Hi,

given a host name, how can you i C# determine with 100% certainty if
it actually represents the local host? I am talking about DNS aliases
here.

I have tried the following, which seems to work in most cases. But it
unfortunately fails at a few customer installations:

public bool IsLocalHost(string hostName)
{
IPHostEntry localhost = Dns.GetHostByName(Environment.MachineName);
IPHostEntry hostInfo = Dns.GetHostByName(hostName);
foreach (IPAddress localhostAddress in localhost.AddressList)
{
foreach (IPAddress hostAddress in hostInfo.AddressList)
{
if (localhostAddress.Equals(hostAddress)) return true;
}
}
return false;
}

Any ideas?


Regards
Lars Fastrup
Navigo Systems
www.navigosystems.com

Have you tried Dns.GetHostName()? That should get the hostname of the local
computer.

Sujit D'Mello

"Lars Fastrup" wrote:

> Hi,
>
> given a host name, how can you i C# determine with 100% certainty if
> it actually represents the local host? I am talking about DNS aliases
> here.
>
> I have tried the following, which seems to work in most cases. But it
> unfortunately fails at a few customer installations:
>
> public bool IsLocalHost(string hostName)
> {
> IPHostEntry localhost = Dns.GetHostByName(Environment.MachineName);
> IPHostEntry hostInfo = Dns.GetHostByName(hostName);
> foreach (IPAddress localhostAddress in localhost.AddressList)
> {
> foreach (IPAddress hostAddress in hostInfo.AddressList)
> {
> if (localhostAddress.Equals(hostAddress)) return true;
> }
> }
> return false;
> }
>
> Any ideas?
>
>
> Regards
> Lars Fastrup
> Navigo Systems
> www.navigosystems.com
>