Allied Telesis x900-48 series User Manual
Alliedware, Os how to, Introduction
C613-16082-00 REV B
www.alliedtelesis.com
AlliedWare
TM
OS
How To |
Introduction
It has increasingly become a legal requirement for service providers to identify which of their
customers were using a specific IP address at a specific time. This means that service
providers must be able to:
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Know which customer was allocated an IP address at any time.
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Guarantee that customers cannot avoid detection by spoofing an IP address that was not
actually allocated to them.
These security features provide a traceable history in the event of an official query. Three
components are used to provide this traceable history:
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DHCP snooping
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DHCP Option 82
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DHCP filtering
What information will you find in this document?
This document describes DHCP snooping, DHCP Option 82 and DHCP filtering, and takes
you through step-by-step configuration examples.
With DHCP snooping, an administrator can control port-to-IP connectivity by:
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permitting port access to specified IP addresses only
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permitting port access to DHCP issued IP addresses only
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dictating the number of IP clients on any given port
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passing location information about an IP client to the DHCP server
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permitting only known IP clients to ARP
Use DHCP Snooping, Option 82, and Filtering on
AT-9900 and x900-48 Series Switches