Patch: UdpAppender with Multicast TTL

["Riemer, Björn" <bj...@fokus.fraunhofer.de>]

Hi*,

i've enhanced the UdpAppender in such a way that you could specify the MulticastTTL value in the configuration file. 
By setting this value greater than 1 the log messages could pass routers between subnets in Multicast mode.


Index: src/Appender/UdpAppender.cs
===================================================================
--- src/Appender/UdpAppender.cs	(revision 1063197)
+++ src/Appender/UdpAppender.cs	(working copy)
@@ -284,6 +284,15 @@
 			get { return m_encoding; }
 			set { m_encoding = value; }
 		}
+		
+		/// <summary>
+		/// Gets or sets the Multicast HopLimit of the Socket.
+		/// </summary>
+		public int MulticastHopLimit
+		{
+			get { return m_multicastHopLimit; }
+			set { m_multicastHopLimit = value; }
+		}
 
 		#endregion Public Instance Properties
 
@@ -499,6 +508,15 @@
 
 				this.Client = null;
 			}
+			try
+			{
+				this.Client.Client.SetSocketOption(SocketOptionLevel.IP, 
+					SocketOptionName.MulticastTimeToLive, 
+					this.MulticastHopLimit);
+			}
+			catch (SocketException ex)
+			{
+			}
 		}
 
 		#endregion Protected Instance Methods @@ -537,6 +555,11 @@
 		/// The encoding to use for the packet.
 		/// </summary>
 		private Encoding m_encoding = Encoding.Default;
+		
+		/// <summary>
+		/// The HopLimot (MulticastTTL) of the packet.
+		/// </summary>
+		private int m_multicastHopLimit = 1;
 
 		#endregion Private Instance Fields
 	}

-----
#- Björn Riemer
#- FOKUS - Fraunhofer Institute for Open Communication Systems
#-  -Sensor Applications and Networks -
#- Kaiserin-Augusta-Allee 31
#- 10589 Berlin, Germany
#- phone: +49 30 3463-7747
#- fax: +49 30 3463-8000
#- email: bjoern.riemer@fokus.fraunhofer.de
#- http://www.fokus.fraunhofer.de