Trusting Option 82 Information; Specifying The Maximum Number Of Dhcp Clients Per Interface - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
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Trusting Option 82 Information

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Specifying the Maximum Number of DHCP Clients Per Interface

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To override the default setting of the broadcast bit in DHCP request packets:
Specify that you want to configure override options.
1.
[edit forwarding-options dhcp-relay]
user@host# edit overrides
Specify that the DHCP relay agent uses the Layer 2 unicast transmission method.
2.
[edit forwarding-options dhcp-relay overrides]
user@host# set layer2-unicast-replies
Extended DHCP Relay Agent Overview
Overriding the Default DHCP Relay Configuration Settings on page 373
By default, the DHCP relay agent treats client packets with a giaddr of 0 (zero) and
option 82 information as if the packets originated at an untrusted source, and drops them
without further processing. You can override this behavior and specify that the DHCP
relay agent process DHCP client packets that have a giaddr of 0 (zero) and contain
option 82 information.
To configure DHCP relay agent to trust option 82 information:
Specify that you want to configure override options.
1.
[edit forwarding-options dhcp-relay]
user@host# edit overrides
Specify that the DHCP relay agent process DHCP client packets with a giaddr of 0
2.
and that contain option 82 information.
[edit forwarding-options dhcp-relay overrides]
user@host# set trust-option-82
Extended DHCP Relay Agent Overview
Overriding the Default DHCP Relay Configuration Settings on page 373
By default, there is no limit to the number of DHCP local server or DHCP relay clients
allowed on an interface. However, you can override the default setting and specify the
maximum number of clients allowed per interface, in the range 1 through 500,000. When
the number of clients on the interface reaches the specified limit, no additional DHCP
Discover PDUs or DHCPv6 Solicit PDUs are accepted. When the number of clients
subsequently drops below the limit, new clients are again accepted.
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