Wireshark · Ethereal-dev: Re: [Ethereal-dev] patch Frame Relay dissector to dissect GPRS Network Service protocol

[Guy Harris <guy@xxxxxxxxxxxx>]

On Wednesday, September 3, 2003, at 12:39 AM, Guy Harris wrote:

> > The structure of FR-NS packet
> > is : 2bytes FR header, 1 byte information element
> > code , 0 or more bytes ,it depends on type of
> > information element, payload or next layer
> > protocol (BSSGP). The Frame Relay with Network
> > service make one network protocol layer.
>
> Really?  It's not two network layers?  It really sounds like two 
> network
> layers to me.  Section 9 of 08.16 seems to be describing the network
> service PDUs as starting with the PDU type, not with the frame relay
> header....

I've checked in a version of your GPRS NS code as a separate dissector 
(packet-gprs-ns.c), along with a preference item in the Frame Relay 
dissector to select whether to assume FRF 3.2/Cisco HDLC (depending on 
what the packet looks like) or GPRS Network Service as the payload.