slaptijack

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 …

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 …

Note: Now that Google is hosting email domains for free, it has become an interesting alternative for both new and old domains. As always, I've changed the names to protect those affected.

Transitioning a domain to Google can be an arduous task. Once you have set up the domain with …

XHTML Character Entity Reference

Digital Media Minute's Jim Rutherford has developed an invaluable reference in his XHTML Character Entity Reference. With this reference in hand, I can finally ditch all my little notes about copyrights, trademarks, and cedillas. Here's an explanation of how the page works in Jim's own …

Deciding whether to use <acronym title="Remote Authentication Dial-In User Service">RADIUS</acronym> or <acronym title="Terminal Access Controller Access Control System Plus">TACACS+</acronym> for <acronym title="Authentication, Authorization, Accounting">AAA</acronym> functionality on a Cisco-based network seems straight-forward. After all, if the network uses Cisco, shouldn't the AAA …

Important commands: sips

A few folks have asked me where I got the nice looking Software Update icon for my post regarding Apple's Security Update 2007-004. First, let me say, "Thanks for noticing!" Second, let me point out that Steve Jobs will probably be knocking on the door of the …

You've probably been using Postfix and ClamAV for a long time. Prior to Postfix 2.3, you had to have an AMaViS daemon running to act as the glue between Postfix and ClamAV.

As of version 2.3, Postfix now supports Sendmail 8 Milter protocol. Now you can cut AMaViS …