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2 mac address response for arping (Dell 8024 and 6248 switches)
I just want to check is it normal to have 2 mac address response if I arping? In the attached screenshot the machine 192.168.123.201’s real MAC address is 00:15:f9:58:0b:87, however I noticed that the 5c:26:0a:fb:bc:87 (our Layer 3 switch MAC) is also replying. Is this normal? I am doing arping in my server which is in the Layer 2.
Our network set-up is L3 (Dell PowerConnect 8024) connected to 3 Dell PoweConnect 6248 (in a stack).
charoline18
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September 23rd, 2014 21:00
here's the arping result:
# arping 192.168.123.201
ARPING 192.168.123.201
60 bytes from 5c:26:0a:fb:bc:87 (192.168.123.201): index=0 time=1.513 msec
60 bytes from 00:15:f9:58:0b:20 (192.168.123.201): index=1 time=1.660 msec
60 bytes from 5c:26:0a:fb:bc:87 (192.168.123.201): index=2 time=437.021 usec
60 bytes from 00:15:f9:58:0b:20 (192.168.123.201): index=3 time=967.026 usec
60 bytes from 5c:26:0a:fb:bc:87 (192.168.123.201): index=4 time=448.942 usec
60 bytes from 00:15:f9:58:0b:20 (192.168.123.201): index=5 time=989.914 usec
60 bytes from 5c:26:0a:fb:bc:87 (192.168.123.201): index=6 time=577.927 usec
60 bytes from 00:15:f9:58:0b:20 (192.168.123.201): index=7 time=1.113 msec
60 bytes from 5c:26:0a:fb:bc:87 (192.168.123.201): index=8 time=699.043 usec
60 bytes from 00:15:f9:58:0b:20 (192.168.123.201): index=9 time=2.765 msec
60 bytes from 00:15:f9:58:0b:20 (192.168.123.201): index=10 time=4.589 msec
60 bytes from 5c:26:0a:fb:bc:87 (192.168.123.201): index=11 time=13.653 msec
60 bytes from 5c:26:0a:fb:bc:87 (192.168.123.201): index=12 time=584.126 usec
Anonymous
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September 24th, 2014 08:00
I am not sure why arping would return two MACs like that. From the switches if you performing the command #show arp switch, do the MAC and IP addresses show up accordingly?
charoline18
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September 25th, 2014 04:00
Hi Daniel,
Yes from the switch's ARP it is showing the correct MAC address for that IP. Under normal circumstances arping should only reply 1 mac address right?
Anonymous
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September 25th, 2014 12:00
The situations i have seen the arping command returns one MAC. Is the server in the same VLAN as 192.168.123.201?
What is the output if we run this command.
$ sudo arping -D 192.168.123.201
If you plug the server into the same switch as the client, does that change the output at all?
What are you using this command for?