no mDNS message respond with iOS9

One small software was using mDNS message to get my iphone or ipad devices' ns record which by giving the device's ip to get the device's name.

Huh. The

ns

record is part of DNS’s delegation infrastructure so I’m at a loss as to how you’d like is to get the device’s name. Please explain that in more detail.

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—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Hi eskimo, thanks for the reply.

What I did was to sending mDNS broadcast message within the local network, which is the request for a address-to-name translation.

My iphone and ipad with iOS8 will respond to the mDNS request properly while iOS9 devices don't respond to the request at all with the same network configuration.

Just want to know if this is a intended behavior or just some bug. Thanks a lot.

What I did was to sending mDNS broadcast message within the local network, which is the request for a address-to-name translation.

But that’s a

PTR

record, not an

NS

record, right?

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Oh, yes, you are correct, that's what I'm looking for, the PTR record with the host name.

My iphone with iOS9 could not respond to this kind of request while iOS8 is working properly.

Do you know what's going on here? Is it a bug or is it intended to do so?

Thanks!!

Traditionally the Bonjour implementation on iOS has not registered

A

,

AAAA

or

PTR

records for the device’s name unless there’s a service registered on that device. This is in contrast to OS X, where those records are always registered.

So, for example, if you have an Mac called “What Are The Civilian Applications?”, the system will automatically register

A

and

AAAA

records for

what-are-the-civilian-applications.local.

and a

PTR

record for the

xxx.in-addr-.local.

(where

xxx

is the primary IP address, reversed) that points to

what-are-the-civilian-applications.local.

. In contrast, an iOS device will only register those records if you start a service on that device.

Assuming you don’t have a service registered on your iOS device, the iOS 9 behaviour is correct and the iOS 8 behaviour is weird. It’s probably one of those places where

discoveryd

didn’t quite get things right.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"