Multi
Casting is Very Important in application Servers in transferring
Heart Beat messages. We need to make sure whether multi casting is
enabled on the Operating System before configuring any Servers
In
order to check whether multicast is enabled to a IP address :
[root@vx111a
fontconfig]# ifconfig
eth0
Link encap:Ethernet HWaddr 78:AC:C0:B1:7B:BD
inet
addr:xxx.xx.xx.xx Bcast:xxx.xx.xx.xx Mask:255.255.254.0
xxxxxxxxxxxxxxxxxxxxxxxxxxx
UP
BROADCAST RUNNING MTU:1500 Metric:1
xxxxxxxxxxxxxxxxxxxxxxxxxxx
In
the above Output during the 'UP BROADCAST RUNNING MTU:1500
Metric:1” ,we will see MULTI CAST if that is Enabled. Since it is
not available in the above output the multi cast is disabled.
To
Enable that use “ifconfig eth0 multicast” command and see
[root@vx111a
fontconfig]# ifconfig
eth0
Link encap:Ethernet HWaddr 78:AC:C0:B1:7B:BD
inet
addr:xxx.xx.xx.xx Bcast:xxx.xx.xx.xx Mask:255.255.254.0
xxxxxxxxxxxxxxxxxxxxxxxxxxx
UP
BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
xxxxxxxxxxxxxxxxxxxxxxxxxxx
We
can see that the MULTI Cast is Now Enabled.
In
Order to Disable it use “ifconfig eth0 -multicast”.
More
TO Come , Happy learning :-)
