Re: MPLS Echo Packet containing FEC stack change Sub-TLV in DDMAP TLV is not decoded by wireshark or https://hpd.gasmi.net/

[Jaap Keuter <jaap.keuter () xs4all nl>]

Hi,

Thanks for the illustrative capture files. There's nothing better then to have that, so that we can look straight at 
the problem.
I've used them to open an issue here: https://gitlab.com/wireshark/wireshark/-/issues/17868 which I can use to resolve 
the problem.

Thanks,
Jaap



> Op 10-01-2022 17:13 schreef max payne.. <pankaj.knitcs1 () gmail com>:
>
>
> Hi Jaap,
>
> Thanks for your response.
> Please find the attached wireshark capture for "multiple FEC stack change TLV" and "FEC stack change with Target FEC 
> TLV" not decoded properly.
> Also the bytes sent in mail below are complete encapsulation with all headers and those bytes can be directly copied 
> to online hex-decoder for a quick look.
>
>
> On Fri, Jan 7, 2022 at 12:31 PM Jaap Keuter <jaap.keuter () xs4all nl mailto:jaap.keuter () xs4all nl > wrote:
>
> > Hi,
> >
> > The immediate response by Alexis was to open an issue on the Wireshark issue tracker.
> > My response would be to attach a small sample capture file with the packets, instead of some bytes or screenshot to 
> > the email.
> >
> > Can you do either of those?
> >
> > Jaap
> >
> >
> >
> > > On 6 Jan 2022, at 06:31, max payne.. <pankaj.knitcs1 () gmail com mailto:pankaj.knitcs1 () gmail com > wrote:
> > >
> > > Hi Team,
> > >
> > > I have not got the resolution for the issue below.
> > >
> > > This was the link provided to me.
> > > https://www.wireshark.org/mailman/confirm/wireshark-dev/d4b89dd02f824a954e2e3ffa37151bf0f7ebacbc
> > >
> > > On Fri, Dec 3, 2021 at 12:27 AM max payne.. <pankaj.knitcs1 () gmail com mailto:pankaj.knitcs1 () gmail com > 
> > > wrote:
> > >
> > > > Hi,
> > > >
> > > > This is to inform you that we are supporting FEC Stack Change Sub-TLV in DDMAP TLV. I have Hex Dump, which is 
> > > > correct as per my understanding but it is not getting decoded on Wireshark or Online Decoder.
> > > >
> > > > Please let me know if the latest Wireshark  "Version 3.6.0 (v3.6.0-0-g3a34e44d02c9)" supports the following 
> > > > (RFC 8029  3.4.1.3 https://datatracker.ietf.org/doc/html/rfc8029#section-3.4.1.3 . FEC Stack Change Sub-TLV) :-
> > > > 1) Multiple FEC stack change sub-TLV in DDMap TLV, whereas single FEC stack change TLV is decoded properly. 
> > > > Please find the HEX dump below.
> > > > 2) FEC stack change sub-TLV along with FEC stack sub-TLV in DDMap TLV is not decoded properly. Please find the 
> > > > HEX dump below.
> > > >
> > > > I am having following HEX Dump, which is not getting decoded properly on wireshark or online decoder 
> > > > "https://hpd.gasmi.net/";
> > > >
> > > >
> > > > Two  FEC stack Sub-TLV in DDMAP TLV not decoded properly on wireshark or on https://hpd.gasmi.net/
> > > > Ethernet:   18 92 a4 55 71 04 00 23 8a fb c2 04 81 00 00 d4
> > > > 08 00
> > > >
> > > > IP: 45 00
> > > > IP Len: 00 68
> > > > 71 a5 00 00 ff 11 29 a4 07 07
> > > > 07 07 09 09 09 09
> > > >
> > > > UDP: 0d af 0d af
> > > > UPD Len: 00 54
> > > > a8 b1
> > > >
> > > > ECHO: 00 01
> > > > 00 00 02 02 08 02 00 00 00 16 00 00 00 03 e4 ae
> > > > 50 eb 6f c5 47 9d e4 ae 50 eb 70 2a dc 4c
> > > >
> > > > DDMAP: 00 14 00 28
> > > > 05 dc 01 02 d2 01 01 01 d2 01 01 01 00 00
> > > > SUB-Len: 00 18
> > > >              
> > > > Stack-chg Type: 00 03 00 08
> > > > Value : 02 01 00 00
> > > > 06 06 06 06
> > > >
> > > > Stack-chg Type: 00 03 00 08
> > > > Value : 02 01 00 00
> > > > 07 07 07 07
> > > >
> > > > FEC stack change sub-TLV with FEC sub-TLV (IGP IPV4 Prefix Segment TLV) not decoded properly on wireshark or on 
> > > > https://hpd.gasmi.net/.
> > > >
> > > > Ethernet:   18 92 a4 55 71 04 00 23 8a fb c2 04 81 00 00 d4
> > > > 08 00
> > > >
> > > > IP: 45 00
> > > > IP Len: 00 68
> > > > 71 a5 00 00 ff 11 29 a4 07 07
> > > > 07 07 09 09 09 09
> > > >
> > > > UDP: 0d af 0d af
> > > > UPD Len: 00 54
> > > > a8 b1
> > > >
> > > > ECHO: 00 01
> > > > 00 00 02 02 08 02 00 00 00 16 00 00 00 03 e4 ae
> > > > 50 eb 6f c5 47 9d e4 ae 50 eb 70 2a dc 4c
> > > >
> > > > DDMAP: 00 14 00 28
> > > > 05 dc 01 02 d2 01 01 01 d2 01 01 01 00 00
> > > > SUB-Len: 00 18
> > > >              
> > > > Stack-chg Type: 00 03 00 08
> > > > Value : 02 01 0c 00
> > > > 06 06 06 06
> > > >
> > > > FEC TLV Type: 00 0e 00 08
> > > > Value : 01 01 01 01
> > > >  20 00 00 00
> > > >
> > > > Whereas multiple Label-Stack sub-TLV in DDMap TLV is getting properly decoded on https://hpd.gasmi.net/
> > > > Ethernet: 18 92 a4 55 71 04 00 23 8a fb c2 04 81 00 00 d4
> > > > 08 00
> > > >
> > > > IP: 45 00
> > > > IP Len: 00 60
> > > > 71 a5 00 00 ff 11 29 a4 07 07
> > > > 07 07 09 09 09 09
> > > >
> > > > UDP: 0d af 0d af
> > > > UPD Len: 00 4C
> > > > a8 b1
> > > >
> > > > MPLS Echo: 00 01
> > > > 00 00 02 02 08 02 00 00 00 16 00 00 00 03 e4 ae
> > > > 50 eb 6f c5 47 9d e4 ae 50 eb 70 2a dc 4c
> > > >
> > > > DDMAP: 00 14 00 20
> > > > 05 dc 01 02 d2 01 01 01 d2 01 01 01 00 00
> > > > SUB-Len: 00 10
> > > >                
> > > > Label-S: 00 02 00 04
> > > > 00 00 30 06
> > > >
> > > > Label-S: 00 02 00 04
> > > > 00 00 30 06
> > > >
> > > > --
> > > > Pankaj Verma
> > >
> > >
> > > --
> > > Pankaj Verma
> > > ___________________________________________________________________________
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>
> --
> Pankaj Verma
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