ISC announced the release of BIND 9.4.1 today. The release is a security update to BIND 9.4.0 which affects the following bugs

2172. [bug] query_addsoa() was being called with a non zone db.

This bug is also know as CVE-2007-2241. A sequence of […]

Categories: Security Updates

Red Hat announced the release of Security Advisory RHSA-2007:0169 which addresses several security fixes as well as a bug update for the Red Hat Enterprise Linux v.5 (server and client) kernel.
The bugs that were fixed include a memory leak in the audit subsystem (Bug 233157) and a data corruption bug affecting s390 systems.
The update addresses […]

Categories: Security Updates

Trying to debug an AGI in Asterisk can be a frustrating experience. The main problem is that STDERR only outputs to the terminal Asterisk was started from. In most cases, this means the terminal is the server console. If your Asterisk server is sitting in the room you are coding in, that’s […]

Categories: Voice

Note: Although this is a continuation of the TCP Performance Tuning article series, it’s also valuable as a standalone reference.
This is a list of 14 congestion control algorithms available in TCP. I’m presenting it in alphabetical order.

BIC TCP - Binary Increase Congestion Control, this is the default congestion control algorithm in Linux as of […]

Categories: System Administration

Note: Stanislav Shalunov wrote an excellent article on TCP over WAN Performance Tuning and Troubleshooting. In this series of articles, I want to summarize his findings and provide tuning suggestions for popular operating systems.
Most operating systems today ship with TCP stacks optimized for either LAN (high speed, low latency) or broadband (low speed, […]

Categories: System Administration