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mpls_traceroute [2014/02/08 21:34] samermpls_traceroute [2014/02/08 21:36] samer
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 For example, a traceroute to ''www.univ-rennes1.fr'' reveals the different hops toward the destination: For example, a traceroute to ''www.univ-rennes1.fr'' reveals the different hops toward the destination:
  
-<code>+<code shell>
 $ traceroute -P icmp www.univ-rennes1.fr $ traceroute -P icmp www.univ-rennes1.fr
 traceroute to frontalhttp.univ-rennes1.fr (129.20.126.100), 64 hops max, 72 byte packets traceroute to frontalhttp.univ-rennes1.fr (129.20.126.100), 64 hops max, 72 byte packets
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 Examining the detail of the received ICMP time exceeded messages with Wireshark reveals an ICMP Multi-part extension that carries the MPLS label as it arrived to the hop sending the message. In the following capture, the router ''te4-2-rouen-rtr-021.noc.renater.fr'' received label 53, most probably from the MPLS edge router ''renater-ix1.sfinx.tm.fr''.   Examining the detail of the received ICMP time exceeded messages with Wireshark reveals an ICMP Multi-part extension that carries the MPLS label as it arrived to the hop sending the message. In the following capture, the router ''te4-2-rouen-rtr-021.noc.renater.fr'' received label 53, most probably from the MPLS edge router ''renater-ix1.sfinx.tm.fr''.  
  
-<code>+<code shell>
 No.     Time           Source                Destination           Protocol Length Info No.     Time           Source                Destination           Protocol Length Info
      41 5.947446000    193.51.189.50         192.168.1.24          ICMP     182    Time-to-live exceeded (Time to live exceeded in transit)      41 5.947446000    193.51.189.50         192.168.1.24          ICMP     182    Time-to-live exceeded (Time to live exceeded in transit)
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 [[http://www.bitwizard.nl/mtr | MTR]] is a traceroute-like tool that enables to visualise the label switching: [[http://www.bitwizard.nl/mtr | MTR]] is a traceroute-like tool that enables to visualise the label switching:
  
-<code> +<code shell
-$mtr -e www.univ-rennes1.fr+$ mtr -e www.univ-rennes1.fr
  1. neufbox  1. neufbox
  2. 129.112.16.109.rev.sfr.net  2. 129.112.16.109.rev.sfr.net
mpls_traceroute.txt · Last modified: 2014/02/15 23:38 by samer