[lwip-users] Re: [lwip] IP forming an Ethernet frame.

[Pablo Bleyer Kocik]

  If I understood your question correctly... Ethernet is to Ethernet what 
IP is to IP. IP lives in the network layer (main concern is routing stuff 
at the global scale) while Ethernet is at the data link (how do I send 
stuff reliably from this computer to the next one). Strictly, an Ethernet 
packet wraps an IP message completely. You could deliver an IP datagram 
from one computer to another typing in one while reading the bytes from the 
screen of the other (you would be the data link, then).

  However, in an Ethernet network commonly an association exists between 
Ethernet addresses and IP addresses, and that's why the *ARP* protocols 
exist. But then again, this is only meaningful at the link layer.

  Cheers.

At 04:04 PM 18-06-2002 -0400, you wrote:

>Hi All,
>
>I wanted to onw thing. Which layer forms the ethernet frame. Is it the
>functionality of IP layer or the IP layer just passes an IP datagram to
>the layer 2 which wraps that datagram in an ethernet frame. Please guide
>me, I need this info badly.
>
>Amit
>
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--
PabloBleyerKocik / "Personally I don`t understand the motivation
  pbleyer        / to build robots in human form since humans are
   @embedded.cl / so available and inexpensive." -- Lou Boyd

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