Scalability Blog

Scaling tips, insights, updates, culture, and more from our Server Experts.
 

Protecting Your Managed Server From Packet Flood

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There are instances when your DNS server, such as BIND or PowerDNS, comes under a heavy packet flood.  Here is a network activity on two nameservers undergoing UDP flooding to port 53:
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To mitigate this issue, we need to do a little investigation as to where the packets are coming from.  Tcpdump is an excellent tool for …