My CentOS / RHEL based server is configured with Intel PRO/1000 network interface cards. NAPI (Rx polling mode) is supported in the e1000 driver. I’ve multiple CPUs. How do I configure NAPI, decreasing interrupts and improve overall server network performance?

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How do I configure Bind 9 dns server views to allow a single nameserver in my DMZ to make different sets of data available to different sets of clients? For example, I’d like to run recursion, some other data for LAN users (, and for the Internet user I’d like to display limited DNS data without recursion. How do I configure views to partition external (Internet) and internal (LAN) DNS information?


I‘m using Logwatch for reporting on unusual items in syslog. I’ve central logserver up and running. All other Linux servers send logs to a remote loghost called How do I configure Logwatch on the central log server so that it will send daily logs messages in a single e-mail?


How do I convert an MP3 file to WAV format under Linux using a shell prompt?


How do I set advanced security options of the TCP/IP stack and virtual memory to improve security and performance of my system? How do I configure Linux kernel to prevent certain kinds of attacks using /etc/sysctl.conf? How do I set Linux kernel parameters?


How do I set txqueuelen (the length of the transmit queue) length of the network card device under Linux? How do I set it for a high latency and/or a high speed network for bulk transfer from disturbing interactive traffic like ssh too much?


We’ve gigabit networks, and large maximum transmission units (MTU) sizes (JumboFrames) can provide better network performance for our HPC environment. How do I change MTU size under Linux?