North American Network Operators Group|
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Re: DNS DOS increasing?
>> I've been seeing some strange problems in DNS lately (named 8.2.4-REL) >> where the nameserver stops resolving certain sites. During >> investigation I noticed that my query rate is way up. Many more DNS >> requests than normal are hitting my servers. Is anyone else seeing >> anything like this? > > Could just be that someone || groupd of people, have decided to use your > DNS servers as their own for resolving queries? > I've seen DOS-type behavior where a client will query a resolver for a name that doesn't exist, and the client does not accept the answer that the name does not exist and immediately sends another query, regardless of whether or not the resolver declared itself authoritative for the negative answer. -- /ak