Forum Discussion
jachbr214
Nimbostratus
NimbostratusDisplay mac address of connected server
Is there a quick way to find out the mac address of the connected server on each port. arp -a only shows the vlan that it is on. I would like to find the actual interface. Example what is the mac address of the server plugged into 1.2 on the LTM.
Thank you
- I am not quite sure what you are asking. If you are looking for the MAC address associated with an interface on the BIG-IP, the bigpipe command:
bigpipe interface show all
If you are looking for MAC addresses connected downstream from the BIG-IP, I don't think there is a command to handle this.
bigpipe arp show
Will give you devices in the arp table but this is on a VLAN level. You could tcpdump on the interface and then use a program like wireshark to view the MAC addresses, but this may be tedious. Here is an example:
tcpdump -ni 1.1 -w /var/tmp/interface1_1.pcap
Please be aware the tcpdump can use resources and unfiltered captures can grow quite large. If you are only looking for MAC address, I would suggest running tcpdump on a standby BIG-IP. 
hoolioCirrostratus
You could also check the output from 'b conn all show all' to get a list of the connection table entries and the respective MAC addresses. arp -a will show the arp cache and the VLAN it was learned on. As mkahler pointed out, both of these options show the VLAN, not the physical port.
Aaron
