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The following figures shows the rate of UDP DNS queries and responses of a traffic passing a router. DNS query is a DNS packet with query/response flag set to 0 in header and DNS response the one with the flag set to 1.

  1. Why is there a constant imbalance between them?
  2. What are those jumps of about 30 minutes interval in responses?

Fig. 1: The graph over the period of 4 days: Fig. 1: The graph over the period of 4 days.

Fig. 2: The graph over the period of 12 days: Fig. 2: The graph over the period of 12 days.

I read about DNS tunneling, but that is about the difference between the bandwidth of the queries and responses.

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Can you add more details? Are you looking at traffic for DNS servers that you are managing? Are you experiencing any resolving issues? Are you looking at solving a specific issue? –  Alex Feb 22 '13 at 16:03
    
These graphs are for the traffic passing a country and internet. So I don't know whether there is an issue, any attack or else about them. There are clients and DNS servers at either side. –  Yas Feb 22 '13 at 16:12

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