Yeah once in a while the list works the way it is supposed to.
As a sidelight, IPX does not have this problem, as the MAC address is a
component of the network address.
chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Dick
Silva
Sent: Monday, July 03, 2000 5:02 PM
To: Jamie Byrne; m. jean stockton; Cisco man; [EMAIL PROTECTED]
Subject: Re: ARP Broadcast
Another good, educational string
-----Original Message-----
From: Jamie Byrne <[EMAIL PROTECTED]>
To: m. jean stockton <[EMAIL PROTECTED]>; Cisco man
<[EMAIL PROTECTED]>; [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Monday, July 03, 2000 5:33 PM
Subject: RE: ARP Broadcast
>Communication across a LAN is layer-2 based. IP addresses are layer-3
>based. When a host has a given ip address, but not the associatied MAC
>address, communication across a LAN is not possible since the layer-3
>component is present, but not the layer-2 component. Thus the sending host
>has no "identifier" for the receiving host across the layer-2 media. This
>situation can only be resolved via a layer-2 broadcast, hence the broadcast
>nature of ARP.
>
>ARPs go out with a destination ip address, but a broadcast layer-2 address.
> Then the host with the corresponding ip address (if it exists and is
>responding) will answer the broadcast ARP with it's own MAC address, thus
>giving the sending host a valid layer-3 to layer-2 address mapping.
>
>Hope this helps.
>
>
>Jamie Byrne
>
>
>
>At 04:35 PM 7/3/00 -0400, m. jean stockton wrote:
>>Great Question!!! Seems that the only thing that is required is a
>>point-2-point communication as the IP address is known.
>>
>>My 2 cents worth.
>>
>>
>>makeeda
>>
>>-----Original Message-----
>>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>>Cisco man
>>Sent: Monday, July 03, 2000 1:22 AM
>>To: [EMAIL PROTECTED]
>>Subject: ARP Broadcast
>>
>>
>>Hi All,
>>
>>Could any one explain why ARP needs to broadcast when looking for the MAC
>>address. Why not send a unicast using the given IP address.
>>
>>Regards to all
>>
>>Vapian
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>>
>
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