First a computer does looks in it's arp (Address resolution protocol) cache
to see if it already has an IP to MAC in it's database. If it does not the
computer generally will do an ARP broadcast which all systems see and the
computer using that ip address will respond with it's MAC address the Mac is
stored in the cache and the frame is sent to that computer. If the IP
address is not local, and the router see's the arp and has a destination to
that IP or IP network it will respond with it's own mac and the frame will
be delivered to the router who will then route it to the appropraite
network/system.
The first 6 are the manufacturer code.
-----Original Message-----
From: Oscar Rau [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 08, 2000 6:46 PM
To: Cisco GroupStudy
Subject: MAC address
While an IP packet is being packaged to be delivered at the Ethernet frame
stage,
how is the destination MAC address determined? Is the destination MAC
address going
to be MAC address of the local gateway or the remote host?
Is the MAC changed by the network devices (routers) along the way until it
has been delivered to
the destination Ethernet IP address?
If a MAC address is,
01 23 45 67 89 11
Which half is the vendor specific portion? Where would the multicast bit and
locally
administered MAC address bit be located?
Thank you in advance.
--
Oscar Rau
[EMAIL PROTECTED]
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