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Home Documentation Junos OS Junos CLI Reference CLI Reference H

Junos CLI Reference

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Junos CLI Reference
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{ "lLangCode": "en", "lName": "English", "lCountryCode": "us", "transcode": "en_US" }
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helpers

date_range 19-Nov-23
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Syntax

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helpers {
    bootp {
        client-response-ttl number;
        description text-description;
        interface interface-group {
            client-response-ttl number;
            description text-description;
            maximum-hop-count number;
            minimum-wait-time seconds;
            no-listen;
            server address {
                logical-system logical-system-name <routing-instance [ <default> routing-instance-names ]>;
                routing-instance [ <default> routing-instance-names ];
            }
        }
        maximum-hop-count number;
        minimum-wait-time seconds;
        relay-agent-option;
        server address {
            logical-system logical-system-name <routing-instance [ <default> routing-instance-names ]>;
            routing-instance [ <default> routing-instance-names ];
        }
    }
    domain {
        description text-description;
        interface interface-name {
            broadcast;
            description text-description;
            no-listen;
            server address <logical-system logical-system-name> <routing-instance routing-instance-name>;
        }
        server address <logical-system logical-system-name> <routing-instance routing-instance-name>;
    }
    port (Packet Forwarding) port-number {
        description text-description;
        interface interface-name {
            broadcast;
            description text-description;
            no-listen;
            server address <logical-system logical-system-name> <routing-instance routing-instance-name>;
        }
        server address <logical-system logical-system-name> <routing-instance routing-instance-name>;
    }
    tftp {
        description text-description;
        interface interface-name {
            broadcast;
            description text-description;
            no-listen;
            server address <logical-system logical-system-name> <routing-instance routing-instance-name>;
        }
        server address <logical-system logical-system-name> <routing-instance routing-instance-name>;
    }
    traceoptions {
        file filename  <files number> <match regular-expression> <size bytes> <world-readable | no-world-readable>;
        flag flag;
        level level;
        no-remote-trace level;
    }
}

Hierarchy Level

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[edit forwarding-options]

Description

Enable TFTP or DNS request packet forwarding, or configure the router, switch, or interface to act as a DHCP/BOOTP relay agent. Use only one server address per interface or global configuration.

You can also use the helpers port statement to enable forwarding LAN broadcast traffic on custom UDP ports to particular servers as unicast traffic. Configure the UDP port number and optionally an interface on which to listen for broadcast traffic, and the destination server address to receive that traffic, as shown in either of the following sample configurations:

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user@ host# show forwarding-options
helpers {
    port 1200 {
        server 10.20.30.40;
        }
    }
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user@ host# show forwarding-options
helpers {
    port 3000 {
        interface {
            fe-0/0/1.0 {
                server 192.0.2.2;
            }
        }
    }
    port 3001 {
        interface {
            fe-0/0/0.0 {
                server 192.0.2.2;
            }
        }
    }
}

The remaining statements are explained separately. See CLI Explorer.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced before Junos OS Release 7.4.

Related Documentation

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