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Creating User-Defined DHCP

You can configure one or more user-defined options that are not included in the JUNOS default implementation of the DHCP server. For example, if a client requests a DHCP option that is not included in the DHCP server, you can create a user-defined option that enables the server to respond to the client’s request.

To configure a user-defined DHCP option, include the option statement:



option {
[ (id-number option-type option-value) | (id-number array option-typeoption-value) ] ;
}

The option statement specifies the following values:

id-number—Any whole number. The ID number is used to index the option and must be unique across a DHCP server.

option-type—Any of the following types: flag, byte, string, short, unsigned-short, integer, unsigned-integer, ip-address.

array—An option can include an array of values.

option-value—Value associated with an option. The option value must be compatible with the option type (for example, an On or Off value for a flag type).

You can include this statement at the following hierarchy levels:



[edit system services dhcp]
[edit system services dhcp pool]
[edit system services dhcp static-binding]

The following example shows user-defined DHCP options:



[edit system services dhcp]
option 19 flag off;       # 19: "IP Forwarding" option
option 40 string "domain.tld"; # 40: "NIS Domain" option
option 16 ip-address 10.3.3.33; # 16: "Swap Server" option

User-defined options that conflict with DHCP configuration statements are ignored by the server. For example, in the following configuration, the DHCP server ignores the user-defined option 3 router statement and uses the edit system services dhcp router statement instead:



[edit system services dhcp]
option 3 router 10.7.7.2;      # 3: "Default Router" option
router {
10.7.7.1;
}

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