问题
According to Dotnet reference ,
Dns.GetHostAddresses("")
should return IPv4 addresses . However I am getting only IPv6 on my windows 7 machine. I tried the program on a different windows 7 still the same result. It only returned IPv4 correctly on an XP machine.
If I try ,
Dns.GetHostEntry("");
It now correctly returns one IPv4 and one IPv6 . How do I get IPv4 from GetHostAddresses() because I don't want to use GetHostEntry(). It looks up the DNS.
Also, say for a computer with 1 Network card, the code returns an array of 2 identical IPv6 . Is this normal ?
回答1:
This works for me:
IPHostEntry ipHostEntry = Dns.GetHostEntry("example.com");
IPAddress ipAddress = ipHostEntry.AddressList.First(a => a.AddressFamily == AddressFamily.InterNetwork); // ipv4
It's normal to have two ipv6 addresses, one which contains your MAC address which guarantees its uniqueness, and another which doesn't to increase your privacy/security. But I don't know why yours would be identical.
来源：https://stackoverflow.com/questions/18369759/dns-gethostaddresses-only-returns-ipv6-addresses-how-to-get-local-ipv4