DNS DoS attack CentOS

Seeing a lot of this in my logs, is this a problem? client 209.205.74.234#5415: query (cache) ‘ripe.net/ANY/IN’ denied client 209.205.74.234#41921: query (cache) ‘ripe.net/ANY/IN’ denied client 209.205.74.234#64158: query (cache) ‘ripe.net/ANY/IN’ denied client 209.205.74.234#25950: query (cache) ‘ripe.net/ANY/IN’ denied client 209.205.74.234#7358: query (cache) ‘ripe.net/ANY/IN’ denied client 209.205.74.234#33800: query (cache) ‘ripe.net/ANY/IN’ denied client 209.205.74.234#50898: query (cache) ‘ripe.net/ANY/IN’ denied This […]
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