Re: decode MPLS-contained packets?

[Gert Doering via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Gert Doering <gert () greenie muc de>
>
> Date: Tue, 5 May 2020 18:34:40 +0200
>
> Hi,
>
> On Tue, May 05, 2020 at 04:45:04PM +0200, Francois-Xavier Le Bail wrote:
> > On 05/05/2020 12:15, Gert Doering via tcpdump-workers wrote:
> > > 12:11:46.116238 MPLS (label 105, exp 0, ttl 254) (label 24003, exp 0, [S], ttl 254) IP 10.27.99.2 > 10.27.99.34: 
> > > ICMP echo request, id 49866, seq 5160, length 84
> > > 12:11:46.117107 MPLS (label 24002, exp 0, [S], ttl 253) IP 10.27.99.34 > 10.27.99.2: ICMP echo reply, id 49866, seq 
> > > 5160, length 84
> > >
> > >
> > > So, for my debugging purposes, I have what I need now.
> >
> > Could you send a pcap file with the ICMP echo request/reply test ?
>
> Of course.  Attached.  This is EVPN/MPLS between two Cisco ASRs (in
> case it makes a difference).  One direction has only a single label
> because the final router is on the link I'm sniffing, the other direction
> has two labels.
>
> Inside are a few machines pinging around plus one or two ARPs.
>
> (The .cap file is very small, just 4 kbyte, so I dare send it to the
> list as well)
>
> > And the patch you apply ?
>
> Attached as well.  Not very smart yet, just does "what I need".
>
> gert
>
> -- 
> "If was one thing all people took for granted, was conviction that if you 
>  feed honest figures into a computer, honest figures come out. Never doubted 
>  it myself till I met a computer with a sense of humor."
>                              Robert A. Heinlein, The Moon is a Harsh Mistress
>
> Gert Doering - Munich, Germany                             gert () greenie muc de
>
> --- End Message ---
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