slmingol posted this in
tips & tricks on
August 15th, 2009, @ 2:02 amHere’s a little trick that I learned how to do the other day while at work. I’ve done this before using ssh in a linux terminal but hadn’t had the chance to actually do it from a windows box using PuTTY.
Objective
To access a web server (on a remote linux box) which is listening on port 80 through an ssh connection. We want to access the web server through port 10001 on the localhost. This can be accomplished by mapping localhost’s port 10001 to port 80 on the remote host.
Here’s a diagram that attempts to represent what’s going on with the ports, the hosts, and the ssh connection.
ports diagram
Setup
In this scenario we have 2 hosts, the local host (i.e. localhost) and the remote host (homer). Running PuTTY on the localhost, we specify that we want to login to homer as a user on that system, i.e. root, for example. It doesn’t have to be root, this just happens to be the user that I’m using in this example.
putty dialog #1
Next in the PuTTY Configuration dialog box, expand the category SSH, and select the category Tunnels. In Tunnels’ configuration, specify the Source port, 10001, and the Destination, homer:80. Then click the Add button.
putty dialog #2
…. Continue reading → [one-liner]: Port Forwarding Using PuTTY »»
slmingol posted this in
tutorials on
July 22nd, 2009, @ 11:24 pm
Description
I recently came across this handy ncurses-based tool called wavemon for monitoring the status of both the wireless networks around my laptop as well as my wireless card. It offers most of the features that you’d find in any equivalent GUI. The impressive thing here is that all these features are made available in a terminal window.
Here’s a quick run down of features:
- overview screen, displaying all important information like device configuration, encryption and power management parameters and network information at once
- adaptive level bargraphs for link quality, signal/noise strength and signal-to-noise ratio
- customizeable “level alarm” feature that notices the user of changes in signal level strength audibly and/or visually
- full-screen level histogram displaying signal/noise levels and SNR
- list of access points in range
- menu-based configuration from within the program
Installation
On my Fedora 10 box wavemon was available from the standard repository. So installation was a snap.
Usage
To run wavemon, simply type wavemon in your terminal.
Screenshots
wavemon Info Tab
wavemon Level Histogram
I tend to spend a lot of time in terminal windows so I’m always glad when I find yet another ncurses-based app that gives me the same feature offerings as a heavier GUI.
slmingol posted this in
tutorials on
February 21st, 2009, @ 4:44 am
Description
I recently found out about this tool from a buddy of mine at work. It’s miles more useful than just a vanilla traceroute. It’s great for diagnosing a route between yourself and another computer that is either slow or overloaded. It is a curses based app that runs very nicely in a console or shell.
Example #1
Trace all the routes between myself and www.google.com
screenshot #1 of mtr
…. Continue reading → mtr – A Network Diagnostic Tool »»
August 15th, 2009, @ 2:02 am |
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