Question

how does the server know to assign ip info from the 20% scope and not the 80% scope?

Asked by: jwf1776

This dhcp question isn’t about an actual problem but a dhcp concept I can’t figure out.

When a dhcp server has 2 scope with different subnets, how does it know which scope to assign addresses from?

For example, if a network has 2 segments with 1 dhcp server per segment.  And each dhcp server is using the 80/20 rule where it has 20% of the addresses from the other segment.  If the primary (80%) dhcp server fails to service a dhcp request/broadcast and the secondary server (20%) receives it, how does the server know to assign the request/broadcast ip info from the 20% scope and not the 80% scope?

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Asked On
2005-08-18 at 08:57:15ID21531772
Tags

dhcp

,

does

,

how

,

know

,

scope

Topic

Windows Networking

Participating Experts
1
Points
500
Comments
1

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Answers

 

by: Debsyl99Posted on 2005-08-18 at 10:08:00ID: 14702366

Hi
Check out:
DHCP: Spanning Multiple Subnets
"A relay agent that conforms to RFC 1542 relays DHCP packets to the remote side even though they are broadcast packets. Before relaying a DHCP message from a DHCP client, the agent examines the GIADDR (gateway IP address) field. If the field has an IP address of 0.0.0.0, the agent fills it with the router's IP address. When the DHCP server receives the message, it examines the Relay IP Address field to see if it has a DHCP scope (a pool of IP addresses) that can be
used to supply an IP address lease. If the DHCP server has multiple DHCP scopes, the address in the Relay IP Address field identifies the DHCP scope from which to offer an IP address lease. This process allows one DHCP server to manage
different scopes for subnets. "
From:
DHCP: SPanning Multiple Subnets
http://support.microsoft.com/?kbid=120932

Deb :))

20120131-EE-VQP-002

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