[CentOS] What can I do to UNDERSTAND why I can't reach centos.org (but everyone else can)?

Fri Mar 1 16:27:12 UTC 2013
Les Mikesell <lesmikesell at gmail.com>

On Fri, Mar 1, 2013 at 10:19 AM, Rock <RockSockDoc at gmail.com> wrote:
>>> try a traceroute to tempotv.com.tr,
>>> which takes 23 hops from my computer.
>
> For the record, I was unable to get to any of these long-hop destinations:
> $ traceroute tempotv.com.tr ==> died on the 23rd hop
> $ traceroute -I www.centos.org ==> died on the 19th (penultimate) hop
> $ traceroute www.gu.ac.ir ==> Iran, died on the 22nd hop
> $ traceroute www.gu.edu.pk ==> Pakistan, made it only to the 19th hop
> $ traceroute -m 255 www.tourism.gov.my ==> Malaysia died on the 19th hop
>
> All the above died before reaching their destinations.

Note that traceroute requires a round-trip for you to see success.  A
failure is almost as likely to mean that the router where it stops
does not have a route back to the source as that it can't reach the
next forward hop.    Those 'looking glass' sites can show you if the
bgp routes are propagating to various locations.

-- 
   Les Mikesell
     lesmikesell at gmail.com