[GLLUG] traceroute MPLS messages

[Alain Williams]

Yesterday evening my ISP (EntaNet) had problems and I lost connectivity for 6+ hours.

I was away (Floss UK conference in Newcastle -- which was good BTW) and logged
into my bytemark box to see what was up. I could not ping home & tried a
traceroute, the output is below.

I am not a networking wizard, would someone be able to explain (simply) what the
MPLS lines are all about. The wikipedia article on MPLS gives me vague clue, but
doesn't help with interpretation.

Thanks in advance.


$ traceroute mint
traceroute to freshmint.phcomp.co.uk (78.32.209.33), 30 hops max, 38 byte packets
 1  80-68-91-1.no-reverse-dns-set.bytemark.co.uk (80.68.91.1)  0.693 ms  0.560 ms  0.380 ms
 2  89-16-188-38.no-reverse-dns-set.bytemark.co.uk (89.16.188.38)  0.828 ms  1.061 ms  1.564 ms
 3  te3-3.cr02.man.bytemark.co.uk (91.223.58.78)  0.945 ms  0.881 ms  0.817 ms
 4  gi2-25.man.core.enta.net (212.121.34.72)  0.962 ms  20.284 ms  20.137 ms
 5  te5-1.telehouse-north0.core.enta.net (87.127.236.109)  7.700 ms  7.499 ms  8.569 ms
     MPLS Label=9051 CoS=6 TTL=1 S=0
 6  te5-2.gs1.core.enta.net (87.127.236.42)  7.513 ms  10.063 ms  8.835 ms
     MPLS Label=388 CoS=6 TTL=1 S=0
 7  te1-1.interxion.core.enta.net (87.127.236.86)  7.777 ms  7.653 ms  7.593 ms
 8  * te2-3.interxion.dsl.enta.net (87.127.236.210)  8.220 ms *
 9  * * *

-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/
Parliament Hill Computers Ltd. Registration Information: http://www.phcomp.co.uk/contact.php
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