From: Maxim Kurushkin (m.kurushkin@orange-ftgroup.ru)
Date: Fri Feb 09 2007 - 08:42:56 ART
Hi, Stefan.
Use Cisco and yuor braine. :-)
There are many very good documents on Cisco site.
I think that you are looking something like this:
"Understanding and Troubleshooting DHCP in Catalyst Switch or Enterprise
Networks"
http://cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a00800f0804.shtml
WBR,
Maxim
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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