如何在 .net 中为网络适配器设置 dns 搜索后缀？

Question

I've written a command line utility that detects which network interface is connected, and sets the staitc ip address and dns servers for it (by calling netsh). However, I can't seem to figure out how to set the dns search suffixes. netsh doesnt appear capable of doing that. How do I do that otherwise (WMI perhaps)?

Answer 1

I think you have to set the value(s) you want in the DNSDomainSuffixSearchOrder property of the Win32_NetworkAdapterConfiguration WMI object.

Here's and example of setting values in WMI, if you need it: Modifying Objects & Running Methods

Answer 2

The dns search suffixes are valid for the whole machine, not for a single network adapter. You can also get them from registry:

string searchList = "";
try 
{
    using (var reg = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(tcpSettingsSubKey))
    {
        searchList = (reg.GetValue("SearchList") as string);
    }
}
catch(Exception ex)
{
    // something went wrong
}

(This is not the default dns suffix when the machine is an AD member)