• Extended DHCP Relay Agent Overview
Automatically Logging Out DHCP Clients
You can configure the extended DHCP local server and extended DHCP relay to
automatically log out DHCP clients. Auto logout immediately releases an existing client
when DHCP receives a discover packet from a client whose identity matches an existing
client. DHCP then releases the existing client IP address without waiting for the normal
lease expiration.
NOTE: When the existing client is released, the new client undergoes the
normal authentication process. The new client might not receive the same
IP address as the original client.
To configure DHCP client auto logout:
1. Specify that you want to configure override options.
•
For DHCP local server:
[edit system services dhcp-local-server]
user@host# edit overrides
•
For DHCP relay agent:
[edit forwarding-options dhcp-relay]
user@host# edit overrides
2. Enable auto logout and specify the secondary identification method you want to use
when the primary identification method is unsuccessful.
•
For example, to configure DHCP local server to use the incoming interface method:
[edit system services dhcp-local-server overrides]
user@host# set client-discover-match incoming-interface
•
For example, to configure DHCP relay agent to use the option 60 and option 82
method:
[edit forwarding-options dhcp-relay overrides]
user@host# set client-discover-match option60-and-option82
NOTE: If you change the auto logout configuration, existing clients continue
to use the auto logout setting that was configured when they logged in. New
clients use the new setting.
Related
Documentation
DHCP Auto Logout Overview•
• How DHCP Relay Agent Uses Option 82 for Auto Logout
• Allowing Only One DHCP Client Per Interface
Copyright © 2017, Juniper Networks, Inc.380
ACX Series Universal Access Router Configuration Guide
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