Re: Determine IP Adrress from MAC Address
Joe Pfeiffer <pfeiffer@cs.nmsu.edu> writes:
> Muntasim-Ul-Haque <tranjeeshan@inventati.org> writes:
>
>> Hi,
>> How can I determine the IP address if I already have the MAC address
>> or Hardware Address? What is the most convenient way?
>>
>> -Muntasim Ul Haque
>
> The fact that you already have the MAC address doesn't matter in finding
> out your IP address.
>
> ifconfig will give you both the MAC address and IP address of all your
> network interfaces:
>
> snowball:593$ ifconfig
> eth0 Link encap:Ethernet HWaddr d4:3d:7e:01:8c:8f
> inet addr:192.168.13.2 Bcast:192.168.13.255 Mask:255.255.255.0
> inet6 addr: fe80::d63d:7eff:fe01:8c8f/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:75979320 errors:0 dropped:0 overruns:0 frame:0
> TX packets:79860948 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:26691502625 (24.8 GiB) TX bytes:34703381554 (32.3 GiB)
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> inet6 addr: ::1/128 Scope:Host
> UP LOOPBACK RUNNING MTU:65536 Metric:1
> RX packets:590910 errors:0 dropped:0 overruns:0 frame:0
> TX packets:590910 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:38390044 (36.6 MiB) TX bytes:38390044 (36.6 MiB)
>
> So eth0 (my ethernet card) has IP address 192.168.13.2, and lo (the
> loopback "device", used for programs on my machine to talk to other
> programs on the same machine) has 127.0.0.1 -- it's actually always
> 127.0.0.1
>
> If you have network devices that aren't configured at the moment,
> ifconfig -a will tell you about them too (but they won't have IP
> addresses).
Ah, re-reading: when you said "the" MAC address, my previous response
was based on the assumption that you meant "your" IP address. If you
need the IP address of some other machine, arping should give it to you.
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