Scalability Blog

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

Protecting Your Managed Server From Packet Flood

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:
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 …

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