1/3/2023 0 Comments Send wlisten multicast![]() ![]() ![]() Be sure to set the path of the script correctly if you not using a real app and are using $SPLUNK_HOME/etc/system/local to properly point to your script. The shell script or bat file will call your multicast listener program that will listen on an address and port. This means run this program once upon starting Splunk. The first step is to set up an nf file in one of your apps or in $SPLUNK_HOME/etc/system/local that points to your scripted input. ![]() Every time the program receives an event, it outputs an entry to standard output, which is then indexed by Splunk. Setting up a Multicast ListenerĪs an experienced Splunk user may imagine, the most straight forward way to accomplish this is to create a scripted input that starts when Splunk starts and calls a program to listen on a multicast address and port. The Splunk user can then use this for troubleshooting, building timechart graphs for trend analysis, setting up alerts, or simply to see the interval a server was down from the time it sent a packet to the next time it sent a packet. A Splunk indexer could be listening on the same multicast address and port to index this control data as it is being sent around. For instance, application servers in a cluster often are designed to send out heartbeat packets every N seconds, (typically 10 to 20 seconds) to all other servers in the cluster via multicast. Having said that, there may be cases where indexing events, such as control data, that are delivered via multicast may be useful. Since most of the machines on the LAN won’t be interested in this data, It would be a waste of network resources, not to mention potentially unreliable. If you are indexing log type events, it is not a good idea to multicast this data to all machines on the LAN just to have one Splunk indexer that is listening for it to index it. Goes ok you should see “Ping” messages sent by each client in logs of all other connected clients.Although the title of this entry says indexing events delivered by multicast, the first thing I need to point out is not to do it. To test your multicast setup you need to start server in one terminal and couple of clients in other terminals. Other functionality provided by the multicast transport includes setOutgoingInterface and setLoopbackMode – see IMulticastTransport for more information. That is, datagrams won’t traverse more than one router hop, unless a higher TTL is set with setTTL. Note that a multicast socket will have a default TTL (time to live) of 1. listenMulticast ( 9999, MulticastPingClient (), listenMultiple = True ) reactor. format ( repr ( datagram ), repr ( address ))) reactor. From import DatagramProtocol from twisted.internet import reactor class Echo ( DatagramProtocol ): def datagramReceived ( self, data, addr ): print ( "received ". ![]()
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