The router using the IP helper address will change the mac address to it own
interface. Thus DHCP knows how to return back and in turn router send back
to the client at the correct interface


"Lists Wizard"  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hello group,
>
> I have a nagging question about how the DHCP server assigns an IP address
to
> a DHCP client from the correct pool of addresses. Let me give a scenario
so
> that you understand my concerns.
>
> A host called Subnet_A _Client sends a dhcp request. The router's
interface
> on subnet A is Ethernet_A. The router sends the dhcp request to subnet B,
> where the DHCP server resides. The router's interface on subnet B is
> Ethernet_B.
>
> My question is how will  the DHCP server know that the dhcp request is
> coming from subnet A?
> Will the DHCP server unicast or broadcast the dhcp reply? To which address
> will the server unicast its dhcp reply?
>
> If someone can help me or refer me to a good online document that will
> answer my questions, I will appreciate it.
>
>
> Thanks
>
> Lw
> FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]




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