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Getting the IP address From know MAC and Switch Port

Posted on 2006-11-29
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I have a Catalyst 4006 switch with version 12.2 IOS and for some reason I cannot get the IP associated with the MAC.  I did "show arp" and it only return 12 addresses and I know there are more because there are 192 FastEthernet and 16 Gigabit Ethernet interfaces on this unit.  I even tried to input "mac address-table addr 000c.cef7.d9fd" and even though I know this is the MAC because I did a "show int fa 6/30" and it gave me all the stats on this intercase.  All I need to know is the IP address because my windows DHCP server does not have this MAC.
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Question by:jperrygodfrey
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by:guardsman85
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What kind of device is plugged into that interface?
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by:jperrygodfrey
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It is a D-link wireless printer connection, and I can find this IP by accessing the config of this devices and I since I do not have the admin password resetting the device will not show me the IP.   This is also a general question because I have never been able to get a full IP address list from my 4006.  I have only been able to get the MACs.
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guardsman85 earned 125 total points
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OK, so if I understand you correctly, you are trying to find the IP address of the D-link device.  Please correct me if I'm wrong.

The MAC address you listed is a Cisco Systems device (you can look up the manufacturer by MAC address at several sites online.  See http://www.coffer.com/mac_find/?string=000c.cef7.d9fd), so perhaps that's the MAC for the switch port.  Switches do not have an IP address assigned because they are on the datalink layer (layer 2) of the OSI model.  In other words, your switch sends packets to the MAC address of hosts on your LAN and not to the host's IP address.  This is why ARP requests must be sent to resolve IP address with MAC addresses.

D-Link devices will have a MAC address that starts with the numbers listed here:
http://www.coffer.com/mac_find/?string=d-link

Can you physically inspect the D-Link device?  Often times the MAC address is printed on the device iteself.

Is the D-Link a new device, or has it been previously configured?  If it's new and still set to the manufacturer defaults, then you can probably search Google for the default password and IP address.

If the device is/has been on your network and you're positive it's functioning somewhere on your subnet then you may be able to use an IP scanner to find it.  I like SoftPerfect Netscan.  You can specify a range of IP's for it to scan and it will ping all the addresses in that range.  With a click of a button it will automatically detect the IP range for your subnet.  In the options you can set it to resolve MAC addresses.  You can get the utility here:
http://www.softperfect.com/products/networkscanner/

Please let me know if this not what you needed.




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