My 2c on this .
When the DHCP broadcasts crosses the router ,it carries that routers mask
and ip info across to the dhcp server ( assuming helpder is there)
the DHCP server on seeing that the reqest came from that particular subnet
issues an ip from a scope ...U could configure multiple scopes and combine
them into one superscope to do this. Hope this helps.
Cheers,Padhu
-----Original Message-----
From: whatshakin
To: [EMAIL PROTECTED]
Sent: 7/16/00 12:11 PM
Subject: DHCP and subnets
Hello folks,
Please clarify this for me.
Hypothetical example: Campus LAN with multiple buildings. Each building
on its own vlan and with its own subnet addressing scheme. All buildings
tied in to a Catalyst 5500 which has RSP doing all the inter-vlan
routing. Data center using a single DHCP server with multiple scopes
(one scope per vlan/subnet etc) to supply all vlans/subnets with their
respective ip addresses. I want to understand how the DHCP server knows
how to hand out the correct ip address from the corresponding subnet to
the workstations that request them. I have come to believe that
initially DHCP servers have no idea whom is requesting an address, they
just hand them out to whoever asks...this is what is confusing. I
understand that each Vlan needs its own gateway address where the
workstations aim their broadcasts and there an ip helper-address
statement in the RSP for each vlan, but I still don't understand how the
DHCP server knows how to hand out the appropriate address when it has
multiple scopes enabled.
TIA for any clarification you can offer.
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