Re: Dns.GetHostEntry functionality

I dont have a non-WinMo CE device.

"Chris Tacke, eMVP" <ctacke.at.opennetcf.dot.com> wrote in message news:uZCtjt6hIHA.6032@xxxxxxxxxxxxxxxxxxxxxxx
I'd try it with a generic, non-WinMo CE device with full networking components and see if it behaves differently. That would tell you if it's WinMo specific or a larger problem.


--

Chris Tacke, Embedded MVP
OpenNETCF Consulting
Giving back to the embedded community
http://community.OpenNETCF.com

"David" <david@xxxxxxxxxxx> wrote in message news:92D8B9D5-84CD-416C-A015-C62BC70D43E1@xxxxxxxxxxxxxxxx
I have a Windows Server 2008 machine, non-domain server. It is a DHCP server as well as a DNS server. All of my computers and devices get their ip addresses from the 2008 DHCP server. All PCs can resolved names using the C# code snippet. It is only the device that cannot resolve the name. The server and computers and devices (via WiFi access point) are all connected together through switches. None go through a router. The router is connected to the cable modem to the internet, but the router has DHCP turned off. The Access points have DHCP turned off as well so there will be no confict (only one dhcp server allowed on a network).

"Simon Hart [MVP]" <srhartone@xxxxxxxxx> wrote in message news:88BF106F-5347-4C0E-A5C8-E2420AF1659D@xxxxxxxxxxxxxxxx
That's probebly because you don't have a local DNS server. Generally if you
don't have a network server you normally will not have a DNS server. For
example my network here has a W2003 Server box with AD configured, I am able
to resolve machine names via my device the same is true in my office at work.

If you've got a router and modem with DHCP (most have DHCP now) and your pc
hangs off that, you will not be able to resolve machine names. You can
resolve internet names because the modem will know the internet DNS server
but of course this server will not be able to resolve local names.
--
Simon Hart
Visual Developer - Device Application Development MVP
http://simonrhart.blogspot.com


"Paul G. Tobey [eMVP]" wrote:

It could be used to resolve your local names, but only if those names are
stored on some local or corporate DNS server. Generally, that's not the
case in an office environment. For example, here, in my office, you can be
100% sure that DNS is not resolving the name of my machine, "FARSIDE". I've
watched the packets...

Paul T.

"David" <david@xxxxxxxxxxx> wrote in message
news:1972FECB-4AC5-47C9-B57F-C3AD926EAADA@xxxxxxxxxxxxxxxx
> DNS is absolutely used to resolve computer names. It is also used to
> resolve names on the internet too.
>
> "Paul G. Tobey [eMVP]" <p space tobey no spam AT no instrument no > spam DOT
> com> wrote in message news:e7g0u9ehIHA.1164@xxxxxxxxxxxxxxxxxxxxxxx
>> DNS isn't being used to resolve some local name. DNS is what is >> used to
>> resolve things like www.microsoft.com. There's no local service >> that
>> knows about your PC's NetBIOS name. I'm not 100% sure that NetBIOS >> names
>> like that *should* be resolved on WM5 devices. Unfortunately, I >> also
>> can't check it right now on mine. Maybe someone else knows...
>>
>> Paul T.
>>
>> "David" <david@xxxxxxxxxxx> wrote in message
>> news:5640D4EC-8A68-4111-98F0-8CE9C665DDBC@xxxxxxxxxxxxxxxx
>>> HP 2790
>>> Windows Mobile 5.0
>>> HP iPAQ Wi-Fi Adapter
>>>
>>> I have OpenNetCF installed on the device and I have used it to >>> build
>>> some code to go through the network configuration. It shows that I >>> have
>>> the correct DNS entries.
>>>
>>> "Paul G. Tobey [eMVP]" <p space tobey no spam AT no instrument no >>> spam
>>> DOT com> wrote in message >>> news:uhopxtehIHA.6136@xxxxxxxxxxxxxxxxxxxxxxx
>>>> The only thing that I can think of is that the name you're asking >>>> for
>>>> is wrong (isn't the real device name), or that there's a bug in
>>>> resolution for NetBIOS names with - characters in them. What sort >>>> of
>>>> device are we talking about (it's not Windows Mobile, for >>>> example?)?
>>>> Version of CE? Networking components built in?
>>>>
>>>> Your code works fine on my device.
>>>>
>>>> Paul T.
>>>>
>>>> "David" <david@xxxxxxxxxxx> wrote in message
>>>> news:B3DAB770-2D94-4BE6-8899-B0C51B61F484@xxxxxxxxxxxxxxxx
>>>>>I have this code:
>>>>>
>>>>> try
>>>>> {
>>>>> IPAddress[] addresses =
>>>>> Dns.GetHostEntry("david-1").AddressList;
>>>>> foreach (IPAddress address in addresses)
>>>>> {
>>>>> if (address.AddressFamily ==
>>>>> AddressFamily.InterNetwork)
>>>>> {
>>>>> m_strServeIP = address.ToString();
>>>>> break;
>>>>> }
>>>>> }
>>>>> }
>>>>> catch (SocketException ex)
>>>>> {
>>>>> MessageBox.Show(ex.Message);
>>>>> Close();
>>>>> return;
>>>>> }
>>>>>
>>>>> A SocketException is thrown "No such host is known".
>>>>>
>>>>> Yet, I know I have connectivity since I can browse the internet >>>>> and I
>>>>> have a valid ip address and it can be pinged from the david-1
>>>>> computer. My DHCP server is giving out dns and gateway >>>>> information.
>>>>> Why does the GetHostEntry fail?
>>>>
>>>>
>>>>
>>>
>>
>>
>>
>









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