Categories
Networking Open Source Utilities Wireless

Finding a Wireless Signal (inSSIDer)

A friend of mine, was recently having some trouble finding a wireless signal at an airport, and asked what tools were available for his Vista laptop.

Since he travels frequently, I suggested that the next time he had real Ethernet connection to download NetStumbler, to help him locate wireless Access Points (APs).

He did, but was unable to get it to work on his Vista machine.

At the time, NetStumbler had always enjoyed a good reputation for be a great free utility, and a ‘Must have application’ for any techies involved with wireless networking, so I was a little surprised to hear there were issues.

Wanting to help my friend out, and felling bad about giving him a poor recommendation, I did some searching, and found MetaGeek’s inSSIDer.

inSSIDer is a free Open Source software utility, that also supports an array of additional paid products that could be an inexpensive alternative to commercial products such as Fluke Networks’ AirMagnet.

After inSSIDer installed and launched, the first thing that one notices, especially coming from NetStumbler environment, is that the graphs are in color, which is invaluable when trying to figure out multiple sources of signals.

This is not to say that color is the best part of inSSIDer, but it also uses the native Wi-Fi API to group ‘clients’ by MAC Address, SSID, Channel, RSSI as well as “Time Last Seen”. Since inSSIDer also supports GPS devices, this can very extremely valuable when mapping a wireless network environment.

Bottom line –

If you are looking for a very useful wireless network discovery tool that is free, then I would suggest that you look no further then inSSIDer.

inSSIDer was also the 2008 winner of InfoWorld’s “Best of Open Source“.

[contentblock id=1]

Categories
Gadgets Networking Reviews Web

Pogoplug – Easy File Sharing

I first read about this in the current (12/7) issue of Networkworld.com

Pogoplug: A wolf in sheep’s clothing

It is a very interesting idea for a home User, but as the article points out, one would NOT want to have something like this in a Corporate environment!

Need to do some more reading, and budget some money…

Let me know what you think.

– Andrew
§ § § § §
[adrotate banner=”1″]
Categories
Information Networking

OpenDNS and Comcast DHCP/DNS issues

Couple of weeks ago, I got knocked off the internet, and it took me awhile to figure out what when wrong.

Background
I’m working with a new client and their application requires a high speed network to do what they want to do. So I finally had an excuse to purchase 1GB network equipment upgrade: a Network switch and a Network NIC.

I installed the switch and NIC without issue, and proceeded to “clean out” my Server.

I literally pulled all cables and took the machine out to the garage and used an air compressor to dust the beast out.

After the major dusting, in which clouds of dust escaped from the open garage, I also removed several unused PCI cards, and finally put things back together, and got the internal network running, but could not connect to the internet.

Issues
I could connect to all my internal machines, but I could not connect from any machine out via Name.

Oddly, I could “ping” outside servers by IP address, but could not by Name, even when directly connected to the cable modem.

A couple of times, after hard resetting the cable modem and firewall/router, there would be access for a while, or be deathly slow.

Resolution
I had to shut down shutdown the network, except for the main server.

Opened DNS manager and cleared any and all DNS caches, along with stopping and starting the server, and a reboot or two for good measure.

Then directly connected the main server to the “cable modem” via wired ethernet.

I changed the Server’s static IP address to be on the same sub-net as the cable modem (192.168.100.1).

Connect to OpenDNS, and delete the old IP information, and setup new IP information.

Reconfig the server back to it’s original IP range, connect firewall/router to modem, and reconnect to OpenDNS.

Finds

I went through all my settings, machine by machine, flushed caches, renewed IP, reset WinSock, etc.

  • Comcast has 1 hour DHCP address renewal
    • Seems that when I had my server down for cleaning, it missed a DHCP “conversation” and my external IP changed.
  • OpenDNS
    • Was using my Old IP address and for some reason would not resolve IPs to Name.

Lessons Learned
Since I originally ran into this issue, it has happen one more time, but I immediately connected the server to the cable modem, reestablished OpenDNS connectivity, and moved ethernet cables back. (Estimated time: 10 minutes vs. Hours of Troubleshooting)

I have also downloaded and installed the OpenDNS agent, and is running all the time.

– Andrew
§ § § § §
[adrotate banner=”1″]
Categories
Gadgets Networking Reference Utilities

OnLine IP4 to IP6 conversion

Here is a link to an Online IP4 to IP6 conversion utility.

<http://ip-lookup.net/conversion.php>

Happy Ping-ing!

– Andrew
§ § § § §
[adrotate banner=”1″]