Microsoft Disable Netbios Option

[Meike Stone]

Hello Charles,

Am Mi., 10. Okt. 2018 um 17:27 Uhr schrieb Anderson, Charles R <cra at wpi.edu>:
>
> You need to set the vendor-option-space.  You see, option 43 is "shared" among many different vendors and each vendor can have a different format for sub-options inside option 43.
>
> For example, to set up the option space for APC vendor option codes, use this:
>
> class "APC" {
>   match if option vendor-class-identifier = "APC";
>   option APC.cookie "1APC";
>   option server.vendor-option-space APC;
> }
>
> and for Microsoft, this should work:
>
> option space MSFT;
> option MSFT.disable-netbios code 1 = unsigned integer 8;
> option MSFT.release-on-shutdown code 2 = unsigned integer 32;
> option MSFT.default-router-ttl code 3 = unsigned integer 32;
>
> class "Microsoft Windows" {
>   match if option vendor-class-identifier = "MSFT";
>   option server.vendor-option-space MSFT;
> }
> class "Microsoft Windows 2000" {
>   match if option vendor-class-identifier = "MSFT 5.0";
>   option server.vendor-option-space MSFT;
> }
> class "Microsoft Windows 98/Me" {
>   match if option vendor-class-identifier = "MSFT 98";
> }

option server.vendor-option-space MSFT;

That was the missing link ... I've looked (man dhcp* ) for such kind
of option, but noting found.
*Where is this "option" documented?*

I tried too:

option space MSFT;
option MSFT.disable-netbios code 1 = unsigned integer 8;

class "Microsoft Windows" {
    match if option vendor-class-identifier = "MSFT";
    MSFT.disable-netbios 2;
 }

Many thanks, now it works :-D

Meike

>
>
> On Wed, Oct 10, 2018 at 04:09:00PM +0200, Meike Stone wrote:
> > Hello dear list,
> >
> > I try to configure "Microsoft Disable Netbios Option".
> > If I use:
> > option space MSFT;
> > option MSFT.nbt  code 1 = unsigned integer 32;
> > option MSFT.nbt 2;
> >
> > nothing happens. The client has a acitvated the parameter "Netbios
> > over TCP/IP" (seen with ipconfig) after getting the IP via DHCP. But
> > the client sends in the discover in the "parameter request list"
> > (option 55) the options 43, but the server doesn't sends the option 43
> > back. (sniffed with wireshark)
> >
> > If I remove the config from above and configure:
> >
> > option vendor-encapsulated-options 01:04:00:00:00:02;
> >
> > the client get's the option 43 from the server and the parameter
> > "Netbios over TCP/IP" (seen with ipconfig) is disabled as expected.
> >
> > Why is one configration working and the other not?
> >
> > (all configurations are done in the global section, I use ISC server
> > version 4.3.3 on SLES12SP3)