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mpls_traceroute [2014/02/08 17:33] – 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
- 1  neufbox (192.168.1.1)  1.804 ms  1.718 ms  1.510 ms + 1  neufbox  1.804 ms  1.718 ms  1.510 ms 
- 2  129.112.16.109.rev.sfr.net (109.16.112.129)  28.440 ms  34.535 ms  28.499 ms + 2  129.112.16.109.rev.sfr.net  28.440 ms  34.535 ms  28.499 ms 
- 3  77.56.66.86.rev.sfr.net (86.66.56.77)  28.384 ms  29.678 ms  27.561 ms + 3  77.56.66.86.rev.sfr.net  28.384 ms  29.678 ms  27.561 ms 
- 4  185.73.66.86.rev.sfr.net (86.66.73.185)  30.758 ms  30.744 ms  29.597 ms + 4  185.73.66.86.rev.sfr.net  30.758 ms  30.744 ms  29.597 ms 
- 5  renater-ix1.sfinx.tm.fr (194.68.129.102)  37.389 ms  38.937 ms  41.514 ms + 5  renater-ix1.sfinx.tm.fr  37.389 ms  38.937 ms  41.514 ms 
- 6  te4-2-rouen-rtr-021.noc.renater.fr (193.51.189.50)  41.297 ms  42.737 ms * + 6  te4-2-rouen-rtr-021.noc.renater.fr  41.297 ms  42.737 ms * 
- 7  te4-2-caen-rtr-021.noc.renater.fr (193.51.189.45)  42.710 ms  41.381 ms  40.157 ms + 7  te4-2-caen-rtr-021.noc.renater.fr  42.710 ms  41.381 ms  40.157 ms 
- 8  te1-5-rennes-rtr-021.noc.renater.fr (193.51.189.53)  42.530 ms  43.130 ms  43.615 ms + 8  te1-5-rennes-rtr-021.noc.renater.fr  42.530 ms  43.130 ms  43.615 ms 
- 9  * u-1-rennes-cri-gi8-1-rennes-rtr-021.noc.renater.fr (193.51.184.25)  46.353 ms  41.514 ms + 9  * u-1-rennes-cri-gi8-1-rennes-rtr-021.noc.renater.fr  46.353 ms  41.514 ms 
-10  frontalhttp.univ-rennes1.fr (129.20.126.100)  42.702 ms  41.322 ms  42.429 ms+10  frontalhttp.univ-rennes1.fr  42.702 ms  41.322 ms  42.429 ms
 </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)
Line 31: Line 31:
     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)
Line 50: Line 50:
 </code> </code>
  
-[[http://www.bitwizard.nl/mtr | MTR]] is an adapted tool for capturing the MPLS label switching with a traceroute-like command:+[[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