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

["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> 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> 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>
> 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/ <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/
> > <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/ <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
> ___________________________________________________________________________
> Sent via:    Wireshark-dev mailing list <wireshark-dev () wireshark org>
> Archives:    https://www.wireshark.org/lists/wireshark-dev
> Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-dev
>             mailto:wireshark-dev-request () wireshark org?subject=unsubscribe
> <wireshark-dev-request () wireshark org?subject=unsubscribe>

-- 
Pankaj Verma

Attachment: multiple_fec_stack_change_tlv.pcap
Description:

Attachment: fec_stack_change_with_target_fec_tlv.pcap
Description:

___________________________________________________________________________
Sent via:    Wireshark-dev mailing list <wireshark-dev () wireshark org>
Archives:    https://www.wireshark.org/lists/wireshark-dev
Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-dev
             mailto:wireshark-dev-request () wireshark org?subject=unsubscribe