Re: Request for assignment of DLT value for GSMTAP

[Guy Harris <guy () alum mit edu>]

On Jul 21, 2009, at 12:38 PM, Harald Welte wrote:

> I've already sent mail about this in November 2008

The mail I see from you from November 26, 2008 says:

> Hi!
>
> I'm part of a Free Software project working on GSM protocol analysis  
> based
> on the gnuradio and USRP software.
>
> We would like to register two new linktypes called
>
> LINKTYPE_GSM_UM
>
> and
>
> LINKTYPE_GSM_ABIS
>
> GSM has many different interfaces between different parts of the  
> system, i.e.
> Um between MS and BTS, Abis between BTS and BSC, A between BSC and  
> MSC, etc.
>
> Right now I'm working on the Um and Abis interfaces, so I'm requesting
> LINKTYPE values for both of those.

and your subsequent mail on the same day was

> On Wed, Nov 26, 2008 at 03:33:08PM +0530, Harald Welte wrote:
>
> > We would like to register two new linktypes called
> >
> > LINKTYPE_GSM_UM
> >
> > and
> >
> > LINKTYPE_GSM_ABIS
>
> please make that LINKTYPE_GSMTAP_UM and LINKTYPE_GSMTAP_ABIS in  
> order to
> indicate that all messages will be prefixed by a 'gsmtap' header,  
> before the actual payload in the Um / Abis format.

> by never got a response.

The response I sent on November 27, 2008 was:

> On Nov 26, 2008, at 8:51 PM, Harald Welte wrote:
>
> > please make that LINKTYPE_GSMTAP_UM and LINKTYPE_GSMTAP_ABIS in  
> > order to
> > indicate that all messages will be prefixed by a 'gsmtap' header,  
> > before the actual payload in the Um / Abis format.
>
> DLT_GSMTAP_UM/LINKTYPE_GSMTAP_UM: 217
>
> DLT_GSMTAP_ABIS/LINKTYPE_GSMTAP_ABIS: 218
>
> Note that it might be possible to modify libpcap to directly capture  
> from the devices, rather than going through a TUN interface as per
>
>         http://thre.at/gsm/

Are you subscribed to the tcpdump-workers list?  Mail sent to the list  
has a Reply-To: header causing replies to go only to the list, so if  
you're not subscribed, you won't see the replies.

I'm CCing you on this reply, under the assumption that you're not  
subscribed to the list.

> Can you please assign a DLT_ value for GSMTAP?

*A* DLT_ value, or one for Um and one for ABis?  As per the above, you  
already have one for Um and one for Abis.
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