Network flood

A traffic flood from a research group machine caused some network performance problems between sometime in the small hours of Thursday 2nd December and about 09:40 when the source was identified and disconnected. Our use of VLANs to separate traffic did a reasonable job of confining the problem, but there were a few knock-on effects; in particular one of the DNS resolvers found itself behind an overloaded link causing slow name lookups. Some overnight jobs may have misbehaved as a consequence.

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