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NetFlow Traffic Analyzer (NTA)

Forum High Volume of DNS Reverse Lookup Requests

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High Volume of DNS Reverse Lookup Requests

rdronia over 15 years ago

The IPS/IDS is reporting a flood of DNS requests coming from the SolarWinds server which I realize is associated with NetFlow. The volume is such that it actually puts a certain amount of stress on the IPS/IDS appliance although it doesn't appear to be service affecting. Curiously the event starts at exactly the same time every 48 hours and runs for 2 to 2 and half hours. Apparently this is a scheduled activity so does anyone know how to implement a change to the schedule?

0 bishop7 over 15 years ago

I've seen similar activity, although it doesn't seem to be scheduled for us -- it's a constant stream of requests. Incidentally, why do you feel it's related to Netflow? I assumed the activity was from the Orion server polling the hostname using SNMP, thus necessitating all the DNS lookups.
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0 rdronia over 15 years ago in reply to bishop7

I believe it's related to Netflow because I started witnessing this activity after we installed and enabled Netflow. Also, if you refer to another post named "Flood of DNS Requests" dated 11/03/08 you'll see an entry that states "This is occuring to resolve the hostname of the ip addresses that are part of the netflow data."
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0 bishop7 over 15 years ago in reply to rdronia

Ouch.

That may explain a few things i'm seeing on my IDS as well, actually (I see tons of external DNS requests periodically through the evenings to external DNS servers -- maybe it's related somehow)

Thanks for the explanation.
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