| Author |
mac address on a remote computer?
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| HOOLIGAN 2001-11-19, 11:08 am |
| Is it possible to obtain the mac address of a remote host/router on another network ?
all i get with arp is local machines.
Cheers in advance.
Hooligan | |
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| No its not possible. The arp protocol works by way of broadcast. Thats why you can see the mac addresses for your local ethernet segments, but not across wan segemnts.
However, frame-relay has the ability to inverse-arp accross the link and dynamicly learn a neighbors DLCI number, therefore allowing you to forgoe configuring map statements for frame-relay neighbors.
hope this helps | |
| haseeb_eng 2001-11-19, 12:38 pm |
| well i think so you can do this through DHCP server & helper addresses . Just confirm with other members also . | |
| MadChef 2001-11-19, 3:53 pm |
| quote:
Originally posted by haseeb_eng
well i think so you can do this through DHCP server & helper addresses . Just confirm with other members also .
If you want to count encapusulating the DHCP packet (including the client hardware address in the DHCP header) in an IP packet and forwarding across the wan, then yes, you could determine the mac address of a remote machine. For that matter, you could determine the MAC of a remote machine if you put an IPX stack on it. View cam tables of remote switches, dlsw reachability with LLC2 on all your machines, snmp agents, NAM blades, etc.
But as far as just using IP tools, no, you can't do that.
MadChef | |
| strikeattack 2001-11-19, 8:11 pm |
| quote:
View cam tables of remote switches
This is only useful if you know the port that it is plugged into. Its more useful to telnet to the router that services that subnet and do a show arp. This will display the IP address and the MAC address. You may need to ping the node first to populate the ARP table with its MAC address. This is the best method, but of course it only works if you have access to the remote router. | |
| HOOLIGAN 2001-11-20, 4:08 am |
| cheers. That was a great help | |
| Yankee 2001-11-20, 4:33 am |
| Of course ya could always call the user on the other network and ask them 
Yankee | |
| MadChef 2001-11-20, 5:40 am |
| quote:
Originally posted by strikeattack
This is only useful if you know the port that it is plugged into.
Well yes. Those were not meant to be useful suggestions but rather a silly response to the previous post. (I suggest putting LLC2 everywhere and you fault me for doing a show cam? ) The point was that you can't determine this remotely with just IP. At some point you have to be on the local segment, like on the local router as you suggested.
MadChef | |
| strikeattack 2001-11-20, 8:57 am |
| quote:
I suggest putting LLC2 everywhere and you fault me for doing a show cam?
Ha! I was wondering about that one...
quote:
Of course ya could always call the user on the other network and ask them
Engineer: Yes, I am calling from your I/T, could you please give me your MAC address?
End User: I'm on a PC, not a Mac. You I/T guys think you know everything, but you don't even know what kind of computers we use.
Engineer: Your MAC address of your local machine, could you please give it to me?
End User: What?
End User: <Dead Air for several seconds>... Is that like a Big MAC?
Engineer: Um. No, actually. The MAC address is a layer-2, 48-bit address expressed in hexidecimal form that uniquely identifies your node among all others on your LAN.
End User: I have no idea what you just said. I hear the words, but they haven't any meaning.
Engineer: I can see this is going to take a while.
End User: Oh wait, I get it. "Mac Daddy." M-A-C D-A-D-D-Y is a perso...
Engineer: No.
End User: Macintosh?
Engineer: No.
End User: Chief Machine Accountant?
Engineer: No.
End User: Macaroni?
Engineer: Ugh.
End User: Manitoba Arts Council
Engineer: What?
End User: Manitoba Arts Council. The Manitoba Arts Council is an arm's-length agency of the Province of Manitoba, established to promote the study, enjoyment, production and performance of works in the arts.
Engineer: What in the hell are you talking about? LISTEN. M.... A.... C.... A-D-D-R-E-S-S.
End User: I'm getting tired of this.
Engineer: Me too. <CLICK>.
Knowing the user's IP address, the engineer then logs into the router that services that domain and does a SHOW ARP. | |
| HOOLIGAN 2001-11-20, 11:02 am |
| quote:
Of course ya could always call the user on the other network and ask them
my question was of a hypothetical nature, I am trying to get my head around the whole logical/physical addressing relationships.
I thought it would be interesting to investigage a route to see what make of equipment they use by their assigned mac address.( a little geeky i know ).
Cheers for all input | |
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| strikeattack <--- FUNNY
made my day with that dialogue :L)
good Luk to all on studies ! |
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