Mac address recovery
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Posted by SnaZZZ on December 17, 2004, 9:07 am
Please log in for more thread options I have a need to interrogate 24,000 networked devices in an organisation. The only piece of info I require from the device is its Mac address. Now I know a Fluke Device which is rather expensive is able to do this, but I would like to know if there is any other way. 1. Not all devices have an IP address they are on DHCP, so a ping command will not work. Once cable is removed no IP is assigned thus no Mac address. 2. Its needs to be an inexpensive way to get the Mac address either using a laptop with crossover or a PDA type device with the right adaptor 3.The recovery of the Mac address will be done by semi-skilled staff (uni students with little or no technical skill), so it needs to be easy Can anyone suggest a device or solution. Thanks in advance SnaZZZ | ||||||||||||||||||||||
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Posted by on December 17, 2004, 10:27 am
Please log in for more thread options > Guys I hope someone can help with this Query.
> I have a need to interrogate 24,000 networked devices in an organisation.
> The only piece of info I require from the device is its Mac address. > Now I know a Fluke Device which is rather expensive is able to do this, but > I would like to know if there is any other way. > 1. Not all devices have an IP address they are on DHCP, so a ping command
> will not work. Once cable is removed no IP is assigned thus no Mac address. > 2. Its needs to be an inexpensive way to get the Mac address either using a > laptop with crossover or a PDA type device with the right adaptor > 3.The recovery of the Mac address will be done by semi-skilled staff (uni > students with little or no technical skill), so it needs to be easy > Can anyone suggest a device or solution.
> Thanks in advance > SnaZZZ
snmp to your networking grear, ask for the mac-addr-table, correlate with port used. Why on earth do you need mac-address table for ? It won't be stable for many minutes ... -- Peter Håkanson IPSec Sverige ( At Gothenburg Riverside ) Sorry about my e-mail address, but i'm trying to keep spam out, remove "icke-reklam" if you feel for mailing me. Thanx. | ||||||||||||||||||||||
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Posted by Walter Roberson on December 17, 2004, 11:08 am
Please log in for more thread options :I have a need to interrogate 24,000 networked devices in an organisation.
:The only piece of info I require from the device is its Mac address. :Now I know a Fluke Device which is rather expensive is able to do this, but :I would like to know if there is any other way. It's pretty much impossible to do reliably. :1. Not all devices have an IP address they are on DHCP, so a ping command :will not work. Once cable is removed no IP is assigned thus no Mac address. ARP tables time out after 3 minutes usually, so missing device while it is talking is a very real possibility if you try to proceed by way of SNMP probes of the routers and switches. :2. Its needs to be an inexpensive way to get the Mac address either using a :laptop with crossover or a PDA type device with the right adaptor :3.The recovery of the Mac address will be done by semi-skilled staff (uni :students with little or no technical skill), so it needs to be easy Ummm, I just realized that your wording leaves open the possibility that you are planning to have staff go around to each of the devices and use the gizmo to probe the MAC address. Is that correct? Or are you trying to do this in an automated way from a management program? If the idea is to go around to each device, then you have to be aware that there is no way to provoke a device that is certain to make it respond. Devices can do whatever they want when they receive packets, including ignoring the packets. The Fluke LanMeter and later decendants do not reliably discover MAC addresses: they more or less just wait for the host to say something. Any given PC or Unix machine might be firewalled to not respond to probes. Some systems will, though, ARP for their own IP address as they come up (or as the interface is brought up), so as to detect whether another machine is already using that IP address. You can thus usually get a machine to say -something- by rebooting it. -- Inevitably, someone will flame me about this .signature. | ||||||||||||||||||||||
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Posted by SnaZZZ on December 17, 2004, 11:47 am
Please log in for more thread options That is correct I will be getting people to walk the floors and visit the
device individually. Most of the devices in question are Multifunction devices , ie photocopier that is a fax and printer as well Need a Mac address so that a third party billing audit application database can be populated. Snmp will them be used once the connection has been made. Bi-directional information things like meter readings and consumable status etc. SnaZZZ > :I have a need to interrogate 24,000 networked devices in an organisation.
but
> :The only piece of info I require from the device is its Mac address. > :Now I know a Fluke Device which is rather expensive is able to do this, > :I would like to know if there is any other way.
address.
> > It's pretty much impossible to do reliably. > > > :1. Not all devices have an IP address they are on DHCP, so a ping command > :will not work. Once cable is removed no IP is assigned thus no Mac >
a
> ARP tables time out after 3 minutes usually, so missing device > while it is talking is a very real possibility if you try to > proceed by way of SNMP probes of the routers and switches. > > :2. Its needs to be an inexpensive way to get the Mac address either using > :laptop with crossover or a PDA type device with the right adaptor
> :3.The recovery of the Mac address will be done by semi-skilled staff (uni > :students with little or no technical skill), so it needs to be easy > > Ummm, I just realized that your wording leaves open the possibility > that you are planning to have staff go around to each of the > devices and use the gizmo to probe the MAC address. Is that > correct? Or are you trying to do this in an automated way from > a management program? > > If the idea is to go around to each device, then you have to be > aware that there is no way to provoke a device that is certain > to make it respond. Devices can do whatever they want when > they receive packets, including ignoring the packets. > > The Fluke LanMeter and later decendants do not reliably discover > MAC addresses: they more or less just wait for the host to say > something. > > Any given PC or Unix machine might be firewalled to not respond > to probes. Some systems will, though, ARP for their own IP > address as they come up (or as the interface is brought up), > so as to detect whether another machine is already using > that IP address. You can thus usually get a machine to say > -something- by rebooting it. > -- > Inevitably, someone will flame me about this .signature. | ||||||||||||||||||||||
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Posted by on December 17, 2004, 12:22 pm
Please log in for more thread options >That is correct I will be getting people to walk the floors and visit the
>device individually. >Most of the devices in question are Multifunction devices , ie photocopier >that is a fax and printer as well >Need a Mac address so that a third party billing audit application database >can be populated. >Snmp will them be used once the connection has been made. Bi-directional >information things like meter readings and consumable status etc. I'm not sure that's going to work like you think, but most MF devices will give you their MAC address on their test page printout. If the "third party billing audit application database" knows about MAC addresses, why can't it be the one to find them? | ||||||||||||||||||||||
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