[Boost-users] [asio] iPad: resolver fails on a "fresh" 3G

Subject: [Boost-users] [asio] iPad: resolver fails on a "fresh" 3G
From: ÇÇ־ǿ (qiaozhiqiang_at_[hidden])
Date: 2011-05-18 21:10:15

Switch "airplane mode" off and on does not establish a "3G connection". 

You may active a PDP context before call tcp::resolver::query(connect internet)..

> Moreover, it seems that if I try the above query several times, it
> succeedes after a while.
Maybe iOS active a PDP context for you when you first use the TCP protocol, so
You will wait and re-try.

You can compare the IP of iPad after switch "airplane mode" off and on and after open the browser.

 
> Message: 3
> Date: Wed, 18 May 2011 16:03:41 +0300
> From: Igor R <boost.lists_at_[hidden]>
> To: boost-users_at_[hidden]
> Subject: [Boost-users] [asio] iPad: resolver fails on a "fresh" 3G
> 	connection
> Message-ID: <BANLkTimVfGrDNVXME4VbfPqn-zJsOUOXQg_at_[hidden]>
> Content-Type: text/plain; charset=UTF-8
> 
> Hello,
> 
> I admit this is probably not a pure ASIO question, but perhaps someone
> already encountered the following issue (boost 1.46, iOS4.3).
> 
> When trying to resolve a host name just after 3G connection is
> established (eg., switch "airplane mode" off and on), I get the
> following error: "Host not found (authoritative)".
> The query looks like this:
> tcp::resolver::query query(tcp::v4(), "my.host.com", "9988");
> 
> On the other hand, if prior to the above query I open the browser or
> some other application that connect to the Internet, then the query
> works correctly.
> Moreover, it seems that if I try the above query several times, it
> succeedes after a while.
> 
> Another interesting point: all the above occurs with 3G connection
> only, while with WiFi everything works well.
> 
> What's could be the reason of such a weird behavior?
> 
> Thanks.
> 
>