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analulu
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Registered: Sep 2001
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Country: israel
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Working on: csse,csse+,
Total Posts: 40
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 11-26-01 07:37 AM
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dmaftei
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M
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That's ARP's job. When a host A knows the IP address a.b.c.d of another host B, and needs to find out B's MAC address, A sends an ARP request saying "whoever has a.b.c.d, tell me your MAC address". Only B, who has a.b.c.d, will answer the request, sending its MAC to A.
Does this answer your question?
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11-26-01 02:08 PM
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The Reamer
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Certifications: MCP, MCSE, MCT, CCNA, CCDA, CCNP
Working on: CCDP, CCIE
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If you are referring to the IP to MAC address in multicast addressing, then you are concerned with the lower 23 bits of the ip address. There have been several posts that related to this. This link was in one of the previous posts.
http://www.catspace.com/multi.htm
IMHO, I actually thought the Osborne book did a better job of explaining this than the Ciscopress book I read first.
Anyway, HTH.
Reamer
__________________
It's okay to talk to yourself, and even answer back. But if you say "huh?" to your own conversation, then you've got real problems!
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11-26-01 08:41 PM
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