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If some other machine wants to communicate with some second other |
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machine ... say secmachine.homenet.com it connects to the DNS server of |
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homenet.com. (This step won't be done if IP addresses are in use. |
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|
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The DNS server then sends the IP address to firstmachine.homenet.com or |
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firstmachine uses the known one. |
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|
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Next firstmachine will broadcast an "ARP whois ip.of.sec.srv" request. |
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sec.srv or secmachine will answer with an ARP reply which contains the |
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IP and the MAC address. |
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|
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Firstmachine then initiates the communication using this MAC address. |
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|
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Don't forget. The transport layer is ETHERNET. There don't exist IP |
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addresses. |
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|
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Just for clarification. |
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|
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arp will do exactly this and arpd can even collect such information |
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because every machine on a subnet will see all of the requests and |
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replies. |
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|
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Regards |
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Frank |
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|
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|
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On Wed, 2005-08-31 at 05:50 -0500, John Jolet wrote: |
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> On Aug 31, 2005, at 1:38 AM, Frank Schafer wrote: |
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> |
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> > |
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> > ... what about arp? |
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> > |
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> |
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> If this machine has the mac address listed on the outside of the |
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> case, or he opens it up to look at the card, sure. if you don't know |
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> what the mac address is....then you're stuck. Of course, if it's a |
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> small, home network, you could always just turn off all the other |
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> computers except that one and the one you're on and ask the router |
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> who's connected. be quicker just to launch nmap and go get some coffee. |
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-- |
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