TCP/IP computer networks use both the IP addresses and MAC addresses of connected client devices. For Multicast IP Address, the first 4 bits are fixed, these first four bits are 1110.The last 23 bits are used for Multicast MAC Address.And the remainning 5 bits in the middle can be any value. HowTo: Find switchport for a MAC Address on a Cisco Catalyst Switch If you have a big network with multiple Access Switches connecting to the core switches or routers then tracing a device like a PC or a laptop for troubleshooting or security purposes is one of those tasks that you often end up doing. For our example, the Multicast IP addresses that share the same Multicast MAC Address are showed below. While the IP address changes over time, the MAC address of a network adapter always stays the same. and they worked around the Vlan assignment by configuring the NVR with an interface to the default staff Vlan but with an IP address of the CAM Vlan. 4. switch# show mac-address-table | include 0009.aabb.06e9. With the above command, one can figure out which Mac address is on which port of catalyst switch. If you are looking for your MAC address, it will be listed in this sub-menu as the third listing. If you know the IP address of the device then try to ping it from within the switch. Next "telnet " and you get the menu of the jetdirect and can read what it's stored IP address is. You will see something like Duplicate address 10.25.32.15 on Vlan25 sourced by 0011.2233.4455 and there will be another message with the other mac address.. Then you show the mac address-table to see what port that mac address is connected to.show mac-address-table address 0011.2233.4455 When you specify the IP addresses, the switch uses Address Resolution Protocol (ARP) to associate the IP addresses with the corresponding MAC addresses and the VLAN IDs. Then delete the static arp entry and print a "help please phone IT and tell me where this printer is" message to it. This command will show the MAC address of the device. In Cisco L3 Switch Type # sh ip dhcp binding assigned . router#show ip dhcp binding | inc (mac address in format aaaa.bbbb.cccc) or alternatively you can learn it via ARP at this point (again on l3 switch or router) router#show ip arp | inc (mac address in format aaaa.bbbb.cccc) If you get a mac-address but still are unable to get an IP your next step would likely be to use a PCAP tool like wireshark. Do "show log". Pinging local IP addresses will give you the MAC-address, but pinging remote hosts won't. The traceroute mac ip command output shows the Layer 2 path when the specified source and destination IP addresses are in the same subnet. here u need to find exact mac address which is might be start with 01 or 11 . TB-CS … Generally an IP address conflict is logged. If you want to obtain your IP address, then you will need to select option 1 listed as IPv4 Configuration. IP Address. The ARP table on these devices will contain the compliance of the MAC and IP addresses. or if you know the mac address and want to know which port the mac address is coming from, use the following command. If the device is pingable, then do a simple sh ip arp command. Correct, with "local" meaning "on the same LAN". It’s possible if you have access to a Cisco router or Cisco ASA firewall which is the default host gateway. Using ARP, each local network interface tracks both the IP address and MAC address for each device it has recently communicated with. These commands will help you to work faster. 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