如何知道一台机器是否可以用c＃ping？

Question

我想测试，如果我的机器可以通过其他网络实体ping通：

Type NetFwMgrType = Type.GetTypeFromProgID("HNetCfg.FwMgr", false); 
INetFwMgr mgr = (INetFwMgr)Activator.CreateInstance(NetFwMgrType); 
string allowed = mgr.LocalPolicy.CurrentProfile.IcmpSettings.AllowInboundEchoRequest; 

Answer 1

为了解某台机器是否可以被钉死;需要允许ICMP类型8 in和type 0 out。

public Boolean IsPingable() 
    { 
     Boolean icmpAllowed = false; 
     INetFwMgr mgr = (INetFwMgr)Activator.CreateInstance(NetFwMgrType); 
     Object allowedin8 = null; 
     Object restrictedin8 = null; 
     Object allowedout0 = null; 
     Object restrictedout0 = null; 
     mgr.IsIcmpTypeAllowed(NET_FW_IP_VERSION_.NET_FW_IP_VERSION_V4,"127.0.0.1", 0, out allowedin0, out restrictedin0); 
     mgr.IsIcmpTypeAllowed(NET_FW_IP_VERSION_.NET_FW_IP_VERSION_V4, "8.8.8.8", 8, out allowedout8, out restrictedout8); 
     if ((Boolean)allowedin0 && (Boolean)allowedout8) 
     { 
      icmpAllowed = true; 
     } 
     return icmpAllowed; 
    } 

Answer 2

您可以发送ping命令检查是否可以Ping通：

public static bool CanBePinged(string hostname) 
{ 
    if (string.IsNullOrWhiteSpace(hostname)) throw new ArgumentException("hostname"); 

    Ping p1 = new Ping(); 
    try 
    { 
     PingReply PR = p1.Send(hostname); 
     return PR.Status == IPStatus.Success; 
    }catch(Exception e) 
    { 
     return false; 
    } 
} 

Answer 3

使用System.Net.Networkinformation.Ping.Send(...)。

您可以在几个方面，包括指定主机名，在这种情况下the MSDN sample是使用Ping：

public static void SimplePing() 
{ 
    Ping pingSender = new Ping(); 
    PingReply reply = pingSender.Send ("www.contoso.com"); 

    if (reply.Status == IPStatus.Success) 
    { 
     Console.WriteLine ("Address: {0}", reply.Address.ToString()); 
     Console.WriteLine ("RoundTrip time: {0}", reply.RoundtripTime); 
     Console.WriteLine ("Time to live: {0}", reply.Options.Ttl); 
     Console.WriteLine ("Don't fragment: {0}", reply.Options.DontFragment); 
     Console.WriteLine ("Buffer size: {0}", reply.Buffer.Length); 
    } 
    else 
    { 
     Console.WriteLine (reply.Status); 
    } 
} 

，或者你可以指定一个IPAddress，在这种情况下the MSDN sample是：

public static void LocalPing() 
{ 
    // Ping's the local machine. 
    Ping pingSender = new Ping(); 
    IPAddress address = IPAddress.Loopback; 
    PingReply reply = pingSender.Send (address); 

    if (reply.Status == IPStatus.Success) 
    { 
     Console.WriteLine ("Address: {0}", reply.Address.ToString()); 
     Console.WriteLine ("RoundTrip time: {0}", reply.RoundtripTime); 
     Console.WriteLine ("Time to live: {0}", reply.Options.Ttl); 
     Console.WriteLine ("Don't fragment: {0}", reply.Options.DontFragment); 
     Console.WriteLine ("Buffer size: {0}", reply.Buffer.Length); 
    } 
    else 
    { 
     Console.WriteLine (reply.Status); 
    } 
}