Fix multicast SDN example.

dceara · dceara · commit 1c04ae07c765 · 2020-08-17T20:59:54.000+02:00
In case of ovn-kubernetes, if the multicast receiver and sender PODs are
on different nodes, the multicast traffic is routed. Change the example
to reflect that the TTL of test packets should be changed from the
default value of 1.

Signed-off-by: Dumitru Ceara &lt;dceara@redhat.com&gt;
diff --git a/modules/nw-enabling-multicast.adoc b/modules/nw-enabling-multicast.adoc
@@ -121,7 +121,7 @@ $ CIDR=$(oc get Network.config.openshift.io cluster \
 [source,terminal]
 ----
 $ oc exec msender -i -t -- \
-    /bin/bash -c "echo | socat STDIO UDP4-DATAGRAM:224.1.0.1:30102,range=$CIDR"
+    /bin/bash -c "echo | socat STDIO UDP4-DATAGRAM:224.1.0.1:30102,range=$CIDR,ip-multicast-ttl=64"
 ----
 +
 If multicast is working, the previous command returns the following output:

Original file line number	Diff line number	Diff line change
`@@ -121,7 +121,7 @@ $ CIDR=$(oc get Network.config.openshift.io cluster \`
`121`	`121`	`[source,terminal]`
`122`	`122`	`----`
`123`	`123`	`$ oc exec msender -i -t -- \`
`124`		`- /bin/bash -c "echo \| socat STDIO UDP4-DATAGRAM:224.1.0.1:30102,range=$CIDR"`
	`124`	`+ /bin/bash -c "echo \| socat STDIO UDP4-DATAGRAM:224.1.0.1:30102,range=$CIDR,ip-multicast-ttl=64"`
`125`	`125`	`----`
`126`	`126`	`+`
`127`	`127`	`If multicast is working, the previous command returns the following output:`