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How do I find the MAC address of an IP address associated with our ASA firewall?

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Last Modified: 2018-02-06
Hello - we have Microsoft troubleshooting a DHCP-related case for us, and they're seeing traffic coming from an IP address that is tied to our ASA gateway firewall.  There are 2 subnets going thru our network, so there are 2 IP gateway IP's associated with our firewall - 192.168.1.254 and 192.168.5.254.  They're asking for the MAC address of the 192.168.5.254 IP.  How do I find this?  I'm trying Experts Exchange to see if its faster than asking Cisco.  I've Googled it for 15 minutes and am not finding the answer so far.

thanks!
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