System.Net.Dns.GetHostByAddress returns incorrec t Hostame

  • Thread starter Thread starter Sven
  • Start date Start date
S

Sven

Hi!

I have a problem with

System.Net.Dns.GetHostByAddress(ls_Request.UserHostAddress()).HostName

Usually the call GetHostByAddress returns the correct hostname of the
client, but sometimes I get a hostname like _CERDR1342B88E.
Why? The clients are running under Windows CE.NET 4.1...

Sven
 
Sven said:
Hi!

I have a problem with

System.Net.Dns.GetHostByAddress(ls_Request.UserHostAddress()).HostName

Usually the call GetHostByAddress returns the correct hostname of the
client, but sometimes I get a hostname like _CERDR1342B88E.
Why? The clients are running under Windows CE.NET 4.1...

Sven
Click to expand...

What happens if you probe a ip address that returns such a name op port 445?
Is it open? If so, the computername is returned and not the hostname.

Someone with more knowledge of the tcp/ip system could clear this out.

//Rutger
 
You should post this to the
microsoft.public.dotnet.framework.compactframework group.

feroze
==============
this posting is provided as-is.
 
Well, the call System.Net.Dns.GetHostByAddress is executed on a
Windows 2003 Server... and i want to get the hostname of an IP address
(from a Windows CE system). I don't know if the behaviour is specific
to CE...
 
Rutger Smit said:
What happens if you probe a ip address that returns such a name op port 445?
Is it open? If so, the computername is returned and not the hostname.

Someone with more knowledge of the tcp/ip system could clear this out.

//Rutger
Click to expand...

I looked up the computername on the windows ce machines, but the
computername is the one we set initialy (not _CERDR1342B88E)! But the
call System.Net.Dns.GetHostByAddress returns _CERDR1342B88E. I don't
know what the call System.Net.Dns.GetHostByAddress exactly does, but
it does not seem to be right.

Since the hostname is not really _CERDR1342B88E, i think a probe on
port 445 does not make sense...

Sven
 
Sven said:
I looked up the computername on the windows ce machines, but the
computername is the one we set initialy (not _CERDR1342B88E)! But the
call System.Net.Dns.GetHostByAddress returns _CERDR1342B88E. I don't
know what the call System.Net.Dns.GetHostByAddress exactly does, but
it does not seem to be right.

Since the hostname is not really _CERDR1342B88E, i think a probe on
port 445 does not make sense...

Sven
Click to expand...


It looks like GetHostByAddress does NOT always do a reverse lookup. Ik
don't know what is doe. Try to analyze the network logs that can be
caputred using Ethereal.

The port 445 suggestion was becaus of the computername, but it doens't
have anything to do with it.

//Rutger
 
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