On Fri, 01 Mar 2013 13:57:26 +0100, Ljubomir Ljubojevic wrote:
It is worth noting that www.centos.org was inaccessible from Serbia and http://www.downforeveryoneorjustme.com/centos.org on 27.01.2013 around 16:30, for about 1-2 hours.
I can see pretty bad connectivity for Centos.org over here: http://www.isitdownrightnow.com/centos.org.html
Here's a screenshot of the results: http://www1.picturepush.com/photo/a/12306664/img/12306664.png
I'm not on any of these blacklists: http://multirbl.valli.org http://www.lookinglass.org
In addition, I had asked some friends, who reported back: APPLE:
For what it is worth I can't get to centos.org from Apple's network either. The traceroute finally gets through after 42 hops but the servers are dropping the connection immediately. Me thinks it is a centros.org problem and not an ISP issue.
MAXIM:
Ha - just checked. I can't from Maxim either.
GOOGLE:
Works OK for me from google, as long as I spell it right this time!
A neighborly friend tested similar situations:
While it is possible that the laptop had a temporary problem wherein it had set the TimeToLive (TTL) of the packets to 19, that also seems like a long shot.
However, trying a reboot if/when it happens again to rule out laptop fatigue is another test to try. Also, finding a site that has more than 20 hops would also be a test of that. It turns out it isn't all that easy to find a site with that many hops. Traceroute deliberately plays with the TTL number, so it would seem like a long shot if traceroute also showed the problem, as it does in this case.
Nonetheless, if it happens again, try a traceroute to tempotv.com.tr, which takes 23 hops from my computer.
I can get to Iran in 24 hops: traceroute www.gu.ac.ir. On the Internet, centos.org is as far away as Pakistan: traceroute www.gu.edu.pk.
Some routers drop ICMP packets when they get busy, or rate-limit the replies. You could have been trying to get to centos.org while they were being hit by a DDOS attack. Routers would automatically drop whole blocks of IPs for a short while to cope with the problem.
...and just for fun, let's try Malaysia:
C:\temp>tracert -h 255 www.tourism.gov.my
Tracing route to www.tourism.gov.my [168.63.252.50] over a maximum of 255 hops: