slaptijack

When calling an AGI from inside your dialplan, you can pass variables to your AGI via the AGI() application call. The AGI() application takes parameters in the following format (note the ';' is only necessary in AEL:

AGI(command|ARG1|ARG2|ARGn);

The additional arguments are useful when passing in non-channel …

In a Metro Ethernet network, the possibility exists for a lot of NetBIOS broadcasts if your users are connecting directly to the ring rather than through a firewall. My first assumption was that most users would have a firewall, but this is really only guaranteed in the case of business-class …

Many network administrators already know how to use tools like Cacti or MRTG to monitor the usage on their network links. (If you don't, let me know and I'll show you how.) Unfortunately, those tools only reveal part of the story. They show you how much traffic is traversing a …

You may recall that I recently entered a post in Pro Blogger's Top 5 Group Writing Project. Now that the project is complete, here's a list of interesting technogolgy entrants.

• Top 5 Steps to Securing your Data by Geoff R
• Definitive Guide for Geeks to Time Pass at Work …

John Chow dot Com is a blog that helps you make money online. If you do a review of his blog, he'll link to you so his readers can check you out. There, I said it.

Actually, John Chow really isn't evil, but he is a genius at working the …

I recently came across Railscasts via Digital Media Minute (that name might sound familiar thanks to Jim's XHTML Character Entity Reference).

Ryan Bates hosts individual episodes three times a week delivering tips and tricks for Ruby on Rails. Each screencast is less than ten minutes long and requires Quicktime for …

A historical list of Mac OS X administration utilities whose discontinued NetInfo guidance needs replacement with modern macOS workflows.

As discussed previously, we're going to enable RFC 1323 Window Scaling and increase the default TCP receive and send windows to 1 MB. By default Windows 2000 and XP do not offer window scaling options, but will accept them if offered by the other side. To make our changes, we'll …

As we have throughout the TCP Performance Tuning series, we're going to make sure RFC 1323 Window Scaling is enabled and increase our send and receive window size to 1 MB. The ndd command is the Solaris equivalent of sysctl in FreeBSD/Linux/Mac OS X.

sudo ndd -set /dev …

Because Darwin is BSD-based, it's no surprise that Mac OS X TCP Performance Tuning is very similar to FreeBSD TCP Performance Tuning. It is no longer necessary to enable RFC 1323 TCP Extensions (in fact, the option to do so is gone). Also, we'll set the TCP send and receive …

If you have been following our TCP Performance Tuning series, you'll know that we want to enable RFC 1323 Window Scaling and increase the TCP window size 1 MB. To do this, we'll add the following lines to /etc/sysctl.conf and issue sudo sysctl -p to apply the changes …

In TCP window scaling and broken routers posted in July of 2004, LWN.net's corbet points out that certain routers are setting the RFC 1323 window scale to 0. This effectively sets the TCP window size for the transmission to the minimum value and greatly inhibits performance. As corbet notes …

The original TCP specification included a window size no larger than 64 KB. This limitation was introduced by the 16 bit header that specified window size. To achieve the recommended 1 MB window size, RFC 1323 TCP extensions must be enabled. The rest of this post is a somewhat detailed …

Trying to debug an <acronym title="Asterisk Gateway Interface">AGI</acronym> 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 …