Disabling Arp Table Population - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Disabling ARP Table Population

332
DHCP Duplicate Client Differentiation Using Client Subinterface Overview on page 362
Understanding DHCP Client Operation on page 359
Configuring Address-Assignment Pools on page 318
Grouping Interfaces with Common DHCP Configurations on page 326
Guidelines for Configuring Interface Ranges on page 327
Group-Specific DHCP Local Server Options on page 328
Overriding Default DHCP Local Server Configuration Settings on page 329
Automatically Logging Out DHCP Clients on page 335
Enabling Processing of Client Information Requests on page 336
Configuring a DHCP Client on page 360
By default, DHCP populates the ARP table with the MAC address of a client when the
client binding is established. However, you might choose to use the DHCP
statement to hide the subscriber MAC address information, as it appears in ARP table
entries.
When running in a trusted environment (that is, when not using the
DHCP populates the ARP table with unique MAC addresses contained within the DHCP
PDU for each DHCP client:
Table 37: ARP Table in Trusted Environment
IP Address
Client 1 IP Address
Client 2 IP Address
Client 3 IP Address
In distrusted environments, you can specify the
addresses of clients. When you specify the
automatically populate the ARP table with MAC address information from the DHCP
PDU for each client. Instead, the system performs an ARP to obtain the MAC address of
each client and obtains the MAC address of the immediately attached device (for example,
a DSLAM). DHCP populates the ARP table with the same interface MAC address (for
example, MAC X from a DSLAM interface) for each client:
Table 38: ARP Table in Distrusted Environment
IP Address
Client 1 IP Address
no-arp
MAC Address
MAC A
MAC B
MAC C
statement to hide the MAC
no-arp
statement, DHCP does not
no-arp
MAC Address
MAC X
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no-arp
statement),