Wireshark · Ethereal-dev: RE: [Ethereal-dev] RSVP-TE decode problem

[Ashok Narayanan <ashokn@xxxxxxxxx>]

Thanks for the capture. I have checked in the fix into the Ethereal CVS
to decode the Label Request correctly. I'll look into some sort of
stateful label type detection for flows soon.

-Ashok

On Fri, 2002-10-18 at 02:38, Szabó Gábor ICN E E/S wrote:
> Hi,
> 
> Please find attached capture file which is in Network Associates Sniffer
> format. It is a small, filtered capture with 3 frames. Frame 1 (the PATH
> message) contains the LABEL_REQUEST object.
> 
> Frame 2 (RESV) includes the LABEL object which is the logical response to
> the LABEL REQUEST. Unfortunately the RFC 3209 has a single C-type for this
> object, so I have to compute myself the ATM VPI/VCI parameters from the
> label value (in this example the label is 720947 decimal, which is 00 0b  00
> 33 in hex, which means VPI=11 and VCI=51.) I don't know if it is useful to
> display a label value as VPI/VCI also if the number is in the legal range of
> the ATM VPI/VCI numbers. (Maybe with a comment like "in case of ATM label
> VPIxx/VCIxx" or something like this...) I really don't kow this would be
> useful or embarrassing...
> 
> The devices in this conversation are:
> 
> Alcatel 7470 ATM switch configured as LSR (200.0.0.2)
> Juniper (ex-Unisphere) ERX as LER (200.200.200.200, 200.0.0.1)
> 
> The interconnection is STM-1 ATM.
> 
> Regards,
> 
> Gabor
> 
> 
> 
> _____________________________________
> SIEMENS
> 
> Gábor Szabó 			Tel: +36 1 471-2772
> Siemens Telefongyár Kft		Fax:+36 1 471-2542
> ICN TSS					E-mail: Gabor.Szabo@xxxxxxxxxx
> H-1143 Budapest
> Gizella út 51-57.
> Hungary
> 
> 
> 
> -----Original Message-----
> From: Ashok Narayanan [mailto:ashokn@xxxxxxxxx]
> Sent: Thursday, October 17, 2002 6:08 PM
> To: Szabó Gábor ICN E E/S
> Cc: ethereal-dev@xxxxxxxxxxxx
> Subject: Re: [Ethereal-dev] RSVP-TE decode problem
> 
> 
> 
> 
> Thanks for pointing it out. I will make the necessary changes. Can you
> send me the capture file so that I can verify the code?
> 
> Also, what hardware/software are you using that generates this sort of
> label request? 
> 
> Thanks
> -Ashok
> 
> On Thu, Oct 17, 2002 at 09:42:48AM +0200, Szabó Gábor ICN E E/S wrote:
> >  Dear Ladies/Sirs,
> >  
> >  I am a happy user of Ethereal, I am pleased with it very much. Using the
> > program I have found a little RSVP-TE decode problem. Since I was not able
> > to found a definite bug report mail address in the Ethereal web site, my
> > only guess was to send it to this list.
> >  
> >  In an RSVP-TE PATH message there is a LABEL REQUEST object, as RFC 3209
> > defines at page 18:
> >  
> >  "4.2. Label Request Object
> >  
> >     The Label Request Class is 19.  Currently there are three possible
> >     C_Types.  Type 1 is a Label Request without label range.  Type 2 is a
> >     label request with an ATM label range.  Type 3 is a label request
> >     with a Frame Relay label range."
> >  
> >  My Etherael 0.9.7 (C) on Windows 2000 decodes a Label REQUEST object with
> > C-type=2 is as unknown:
> >  
> >      LABEL REQUEST
> >          Length: 16
> >          Class number: 19 - LABEL REQUEST object
> >          C-type: Unknown (2)
> >          Data (12 bytes)
> >  
> >  
> > I saved the capture file in Sniffer format, so I can read it with the
> > Acterna (ex-WG) Examine application which is decodes it correctly,az shown
> > below:
> >  
> >                                          ----- RSVP Object -----
> >                              Object Length : 16
> >                                 Class Name : 19 (Label Request)
> >                                     C-Type : 2 (ATM)
> >                                  Ethertype : 0x0800 (IP)
> >                                      Flags : 0x00
> >                                              0... .... = NOT Capable of
> > Merging in the data plane
> >                                Minimum VPI : 11
> >                                Minimum VCI : 51
> >                                Maximum VPI : 11
> >                                Maximum VCI : 70
> >  
> >  
> > Since I'm not a software developer, I can not correct the problem myself.
> On
> > the other side every little improvement makes our favourite software even
> > better!
> >  
> > Best regards,
> >  
> > Gabor Szabo
> > 
> >  
> > P.S. If it is necessary, I can send the capture file, just I do not want
> to
> > "spam" the whole list with the attachment...  :-)
> > 
> > 
> > _______________________________________________
> > Ethereal-dev mailing list
> > Ethereal-dev@xxxxxxxxxxxx
> > http://www.ethereal.com/mailman/listinfo/ethereal-dev
> 
> -- 
> 
> 
> 
> --- Asok the Intern ----------------------------------------
> Ashok Narayanan
> IOS Network Protocols, Cisco Systems
> 250 Apollo Drive, Chelmsford, MA 01824
> Ph: 978-497-8387.  Fax: 978-497-8513 (Attn: Ashok Narayanan)
>