On Dec 14, 2007 4:11 PM, Milton Calnek <milton@xxxxxxxxxx> wrote:
> Brian wrote:
> >
> > On Dec 14, 2007, at 3:21 PM, Les Mikesell wrote:
> >
> >> Jerry Geis wrote:
> >>> I have a device on my network that is not DHCP and I dont know the IP
> >>> address of it
> >>> and it has not method of finding it or changing it unless you know
> >>> the IP address (setable by browser).
> >>> Is there a way on linux, based on MAC address, to get the IP of the
> >>> unit?
> >>
> >> You accumulate a table of mac<->ip assocations, but only after
> >> communicating with something. arp -a will show the current entries
> >> (which expire fairly quickly). You might ping everything in the
> >> network range, then look for the mac in the arp list.
> >
> > to ping every address, check out broadcast pings here
> >
> > http://www.macworld.com/article/53277/2006/10/pingfind.html
> > (or google other how-to's)
>
> The tool you want is fping. It's available from the rpmforge repository.
>
> fping -ga 192.168.c.d/m
> arp -n | grep aa:bb:cc:dd:ee:ff
>
> Now you may have two problems:
> 1. The unknown device is not in your address space. ie: your net is
> 192.168.0.0/24 and the ip of the device is 192.168.1.1.
> 2. Your mask is too large. ie: 192.168.0.0/20 may be too large for you
> to scan the entire address space before your arp tables runs out of room.
>
> Good luck.
>
> --
> Milton Calnek BSc, A/Slt(Ret.)
You can sacrifice a little bit of speed (this is not parallel) at the
advantage of not having to install another package by doing something
like this (using bash):
for ((i=1; i<=254; i+=1))
do ping -c 5 192.168.1.$i
done
OR
for ((i=1; i<=254; i+=1))
do for ((j=1; j<=254; j+=1))
ping -c 5 192.168.$i.$j
done
done
You can probably get parallel by adding an "&" to the end of the ping line
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