Specifications

DHCP Generic Options

You can specify DHCP Generic Options which allow you to conﬁgure the content to be

served for particular option numbers.

set dhcp gen-option name

name

Speciﬁes a DHCP generic option set named name of one to 15 characters. You can specify

up to 20 gen-options. Each can contain up to 100 bytes of data, up to a maximum of 912

bytes of options data total. An option will be served only if the client requests it.

set dhcp gen-option option [ 1 – 255 ]

Speciﬁes the DHCP option by number, 1 – 255. The following table shows the formats and

sizes for known options, and whether or not you can conﬁgure a gen-option of that type.

Option Data Format

Data Size

(bytes)

Can

Conﬁgure

0 Empty 0 No

1 IP mask 4 Yes

2 Unsigned 4 byte integer 4 Yes

3 - 11 IP address list Multiples of 4 Yes

12 String (up to 100 characters) N Yes

13 Unsigned 2 byte integer 2 Yes

14 - 15 String (up to 100 characters) N Yes

16 Unsigned 4 byte integer 4 Yes

17 String (up to 100 characters) N Yes

18 String (up to 100 characters) N Yes

19 - 20 Flag 1 Yes

21 IP address & mask list Multiples of 8 Yes

22 Unsigned 2 byte integer 2 Yes

23 Unsigned 1 byte integer 1 Yes

24 Unsigned 4 byte integer 4 Yes

25 Unsigned 2 byte integer list Multiples of 2 Yes

26 Unsigned 2 byte integer 2 Yes

27 Flag 1 Yes