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CenturyLink L3 outage knocks out web giants and 3.5% of all internet traffic


I think that the global impact was down to DNS servers being taken out - DNS caching kept most things going, but the outage was so long that by the end of it, cached entries were starting to expire - and presumably the least-used ones went first.

In my case, email stopped working, and I found that the name of my mail router wasn't resolvable on Virgin Media's DNS servers. However, it was still OK on Google's DNS service (, so I switched to that. I tried and found that my mail router wasn't resolvable on roughly half of the randomly-selected DNS servers - but e.g was still resolvable on all of them

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