/// <summary>
/// Lookup the first IP address external to the LAN.
/// </summary>
/// <param name="ip">External host to trace too.</param>
/// <param name="maxTtl">Maximum number of hops to try.</param>
/// <param name="response">Trace route result.</param>
/// <returns>If the trace is successful.</returns>
public bool TrySearchForFirstExternalAddress(IPAddress ip, int maxTtl, out TraceRouteResponse response)
{
for (int i = 0; i < maxTtl; i++)
{
if (TryLookupInternal(ip, i, out response)) return true;
}
response = null;
return false;
}
private bool TryLookupInternal(IPAddress remoteHost, int ttl, out TraceRouteResponse response)
{
if (ttl < 1)
{
response = null;
return false;
}
if (!NetworkConnectionTracker.IsNetworkConnected)
{
ServiceRegistration.Get<ILogger>().Debug("TraceRoute: Lookup - No Network connected");
response = null;
return false;
}
try
{
using (Ping sender = new Ping())
{
PingOptions options = new PingOptions(ttl, true);
PingReply reply = sender.Send(remoteHost, 1000, new byte[32], options);
if (reply != null)
{
response = new TraceRouteResponse()
{
RemoteHost = remoteHost,
FirstResponseTtl = ttl,
FirstResponseHostname = Dns.GetHostEntry(reply.Address).HostName,
FirstResponseIP = reply.Address
};
return true;
}
}
}
catch (Exception)
{
response = null;
return false;
}
response = null;
return false;
}
