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12.16.2007 at 11:33AM PST, ID: 23026654
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Need an IP address from a known MAC address Windows 2003

Tags: address, mac, ip, from, known
We are trying to find IP adresses for some computers and all that we have is the MAC address we got from using show mac from our Cisco switch.

Is there a way to find the IP address of the machine with only knowing the MAC address? Any help would be appreciated.
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Question Stats
Zone: Networking
Question Asked By: WilliamK99
Solution Provided By: pseudocyber
Participating Experts: 4
Solution Grade: A
Views: 95
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12.16.2007 at 11:53AM PST, ID: 20481464

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12.16.2007 at 02:36PM PST, ID: 20481921

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12.16.2007 at 05:35PM PST, ID: 20482364

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12.16.2007 at 08:39PM PST, ID: 20482948

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12.18.2007 at 09:40AM PST, ID: 20493853

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12.16.2007 at 11:53AM PST, ID: 20481464
In short..the answer is no

The reason is that while a MAC address is a fixed address that never changes for a specific device (note it is possible to clone a MAC address, thereby making one device appear to be another) an ip address is only temporarily assigned to a specific device (could be minutes, days, or years)

You say you saw the MAC address from your Cisco switch, I would think it would have a record of the ip address of devices connected as well, but we would have to know what specific hardware you are using to give more information.  If this is on a LAN, there may be a router that is assigning IP addresses using DHCP (Dynamic Host Configuration Protocol) or the IP address could be set to a fixed value from the client side, just depends on your particular setup, there can also be both on the same network.
 
12.16.2007 at 02:36PM PST, ID: 20481921
Hi
On a cisco router, the command is "show arp" - it will give you a listing of the MAC addresses and their corresponding IP address.  On a windows box, from a DOS prompt you can type "arp -a" to see similar output.

Allso its possible to see the corresponding ip/mac address in the dhcp scope of your dc.
 
12.16.2007 at 05:35PM PST, ID: 20482364

Rank: Master

Agree - look at the arp table of the default gateway.

On some xNix (unix, linux, etc.) machines, there is a Reverse ARP utility you could try, if you have one handy.  ARP table is your best bet.
 
12.16.2007 at 08:39PM PST, ID: 20482948
I've performed the following on our switches, you can find which interface the ARP came from:

slp1core01#sh arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  10.101.64.1             -   000c.ce95.347f  ARPA   Vlan299
Internet  10.64.2.1              46   00d0.97c9.901d  ARPA   FastEthernet5/47
Internet  10.64.2.2               -   000c.ce95.347f  ARPA   FastEthernet5/47
Internet  10.64.2.5               -   000c.ce95.347f  ARPA   FastEthernet5/48
Internet  10.64.2.6             190   0001.c921.0400  ARPA   FastEthernet5/48
Internet  10.101.32.1             -   000c.ce95.347f  ARPA   Vlan299
Internet  10.101.48.1             -   000c.ce95.347f  ARPA   Vlan299
Internet  192.168.1.1             -   000c.ce95.347f  ARPA   Vlan1


And if you have the MAC address the following will also find the interface that is on:

slp1core01#sh mac-address-table
Unicast Entries
 vlan   mac address     type        protocols               port
-------+---------------+--------+---------------------+--------------------
   1    000c.ce95.347f    static ip,ipx,assigned,other  Switch              
   1    0012.f013.ae44   dynamic ip,other               FastEthernet5/6    
   1    0013.0231.b5cc   dynamic ip                     GigabitEthernet3/10
   1    0013.ba11.10ac   dynamic ip                     GigabitEthernet3/4  
   1    0013.ba11.14c0   dynamic ip                     GigabitEthernet3/1  
   1    0013.ba11.14c4   dynamic ip                     GigabitEthernet3/6  
   1    0013.ba11.14e0   dynamic ip                     GigabitEthernet3/7  
   1    0013.ba11.14e4   dynamic ip                     GigabitEthernet3/5  
   1    001b.771a.7715   dynamic ip,ipx                 GigabitEthernet3/6

Of course if these are large networks on each interface finding the actual device will prove difficult.

 
12.18.2007 at 09:40AM PST, ID: 20493853

Rank: Master

hint for you guys

Put in the a portion of the IP, or the MAC that is unique that you're looking for and search only on that unique portion.  So, for the above, let's say you wanted to find 0013.0231.b5cc, you could do it like this:

show mac-address table | inc bc55

Note - the "inc" above is enough of a unique command - the full command is "include".

In the ARP table, you could type it like this:

show arp | inc 10.64.2.5

You can use the pipe include to search through any output - useful for arp and mac table - but also for show interface status, show run, etc.

You can also tell your results to beging at a certain line by typing a "begin"

Like:

show run | begin eth 0/0

The begin will begin at the first instance of the matching characters "eth 0/0" where as a "include" will show any line which includes those characters.

Hope this helps.
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