Re: [vserver] ping vs. IP address vs. MAC (address)

From: Martin <inkubus_at_interalpha.co.uk>
Date: Fri 01 May 2009 - 17:03:47 BST
Message-Id: <1241193827.4909.198.camel@white.sevalidation.com>

On Fri, 2009-05-01 at 08:54 -0700, Roderick A. Anderson wrote:
> I'm asking for a clue stick here. First time I've run into this issue
> ... hard. Be a few times where it took a bit for outbound traffic to
> get a route but can't remember running into this problem.
>
> The short question is: does the network/NIC _know_ which IP address it
> is responding for when a ping request comes in or does it just respond
> to the ping request at the MAC (hardware?) level?
>

Ping uses ICMP, which is a service running over IP, thus it is processed
with the rest of the IP layer (in the kernel, unless you ahve a very
expensive TCP/IP offload engine). This is layer 3, MAC is a link level
(level 2) concept and thus independant of the processing of ICMP, beyond
providing a packet connection.

Cheers,
 - Martin
Received on Fri May 1 17:04:02 2009

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