* 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.