[c-nsp] Understanding how ARP works

[Whisper]

Also, Switches know nothing of IP addresses either.

On Sun, Jun 8, 2008 at 1:27 AM, Daniel Dib <daniel.dib at reaper.nu> wrote:

> *On SwitchA:*
>
>
> SwitchA receives the request (arp who has) for the IP address of Host B and
> it checks its MAC table but none found so it will broadcast the request to
> all ports and changes the Src MAC to that of the switch port that is
> directly connected to e0 on the router.
>
> Switches don't modify frames, they just forward them. So the switch will
> not
> modify the src MAC. The frame will be a broadcast as Gert said
> FF-FF-FF-FF-FF-FF. The router responds with it's MAC and the switch learns
> what port this MAC sourced from. Or did I misinterpret your text?
>
> /Daniel
>
>
>
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