Had an issue today on the ISP end. Lost connectivity to several sites. The issue was routing between my ISP and the destinations. We have two data centers but are stuck with one ISP. In a better world we should use a datacenter that has more than one ISP. Alternatively use two separate data centers with different ISPs. This way if you hit a routing issue you can fail over to the other site and other ISP.
When pinging one of the public IP's I was trying to reach I got the message Time to live exceeded from an IP near where my traffic exits the ISP network onto the internet. From researching the message it points towards a routing loop. The ISP claimed an attack was causing the issue, but maybe someone just made a mistake.
Looking glasses can be helpful to spot BGP issues with your ISP
This one is from BT
http://lg.as2110.net/
Look up the destination IP and compare the result to your own ISP.
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