IX2015を使ってるんだけど、ログに下記のようなメッセージが3〜5秒毎にずっと記録されてるんだけど、これってなに？
2015/03/02 03:17:20 DNS.048: Response has not been created by CACHE: no entry
2015/03/02 03:17:20 DNS.048: Response has not been created by CACHE: no entry
2015/03/02 03:17:20 DNS.048: Response has not been created by CACHE: no entry
2015/03/02 03:17:20 DNS.048: Response has not been created by CACHE: no entry
2015/03/02 03:17:20 DNS.048: Response has not been created by CACHE: no entry
2015/03/02 03:17:24 DNS.048: Response has not been created by CACHE: no entry
2015/03/02 03:17:26 DNS.048: Response has not been created by CACHE: no entry
2015/03/02 03:17:27 DNS.048: Response has not been created by CACHE: no entry