configuring dhcp server

i want to configure my dhcpd server on my linux machine with option 82. The relay agent is a cisco switch 2950 with dhcp snooping enabled with option 82 . I want to map the host to the port given by relay agent with option 82. I configured my server only to log changes, but i dont know the configuration for mapping the host to port:
in dhcpd.conf
if exists agent.circuit-id
{
        log ( info, concat( "Lease for ", binary-to-ascii (10, 8, ".", leased-address), " is connected to interface ",
        binary-to-ascii (10, 8, "/", suffix ( option agent.circuit-id, 2)), " (add 1 to port number!), VLAN ",
        binary-to-ascii (10, 16, "", substring( option agent.circuit-id, 2, 2)),  " on switch ",
        binary-to-ascii(16, 8, ":", substring( option agent.remote-id, 2, 6))));

        log ( info, concat( "Lease for ", binary-to-ascii (10, 8, ".", leased-address),
        " raw option-82 info is CID: ", binary-to-ascii (10, 8, ".", option agent.circuit-id), " AID: ",
        binary-to-ascii(16, 8, ".", option agent.remote-id)));

}


tnx
cami_rusAsked:
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gheistCommented:
Should be similar to this:

DHCP based autodiscovery

    If you are running a DHCP server on your network anyway, you might want to use this approach; all you have to do is to add the WPAD option (numeric 252 or hex fc) as a string containing the URL to the PAC script.

    To do so with older versions of ISC dhcpd, add this to /etc/dhcpd.conf, either globally or just for the subnets you want to enable WPAD for:

    option option-252 "http://example.com/path/to/proxyconfig.pac";

    Or, for newer ISC dhcpd versions, add this globally:

    option wpad code 252 = text;

    and this either globally or for the WPAD subnets:

    option wpad "http://example.com/path/to/proxyconfig.pac";

    For other DHCP servers, please consult the reference manual on how to add an option by number if WPAD support is not built-in.

stolen at: http://l10n.kde.org/docs/admin/konqueror.html

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