[dns-operations] Increasing the number of search path entries in a stub resolver

Paul Vixie paul at redbarn.org
Wed May 4 10:14:43 UTC 2016

Florian Weimer wrote:
> Our stub resolver currently has a hard limit for 6 search domains that
> can be specified in /etc/resolv.conf. We are considering lifting that
> limit. Apparently, this is desirable for deployments which migrate from
> NIS host name lookups to DNS because NIS supports a larger number of
> default domain names (or something equivalent to that).
>  From a larger ecosystem perspective, do you think that longer search
> paths would increase resolver load in an unacceptable way? For example,
> host name lookups with a 10-element search path could easily require 20
> queries.

above six, i'd hope you sent some or all of the queries in parallel, and 
turned on the round-robin option, to avoid server microbursts.

otherwise this sounds quite reasonable.

P Vixie

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