Memory leak cause of Comcast DNS problems
David Conrad
david.conrad at nominum.com
Mon Apr 18 06:14:06 UTC 2005
Hi,
On Apr 17, 2005, at 8:20 PM, Eric A. Hall wrote:
>> | 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.
>
> That was my first guess too.
>
> Most DNS servers don't even have this switch.
Actually, I suspect most servers now do, at least in the context of
Internet service provision. I believe BINDv9 + dnscache + CNS (don't
know about maradns, powerdns, or posadis but I believe their relative
percentage isn't significant) outnumber BINDv4 and BINDv8. Don't know
if Microsoft DNS allows you to limit memory consumption, but I don't
think it is used in an ISP context that frequently (although I might be
wrong).
Rgds,
-drc
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