netdev - Re: Question on DHCP

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Message-ID: <20101012184543.55ebf503@nehalam>
Date:	Tue, 12 Oct 2010 18:45:43 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Sri Ram Vemulpali <sri.ram.gmu06@...il.com>
Cc:	linux-netdev <netdev@...r.kernel.org>
Subject: Re: Question on DHCP

On Tue, 12 Oct 2010 21:33:25 -0400
Sri Ram Vemulpali <sri.ram.gmu06@...il.com> wrote:

> Hi All,
> 
>    I have very basic stupid doubt. Can anyone help to resolve this.
> 
> DHCP, is used for dynamically configuring IP address, mask, MTU, DNS
> domain, .... for a host. DHCP is a application layer protocol, but the
> values it configures are related to IP layer. How come DHCP can
> configure when its data packet in embedded in to IP datagram, which
> are disparate layers. I am little confused. Please clarify. Thanks.
> 

DHCP client uses UDP to send broadcast packet and find the nearest
server.  The Linux DHCP client ends up using a AF_PACKET socket because
it wants to seem MAC address of server.

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