Re: Linktype needed

["Martin Angler" <martin.angler () email it>]

Hello,

 

Yes, our driver will supply "raw" packets with the header specified by the
BACnet specification. Therefore we would appreciate your first suggestion,
which would be naming the linktype DLT_BACNET_MS_TP.

 

Thanks in advance,

Martin Angler

 

-----Ursprüngliche Nachricht-----

Von: tcpdump-workers-owner () lists tcpdump org [
<mailto:tcpdump-workers-owner () lists tcpdump org>
mailto:tcpdump-workers-owner () lists tcpdump org] Im Auftrag von Guy Harris

Gesendet: Samstag, 5. Juni 2004 20:56

An: tcpdump-workers () lists tcpdump org

Betreff: Re: [tcpdump-workers] Linktype needed

 

Martin Angler said:

> my name is Martin Angler and I am developing a BACnet MS/TP - enabled

netdevice-driver

> under GNU/Debian Linux. Now I've seen, that there is no linktype that

specifies BACnet

> MS/TP. So I wanted to ask whether you could define/implement a

corresponding linktype.

 

I infer from some stuff I've seen that BACnet MS/TP is a link-layer protocol
atop which the higher-level BACnet protocols can run (just as they can run
atop UDP and 802.2).

 

Will your driver supply "raw" packets with a header specified by the BACnet
specification (the ISO standard appears to cost over 350 CHF, so I haven't
bought it), or will it supply some form of "cooked" software that might not
be what other BACnet MS/TP capture mechanisms might supply?  If the former,
the linktype should probably be called DLT_BACNET_MS_TP or something such as
that; if the latter, the name should probably have something in it to
indicate what type of header it is (see, for example, DLT_ARCNET, which
should perhaps have been DLT_ARCNET_BSD, and DLT_ARCNET_LINUX, or
DLT_APPLE_IP_OVER_IEEE1394, which is not raw Firewire but has a synthetic
header).

 

> Other people that worked on an MS/TP dissector (www.abmlinux.de) 

> already

tried to

> contact you, but without success.

 

I don't think I've seen that on tcpdump-workers.  Do they have their own
driver and, if so, does it supply the same link-layer header (if not, it'd
need a separate DLT_ value)?

 

 

 

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