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Wireshark-users: Re: [Wireshark-users] MPLS over UDP decoding

From: Hugo van der Kooij <hugo.van.der.kooij@xxxxxxxxx>
Date: Fri, 28 Dec 2018 07:57:41 +0000
I would say this is a rather impossible question.
Your configuration is a relevant factor.
As is the actual packet data.

With neither of them available it is impossible to answer.

But in general disable not relevant protocols in the profile you use. I use 
various profiles where I disable not relevant protocols for the tasks at hand.

Met vriendelijke groet / With kind regards,
Hugo van der Kooij


-----Original Message-----
From: Wireshark-users <wireshark-users-bounces@xxxxxxxxxxxxx> On Behalf Of 
Yang Yu
Sent: vrijdag 28 december 2018 00:02
To: wireshark-users@xxxxxxxxxxxxx
Subject: [Wireshark-users] MPLS over UDP decoding

Hi,

In a packet capture of sFlow export packets, I noticed some sFlow samples were 
decoded as MPLS over UDP. The sFlow sampled packet was actually just a UDP 
VoIP packet with no dissector support.

What logic does Wireshark use to opportunistically consider UDP payload to be 
MPLS? Thanks.

Flow sample
Raw Packet header
  * Ethernet
  * IP
  * UDP
  * MPLS label x 6
  * 
https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fpweth.cw&c=E,1,jBOKE6kiEiJmXy1qZyhzs5EpbM6-kBmI9y-EZb-Y8lfUYXxNOZi6s-V8xTdcECfjF3A1yJpRMnpExwtUrCnb8kyXp7Lgh9f-UnEq9gYfDnLEWNOjOdHjV1ta&typo=1
  * eth (data looks wrong because it is not an actual Ethernet header)
  * data (unable to decode)


Yang
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