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mpls_traceroute [2014/02/08 17:34] – samermpls_traceroute [2014/02/15 23:38] (current) – 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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 </code> </code>
  
-Examining the detail of the received ICMP TTL exceeded packets with Wireshark reveals an ICMP Mutli-part extension that carries the MPLS label.+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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     Code: 0 (Time to live exceeded in transit)     Code: 0 (Time to live exceeded in transit)
     Checksum: 0x3974 [correct]     Checksum: 0x3974 [correct]
-    Internet Protocol Version 4, Src: 192.168.1.24 (192.168.1.24), Dst: 131.254.254.131 (131.254.254.131)+    Internet Protocol Version 4, Src: 192.168.1.24, Dst: 131.254.254.131
     User Datagram Protocol, Src Port: 46416 (46416), Dst Port: 33452 (33452)     User Datagram Protocol, Src Port: 46416 (46416), Dst Port: 33452 (33452)
     Data (24 bytes)     Data (24 bytes)
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 </code> </code>
  
-[[http://www.bitwizard.nl/mtr | MTR]] is an adapted tool for capturing the MPLS label switching with a traceroute-like command:+In order to easily visualise the label switching, [[http://www.bitwizard.nl/mtr | MTR]] produces a traceroute-like result with labels used at each hop:
  
-<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.1391877289.txt.gz · Last modified: 2014/02/08 17:34 by samer