Cannot ping iPhone in OSX but all other hosts work. Bootcamp pings fine.

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Cannot ping iPhone in OSX but all other hosts work. Bootcamp pings fine.

Hi

I have a 3G iPhone and am having a bizarre problem with only my Mac. When I ping my iPhone (DHCP 10.0.1.100), I don't get a reply. I can ping 10.0.1.1 (router) 10.0.1.5 (SMTP server), 10.0.1.10 (mail server) and 10.0.1.6 (printer). I can reboot into bootcamp and ping my iPhone with Vista which tells me its a problem in OSX. As a test I tried to ping my wife's iPhone and my buddy's iPhone and I cannot ping those either, although he could ping them all and bootcamp pings them all fine as well. So it appears to be just iPhones that I cannot get to.

I have tried disabling the firewall on the Mac and it doesn't make a difference. Here is the strange part; If I create an ad-hoc wireless network on the mac I can then get to it just fine. This makes things like the remote app not functional unless I create an ad-hoc network and connect directly to the Mac.

Has anyone else had this problem or know how to solve it?

Thanks,

Alex

17" 2.6G MacBookPro, Mac OS X (10.5.2)

Posted on Aug 11, 2008 2:24 PM

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Answer 1

agregory Author

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Aug 22, 2008 8:18 PM in response to agregory

Nobody else is having this problem?

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Answer 2

edoras

Level 1

30 points

Sep 22, 2008 4:55 AM in response to agregory

Yes, I have the same problem.
I can ping to my Apple TV but cannot ping to my ipod or iphone.
All on the same subnet.

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Answer 3

Sep 27, 2008 11:46 AM in response to edoras

Yes I have the exact same problem, but seems to only effect the mac. My router can ping the iphone without a problem. Any solutions? Could it be caused because the mac and iphone are on the same AP?

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Answer 4

edoras

Level 1

30 points

Sep 27, 2008 5:04 PM in response to Armon Dadgar

I found out that if you have devices which have IP address between 100 to 199, you might not be able to ping...

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Answer 5

Sep 30, 2008 6:09 PM in response to agregory

I did some testing, and it is definitely a problem with the Access Point. When my macbook and iPhone are on the same Trendnet wifi access point, they cannot ping each other. If I move them (physically) to a different area, they connect to an Airport Express, and then they can ping each other. The whole time they keep their original IP's. They only thing I can conclude is that my Trendnet AP is to blame. I also read that this is called "Client Isolation" where wifi clients are separated from each other, some routers support turning the mode on or off, not mine unfortunately.

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Answer 6

Dogcow-Moof

Level 8

36,185 points

Sep 30, 2008 9:53 PM in response to Armon Dadgar

Note that many routers specifically filter out or do not pass along ICMP requests, as the protocol is not only used to "ping" hosts, but it can also be used to "ICMP flood" networks causing a denial of service.

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