Well sometimes we must find an IP from a MAC address, but how?
I found a cool and easy way to query my CISCO switches/routers and get the information I need.
First let me explain a bit of the topology, lets suppose:
SERVERS -> Gi0/1 -> CISCO SWITCH(1) -> CISCO-BACKBONE(2) -> INTERNET
Considering these network and that we have access to all routers.
On (1):
Get all interfaces behind a port
# show interfaces status | include connected
get MAC behind Each Port
#show mac-address-table
In the cisco (2)
# show ip arp vrf GENERIC | include <MAC>
It shuold print out the IP, do NSLOOKUP and now you also have the Hostname.
System Administrator