Creating expressions to set hostname of client

[Simon Hobson]

Aaron Randall wrote:

>In the manual pages is says that the syntax is
>"option host-name = expression", and an example is "option host-name =
>binary-to-ascii(16,8,"-",substring(hardware,1,6));".  Can anyone explain
>how this expression is constructed?

Try 'man dhcp-eval' for starters.

Also, there's been many examples on this list, such as this one from 
Ray Phillips on 2nd June (thread: assigning client-hostname) :


>I've been able to assign a ddns-hostname to clients which don't
>provide one using
>
>option server.ddns-hostname = pick-first-value (
>    option fqdn.hostname,
>    option host-name,
>    concat (
>      "mac-",
>      suffix (concat ("0", binary-to-ascii (16, 8, "",
>        substring (hardware, 4, 1))),2), "-",
>      suffix (concat ("0", binary-to-ascii (16, 8, "",
>        substring (hardware, 5, 1))),2), "-",
>      suffix (concat ("0", binary-to-ascii (16, 8, "",
>        substring (hardware, 6, 1))),2)
>    )
>);