Memory leak cause of Comcast DNS problems
Florian Weimer
fw at deneb.enyo.de
Sun Apr 17 16:29:27 UTC 2005
* Sean Donelan:
> Perhaps your DNS software also has a memory leak? Anyone know which
> software Comcast was using? Should other ISPs be concerned they might
> have the same latent problem in their systems?
Probably yes, especially if they don't read documentation of their DNS
software.
| The maximum amount of memory to use for the server's cache, in
| bytes. [...] The default is unlimited, meaning that records are
| purged from the cache only when their TTLs expire.
The number of complaints I've heard that "DNS resolvers eat *so* much
memory" suggests that few people tweak the default configuration. 8-(
However, it's unlikely that this was the cause of Comcast's problems
because DNS cache overflows would have an impact on a much larger
scale.
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