual DHCP range in my router), and yet I'm still getting lots of lines like this in my console:

10/28/14 8:55:41.000 AM kernel[0]: en1 duplicate IP address 192.168.1.80 sent from address 58:55:ca:29:ec:XX

10/28/14 8:55:41.551 AM configd[28]: DHCP en1: defending IP 192.168.1.80 against BonjourSleepProxy 58:55:ca:29:ec:XX 3 (of 5)

... and this has happened several times now as I was actively using the Macbook.

if the Apple TV is off as in you pulled the plug then it has no IP so that would imply that the issue is with the hdcp of the router rather then the Apple TV

Do you have no problem because it is no longer plugged in at all or because it seemed to fix itself when you plugged it back in.

Does that mean the problem re-occurs if you plug it back in, have you restarted the router, are you using any airport base stations.

Well I've been fighting this and blaming the router for the last month and just started going through my syslog and I also see the:

kernel[0]: en1 duplicate IP address 192.168.1.152 sent from address 58:55:ca:1e:xx:xx (which is my appletv)

When this happens my MBP is pretty much useless on the network. The only way to fix it was to turn off and on wifi. This started when I installed yosemite.

Have you updated to 10.10.1 yet, you might also try restoring any Airport base stations you are using. I'm not absolutely sure but this could be related to the duplicate/multiple address that started with Yosemite, some have reported success with those steps but I'm not ablr to confirm this.

Duane wrote:

Both Macs are updated to 10.10.1. I do not have any AirPort base stations.

The problem is with Apple's Bonjour Wake on Demand Sleep Proxy, see About Wake on Demand and Bonjour Sleep Proxy - Apple ....

The thing is you don;t need to have an Airport router, if there is no Airport router then the Apple Tv will take over the function of handling this.

See Shared name of Mac keeps changing for a discussion of the problem that some of us have been experiencing since Yosemite came out. It appears that 10.10.1 fixed the problem (at least for me) but after a week of no name changes it appears to have happened again but I can;t be sure something else did;t trigger it.

One thing to keep in mind that while it is annoying it does not usually cause the network to malfunction, at least that was true in my case. Hopefully Apple is looking into this and a permanent solution will be released.

regards