From: Ivan (ivan@iip.net)
Date: Fri Feb 09 2007 - 09:11:04 ART
Exactly. Client request src mac is "me".
What concern other host that receive DHCP discovery message, they all can
responce with DHCP offer. But this can appear in two cases
*) there real DHCP-server
*) there fake DHCP-server
You can see more detail description of this process here
http://cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a00800f0804.shtml
On Friday 09 February 2007 13:23, Stefan Grey wrote:
> Well it would be great if you could also provide me with details on this.
>
> It seems me quite illogical what you have written here. Why the client sets
> the source mac to 0?? It really does know it's own address.
>
> >Server Responce (suppose they directly connected):
> >SRC MAC: me
> >DST MAC: FFFFFFFF
> >SRC IP: me
> >DST IP: local broadcast
>
> If the server responds in this way than any host would receive this packet
> and think that it is for them..... Another thing which I am not sure here
> is that I have heared that in DHCP offer message the DHCP server sets the
> IP address of destination the same IP address which it wants to assign to
> the client.
>
> Any thoughts??
>
> >From: Ivan <ivan@iip.net>
> >To: "Stefan Grey" <examplebrain@hotmail.com>
> >Subject: Re: DHCP question
> >Date: Fri, 9 Feb 2007 12:57:24 +0300
> >
> >As you wrote you didn't want detail. I try explain as briefly as i can.
> >
> >Client Request
> >SRC MAC: 0:0:0
> >DST MAC: FFFFFFFF
> >SRC IP: 0
> >DST IP: General broadcast
> >
> >Server Responce (suppose they directly connected):
> >SRC MAC: me
> >DST MAC: FFFFFFFF
> >SRC IP: me
> >DST IP: local broadcast
> >
> >On Friday 09 February 2007 12:23, Stefan Grey wrote:
> > > Hello guys,
> > >
> > > Could you please explain me the following?? Which addresses (MAC and
> > > IP)
> >
> >do
> >
> > > the host and the DHCP server use in the process of communication.
> > > Could you please confirm and expain the following thigs??
> > > Do I correctly understand that the hosts sends the DHCP request with
> > > destination FF:FF:FF:FF MAC and destination IP 255.255.255.255 to the
> >
> >local
> >
> > > network?? It uses its MAC as the source... which IP address does it use
> >
> >as
> >
> > > the source?? And then the DHCP address answers in unicast as I remember
> > > with its IP and MAC as the source and the MAC of the hosts as the MAC
> > > destination... which IP it uses as the destination IP address??
> > >
> > > The question appeared because I can't understand how two layer 7
> > > devices can communicate without know the IP address exactly. How do
> > > they
> >
> >overcome
> >
> > > here this problem. I did a short research on this but the documents
> >
> >didn't
> >
> > > give me the details.
> > > Thank you very much.
> > > Please help...
> > >
> > > Regards,
> > >
> > > Stefan.
> > >
> > > _________________________________________________________________
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> >--
> >Ivan
>
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-- Ivan
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