TCP Traffic Analyzer (Yahoo! Developer Network Blog) – You probably have questions like these about traffic on a TCP (Transmission Control Protocol) server (or client):<br /> <br /> * How many connections lasted more (or less) than X milliseconds?<br /> * How many connections needed more than N attempts to succeed?<br /> * What is the distribution of connection duration or connection throughput?<br /> * What is the distribution of connection duration or throughput for connections in which the server or client sent more than N bytes?<br /> * What specific IP addresses and ports had connections that lasted between 50 and 100 milliseconds long?<br /> <br /> You can get answers to these questions (and more) using Yahoo!'s TCP Traffic Analyzer (yconalyzer), available as an open-source project via free download.
These are my links for 8 apr 2010 through 14 apr 2010:
email@example.com – shell script, appunti e note su sed, awk, sun e cluster, oracle, iptable e altro in italiano!
Fun with Sendmail on AIX – Summary: Using Sendmail on AIX® may be considered a thing of the past, with all the available choices for mail servers on the market. However, Sendmail still has its uses. This article provides some tips and tricks for using Sendmail on AIX.
These are my links for 17 feb 2010 through 18 feb 2010:
Puppet is system administration – Automated. – Puppet is a declarative language for expressing system configuration, a client and server for distributing it, and a library for realizing the configuration. By saving you countless hours of frustration, monotony, and/or reinventing the wheel, Puppet can change your life. Here are some key points about Puppet: Puppet lets you perform normal administrative tasks (such as adding users, installing packages, and updating server configurations) on any number of systems, even if those systems are running completely different operating systems. Through the use of providers, Puppet takes a generic instruction from you (such as ensuring MySQL is installed) and performs the task the "right way" for each system. Whether you have a small, heterogeneous network of user workstations or a cluster of rack-mounted number-crunchers, Puppet can help reduce your overhead and get the everyday management of your network under control so you can concentrate on the real problems.
These are my links for 11 feb 2010 through 12 feb 2010:
pwnat – NAT to NAT client-server communication – pwnat, pronounced "poe-nat", is a tool that allows any number of clients behind NATs to communicate with a server behind a separate NAT with *no* port forwarding and *no* DMZ setup on any routers in order to directly communicate with each other. The server does not need to know anything about the clients trying to connect.
Unix File and Directory Permissions and Modes – Unix and Linux systems (including Mac OS X and other POSIX compliant systems) have a (relatively) simple system for controlling access to files and directories. This system is defined in POSIX.1:2008 standard external link, also known as the Single Unix Specification (SUS version 4). And since devices such as disks, ports, etc. have file names (under /dev) you control access to them the same way. (Note Windows systems up through Windows ME don't support permissions, just a "read only" attribute.)
Il pane, qui : A totanus in the net – Il pane qui si fa – ma non si cuoce – con la macchina del pane. La macchina, infatti, fa molto bene la parte faticosa di impastare, ma fa molto male la parte rilassante del dare forma e cuocere[...]