Is there any way to identify cause/source of broadcast storm originating from OS X Server?
Situation: It seems the Mac Mini (2011) is now broadcasting a great deal after upgrading to OS X Server (Mountain Lion) and I am clueless on how to identify the cause or source. The moment I unplug the Mac Mini from the LAN, the broadcast storm stops.
Mac mini, Mac OS X (10.7.2)
What address is it broadcasting to? Does it have an IP address?
I am not good with Mac OS. Is there any steps or way to check that?
I am only able to identify the abnormality due to entire Cisco switch constantly blinking synchronized across all ports whenever the Mac Mini with Mountain Lion OS X Server plugs in and the port that it is connected to shows very high tranmitted packets.
Below is the stats obtained after clearing counters for less than 30 seconds. The broadcast packets seems high for <30 seconds.
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:00:37
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1200000 bits/sec, 225 packets/sec
5 minute output rate 922000 bits/sec, 139 packets/sec
2667 packets input, 520983 bytes, 0 no buffer
Received 737 broadcasts (733 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 733 multicast, 0 pause input
0 input packets with dribble condition detected
1647 packets output, 466235 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
You can check whether the Mac has an IP address in the Network preference pane. As for analyzing the traffic, that would require packet capture and the skills of a network administrator.
Broadcast Storm in OS X Server (Mountain Lion)
