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Posted on in Networking
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 …
Posted on in Software
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 …
Posted on in Software
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 …
Posted on in System Administration
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 …
Posted on in voice
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 …
Posted on in Networking
Records a single observed IPv4 packet-size average without enough traffic context to guide capacity planning or network analysis.
Posted on in voice
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 is by far the most popular protocol used in VoIP communication today. SIP was designed as a …
Posted on in System Administration
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 …
Posted on in Software
Somehow, I have let my Gmail inbox get totally out of control. I don't know if it was the holidays or what, but as of this morning, I had over 800 unread messages in my Gmail inbox. I decided a little while ago that it was time to focus on …
Posted on in Software
Importing Mozilla Firefox bookmarks into Safari on your Mac is really easy. Firefox stores its bookmarks in an HTML file that can be parsed by Safari. In Safari, simply click on the File menu and select Import Bookmarks. This will open a file selection dialog box. Firefox stores its bookmarks …
Posted on in System Administration
Previously, I mentioned that I was unable to remove the FAX= portion of the string produced by Cisco's $s$ (or $d$) macro in a T.37 store and forward fax configuration. That's still the case. I have found no way of doing this inside IOS. If it's possible, I've …
Posted on in Programming
If you get this error when trying to save something in the Django admin, it's probably because you forgot to synchronize the database after adding the admin application. If you are using a pre-1.2 version of Django, you can simply:
$ ./managy.py syncdb
Django 1.2 (which is currently …
Posted on in Software
Former Lotus Notes users may prefer to see unread messages in red rather than just bold. Microsoft Outlook uses two different views to display message lists to the user: Messages and Messages with AutoPreview. We will need to change the font color to red in both views to ensure that …
Posted on in voice
For about a month, I've had a problem with my Contacts app crashing on my T-Mobile G1. Whenever this would happen, I would be forced to close the Contacts application. This was a pretty major pain in the butt since I tend to use the Contacts and Favorites tab to …
Posted on in System Administration
I use screen for various purposes. It's nice to be able to sit down at a different terminal and attach to my same session, for example. I also occasionally run some long-term commands that will blow up if my session is disconnected. The one thing I need to do with …
