slaptijack

As I guessed a week ago, it was only a matter of time before the Rural Utilities Service (RUS) made its list of Round 2 BIP applications available online rather than in the previously released PDF format. The new online database coincides with the posting of Public Notice Filings. You …

One of the suggestions for improving the performance of your website is to properly set the Expire and Cache-Control headers of the HTTP response for images. Since images rarely change, the Expire time should be set far in the future. This ensures that web browsers will attempt to retrieve the …

Although Cisco now markets these phones and ATAs via their Small Business line, I still think of these devices as being Linksys. Although the software that Cisco provides for these devices comes with an upgrade executable, it is only for Windows operating systems. I have found that the easiest way …

a href="{tag}arra"></a>Both the Rural Utilities Service (RUS) and National Telecommunications and Information Administration (NTIA) have made American Recovery and Reinvestment Act (ARRA) Round 2 application data available. The RUS is currently distributing their BIP application information in a PDF directory. The NTIA, on the other hand …

Sometimes your wonderful Amazon Kindle may get hung and need a little help. How to go about issuing a hard or soft reset depends on which version of the Kindle you have.

Kindle 1 (K1)

Soft Reset: Hold down Alt-Shift-R

Hard Reset: Remove the back cover and insert a paperclip …

The default username and password for all versions of Cisco Access Registrar (as of version 5.0):

Username: admin
Password: aicuser

Perhaps this will save you a little time someday.

Note: This post is a natural continuation of my post Command Logging is Vital to System Administration.

The primary purpose of sudo is to allow system administrators to execute commands as the superuser (AKA root). It allows a group of people to manage a system without the hassle of keeping …

In the following example, I'm going to set up a Simple Network Management Protocol version 3 (SNMPv3) user on a Cisco router with limited view of the system MIB.

• Create an SNMP view that limits the user to the system MIB.

  ROUTER(config)# snmp-server view SYSTEM system included
  

• Create an …

I use Unison to keep a few directories synchronized between my various workstations and a collocated server. Unison works great, but occasionally has problems in my mixed operating system environment. The most frequent problem is

Failed: Destination updated during synchronization

This error message is not very helpful at all. Newer …

After all this time, I still love VirtualBox, the open source hypervisor from Sun (now Oracle). I use it almost everyday on my iMac to either test something in Windows XP or see what's going on in some version of Linux. It's been almost a year since the release of …

If you're using Red Hat Enterprise Linux (RHEL) or one of it's variants (CentOS, etc.), you may have noticed that using a non-standard document root for your Apache-based web site results in a DocumentRoot does not exist warning if the directory exists. The most likely cause of this problem is …

It's not often that I have to restart a Asterisk VoIP PBX. I recently upgraded to the latest version of Asterisk 1.4. After the installation was complete, I restarted the service and everything appeared to be functioning OK. Processes were running and owned by the asterisk user. When I …

In this case, gentlemen, size matters.

Yesterday, I calculated the average packet size for one of the networks I work on using data from 263986M (263,986,000,000+) packets.

Average packet size for that sample was 557 bytes.

Protocol Basics

Layer: Application Transport: <acronym title="Transmission Control Protocol">TCP</acronym> or <acronym title="User Datagram Protocol">UDP</acronym> Port(s): 5060, 5061 RFC(s): 2543, 3261

SIP (Session Initiation Protocol)

SIP is by far the most popular protocol used in VoIP communication today. SIP was designed as a …

If you have an interest in information security from a technical or managerial point of view, check out Principles of Information Security. It does an excellent job of presenting material for both audiences.

If you have other vendors you would like to see on this list, send me a message …