Assign subnets to multiple classes with substring match expressions
Michele Vetturi
mvetturi at yahoo.it
Tue May 8 10:38:52 UTC 2007
Good day all.
I am a newbie of advanced DHCP configuration. So don't chastise me, please... :D
I want to match clients using a standardization of the
dhcp-client-identifier and classes.
Ex: "Internal;Prod_;BuildA;"
"Internal;QAEnv;BuildB;"
So, I wish to distinguish internal systems assigning them to a class "Internal"
class "Internal" {
match if (
( substring ( option dhcp-client-identifier, 0, 9) = "Internal;" )
);
option ip-forwarding off;
}
Notebooks of customers will be so assigned to a different pool
associated with a Guest VLAN.
My idea, then, was categorize Internal machines differentiating them
by the second field of the option dhcp-client-identifier, so...
class "Production" {
match if (
( substring ( option dhcp-client-identifier, 0, 9) = "Internal;" ) and
( substring ( option dhcp-client-identifier, 10, 6) = "Prod_;" )
);
}
class "QA-Environment" {
match if (
( substring ( option dhcp-client-identifier, 0, 9) = "Internal;" ) and
( substring ( option dhcp-client-identifier, 10, 6) = "QAEnv;" )
);
}
May this work, in your opinion? Will the system be part of both
classes? Could I write the following instead (or something similar)?
class "QA-Environment" {
match if (
( member of = "Internal;" ) and
( substring ( option dhcp-client-identifier, 10, 6) = "QAEnv;" )
);
}
Last stupid question (sorry :) ... Is the syntax of my second
substring expression correct? What does the last parameter mean - the
length of the resulting string or the last char to include?
Thank you very much for your response and sorry for my broken english.
Great list!
--
Michele Vetturi
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