Subject: Question about Option 252 for Web Proxy Auto-Discovery

[Parkin, Richard (R.)]

Thanks for the responses; greatly appreciated!



--
Rich Parkin
Ford Motor Company
DDI Planner (DNS, DHCP, IPAM)
[Logo, company name  Description automatically generated]


Message: 2
Date: Fri, 10 Sep 2021 02:57:59 -0400
From: Bill Shirley <bill at c3po.polymerindustries.biz>
To: dhcp-users at lists.isc.org
Subject: Re: Question about Option 252 for Web Proxy Auto-Discovery
Message-ID:
        <a9de3a92-20e4-fbd6-d731-ff9e731d23ae at c3po.polymerindustries.biz>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

# local proxy autodiscovery
option local-pac-server??????????? code 252 = text;

subnet 192.168.1.0 netmask 255.255.255.0 {
 ? option local-pac-server "https://clicktime.symantec.com/3BjUDn6pGfTTKCY2EBDGYuo7Vc?u=http%3A%2F%2Fwww.example.com%2Fwpad.dat";
.
}

Bill

On 9/8/2021 12:30 PM, perl-list wrote:
> I have no specific knowledge of option 252, but, generally speaking in the dhcp config file when defining a string value, it is usually in quotes.  I would guess that to be the case with this as well.
>
> ----- Original Message -----
>> From: "Parkin, Richard (R.)" <rparki21 at ford.com>
>> To: "Users of ISC DHCP" <dhcp-users at lists.isc.org>
>> Sent: Wednesday, September 8, 2021 10:09:04 AM
>> Subject: Question about Option 252 for Web Proxy Auto-Discovery
>> Greetings!
>> I have a question about configuring Option 252 for Web Proxy Auto-Discovery.
>> Our IPAM allowed me to generate a configuration statement that resembles this:
>> option 252 https://clicktime.symantec.com/35QjqzExopR4wQxNEviwD8k7Vc?u=http%3A%2F%2Fexample.com%2Fwpad.dat;
>> What I am wondering is if the URL string needs to be quoted for this to work,
>> like so:
>> option 252 ?https://clicktime.symantec.com/3Qyf6x864yVqLFvbj9aYLDG7Vc?u=http%3A%2F%2Fexample.com%2Fwpad.dat%3F;
>> I haven?t been able to find a definitive answer. Is it safer to assume the
>> quotes are needed?
>> Thanks!
>> --
>> Rich Parkin
>> Ford Motor Company
>> DDI Planner (DNS, DHCP, IPAM)
>> _______________________________________________


Message: 3
Date: Fri, 10 Sep 2021 19:20:41 +1000
From: Glenn Satchell <glenn.satchell at uniq.com.au>
To: Users of ISC DHCP <dhcp-users at lists.isc.org>
Subject: Re: Question about Option 252 for Web Proxy Auto-Discovery
Message-ID: <c87b19a2b51a1e465cb86004cb77f68f at uniq.com.au>
Content-Type: text/plain; charset=US-ASCII; format=flowed

Hi Richard,

The definitive answer is in the dhcp-options man page:

     REFERENCE: OPTION STATEMENTS

         The text data type specifies an NVT ASCII string, which must be
enclosed in double quotes - for example, to specify a root-path option,
the syntax would be
         option root-path "10.0.1.4:/var/tmp/rootfs";

and further down that same document

        TEXT

        option new-name code new-code = text ;

        An option whose type is text will encode an ASCII text string.
For example:

        option sql-default-connection-name code 194 = text;
        option sql-default-connection-name "PRODZA";

regards,
Glenn

On 2021-09-10 16:57, Bill Shirley wrote:

> # local proxy autodiscovery
> option local-pac-server            code 252 = text;
>
> subnet 192.168.1.0 netmask 255.255.255.0 {
> option local-pac-server         "https://clicktime.symantec.com/3BjUDn6pGfTTKCY2EBDGYuo7Vc?u=http%3A%2F%2Fwww.example.com%2Fwpad.dat";
> .
> }
>
> Bill
>
> On 9/8/2021 12:30 PM, perl-list wrote:
>
> I have no specific knowledge of option 252, but, generally speaking in
> the dhcp config file when defining a string value, it is usually in
> quotes.  I would guess that to be the case with this as well.
>
> ----- Original Message -----
>
> From: "Parkin, Richard (R.)" <rparki21 at ford.com>
> To: "Users of ISC DHCP" <dhcp-users at lists.isc.org>
> Sent: Wednesday, September 8, 2021 10:09:04 AM
> Subject: Question about Option 252 for Web Proxy Auto-Discovery
>
> Greetings!
>
> I have a question about configuring Option 252 for Web Proxy
> Auto-Discovery.
>
> Our IPAM allowed me to generate a configuration statement that
> resembles this:
>
> option 252 https://clicktime.symantec.com/35QjqzExopR4wQxNEviwD8k7Vc?u=http%3A%2F%2Fexample.com%2Fwpad.dat;
>
> What I am wondering is if the URL string needs to be quoted for this to
> work,
> like so:
>
> option 252 "https://clicktime.symantec.com/35QjqzExopR4wQxNEviwD8k7Vc?u=http%3A%2F%2Fexample.com%2Fwpad.dat";
>
> I haven't been able to find a definitive answer. Is it safer to assume
> the
> quotes are needed?
>
> Thanks!
>
> --
>
> Rich Parkin
>
> Ford Motor Company
>
> DDI Planner (DNS, DHCP, IPAM)
>
> _______________________________________________

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