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A colleague of mine is not fond of backup <acronym title="Mail eXchange">MX</acronym> hosts. He (correctly) points out that all incoming mail should be transmitted through another mail server anyway, so the backup MX hosts only serves as an attack point for spammers.

For the most part I …

I've written a lot of posts about various methods for blocking <acronym title="Peer-to-Peer">P2P</acronym> traffic, especially with Cisco's Network Based Application Recognition (NBAR). Although these posts are probably of interest to smallish Internet Service Providers and administrators of business networks, they don't have much use for the average …

During a recent project, I was asked to configure a Linksys SPA942 4-Line IP Telephone to work with Asterisk in an medium-sized office environment. Since this phone was going to be one of many used in a corporate environment, I decided I would need one master configuration, and then individual …

I recently started messing around with building my own Facebook application. I figured the best way to start learning was to download the demo application and get it working on the Slaptijack web server. I quickly ran into a problem:

PHP Fatal error:  Call to undefined function json_encode()

The problem …

If you've been reading Slaptijack for a while, you might remember that I've been doing personal backups with rsync and hard links. The hard links conserve disk space by making sure I don't have multiple copies of the same file lying around.

I recently added a new drive to my …

Best Practical Solutions has announced the release of version 3.6.6 of their popular ticket tracking system, RT: Request Tracker. This release appears to be a bug fix and enhancement release. I've included a list of changes below.

If you have a question about administering, using, or coding for …

Error: The image in the archive which would be used to upgrade
Error: system number 1 does not support the same feature set.

I just got this error message while upgrading a Cisco Catalyst 3560 from 12.2(35)SE5 to 12.2(44)SE. The older version was IP …

Oops! I guess I'm way behind the times.

For quite a while, I've been using ip verify unicast reverse-path to prevent packets with spoofed source addresses from crossing my routers. Apparently, as of IOS 12.0 (12.4 is current as of this writing), that command has been replaced with …

"How do I find a Cisco serial number remotely through the command line?"

This is one of those frequently asked questions that I see over and over. So, here's the quick and dirty answer:

You can find Cisco serial numbers from the IOS command line by using the show inventory …

This might be a bug with the particular version of Asterisk 1.2 I'm using, but it's pretty darn annoying. Hopefully, it doesn't effect you if you are using the latest version of 1.2 or 1.4.

What I'm trying to do is play some background music while I …

Note: This is part of a discussion regarding the configuration of a Cisco AS5300 for T.37 Store and Forward Faxing.

The final piece of the T.37 Store and Forward Fax configuration is the dial peers to handle the incoming fax and the outgoing email. I'll walk you through …

Note: This is part of a discussion regarding the configuration of a Cisco AS5300 for T.37 Store and Forward Faxing.

Unfortunately, the Cisco AS5300 does not have the ability to handle incoming fax processing without the help of additional software. You can download the app_faxmail_onramp TCL script from the …

I was recently engaged to configure a fax-to-email solution using a Cisco AS5300 and Asterisk. My original idea was to compile spandsp into Asterisk and use the RxFax() application to receive faxes. Everything seemed to work OK on the Asterisk side, but I had a lot of trouble with incoming …

From all of us here at Slaptijack, Merry Christmas to you and yours.