(no subject)
Chuck Anderson
cra at WPI.EDU
Wed Jun 13 00:58:58 UTC 2007
On Tue, Jun 12, 2007 at 04:46:26PM -0700, Jose Amengual wrote:
> I have this configuration in my dhcp server, and i try to give to an
> Ip phone with the string "MTA3308" one of the ip address pool bellow,
> but is not working.
> class "pepe" {
> match if substring (option vendor-class-identifier, 0, 4) = "MTA3308";
> }
> In this part "(option vendor-class-identifier, 0, 4)" where i can
> find this two numbers (in red ) ?( tcpdump, manufacture manual ).
This is documented in the dhcp-eval(5) manual page:
substring (data-expr, offset, length)
The substring operator evaluates the data expression and
returns the substring of the result of that evaluation that
starts offset bytes from the beginning, continuing for
length bytes. Offset and length are both numeric
expressions. If data-expr, offset or length evaluate to
null, then the result is also null. If offset is greater
than or equal to the length of the evaluated data, then a
zero-length data string is returned. If length is greater
then the remaining length of the evaluated data after
offset, then a data string containing all data from offset
to the end of the evaluated data is returned.
Since you have a 7-character string to match, this should work:
class "pepe" {
match if substring (option vendor-class-identifier, 0, 7) = "MTA3308";
}
> Can I use part of the mac address to give a range of ip address ?
> ( like give from 192.168.1.10 to 20 to all mac address starting with
> 00:15:00 ?)
You might be able to match on hardware address (the 'hardware' data
expression includes the one byte hardware type field, htype. 1 is
Ethernet).
class "hardware-vendor-x" {
match if substring (hardware, 0, 4) = 1:00:15:00;
}
'hardware' is also documented in dhcp-eval(5).
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