Free Command

Display free memory size in MB:
$ free -m

Output:

total       used       free     shared    buffers     cached
Mem:              1975       1555        419          0         62        861
-/+ buffers/cache:        632       1343
Swap:               0              0            0

Displays a line containing the totals memory in MB:

$ free -t -m

Output:

total       used       free     shared    buffers     cached
Mem:                 1975       1535        439          0         62        855
-/+ buffers/cache:        617       1357
Swap:                      0          0          0
Total:                  1975       1535        439

The vmstat command reports information about processes, memory, paging, block IO, traps, and cpu activity.

vmstat Command

Type vmstat command at shell prompt:

$ vmstat
Output:

procs ———–memory———- —swap– —–io—- -system– —-cpu—-
r  b      swpd   free         buff        cache        si   so    bi    bo   in   cs     us sy  id  wa
1  1      0          446524  63732    876068    0    0    21    28  955  465 17  4  78  1

top command

Type top command at the shell prompt:
$ top

Sample outputs:
Fig.01: top command displaying used memory

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A VLAN has the same attributes as a physical LAN, but it allows for end stations to be grouped together even if they are not located on the same LAN segment. Network reconfiguration can be done through software instead of physically relocating devices.FreeBSD VLANs Configuration using ifconfig Command
To create a new VLAN interface, enter:

# ifconfig {vlan-name} create

To associate the VLAN interface with a physical interface and assign a VLAN ID, IP address, and netmask:

# ifconfig {vlan-name} {ip-address} netmask {subnet-mask} vlan {vlan-id} vlandev {physical-interface}

The following examples, all packets will be marked on egress with 802.1Q VLAN tags, specifying a VLAN ID of 5:

# ifconfig vlan5 10.0.0.1 netmask 255.255.255.0 vlan 5 vlandev em0

To remove a VLAN interface, enter:

# ifconfig {vlan-name} destroy

Persistence VLAN Configuration

To make configuration persistence, open /etc/rc.conf:

# vi /etc/rc.conf

Append / modify as follows:

cloned_interfaces=”vlan0″
ifconfig_vlan0=”inet x.x.x.x netmask y.y.y.y vlan 2 vlandev em0″

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An IP address is the numerical address for devices on the internet (such as computers or smartphones) that allow them to communicate. The concept is similar to the telephone number for your landline phone using POTS (plain old telephone service). IPv4 uses a 32 bit address, which allows 2 to the 32 , or about 4.2 billion addresses. IPv6 uses a 128 bit address, which allows 2 to the 128, or about 340 undecillion addresses. That’s 3 followed by 38 zeros. It also has other features not contained in IPv4.

One of the challenges is that IPv4 and IPv6 are not interoperable, thus requiring dual protocol techniques to be used so long as IPv4 addresses continue to be used. An IPv4 address looks like this: 192.168.0.1 . An IPv6 address looks like this: 2607:F798:0010:0114:0000:0672:3121:0171 .

In addition to getting over an address shortage for conventional use, it provides enough addresses for the internet of things, where, for example, your house and everything in it (appliances, furnace, lights, …) can each have its own unique address.

Read More : www.wired.com

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Below are some of BBSSH’s key features,

• Secure – uses BlackBerry’s native encryption for the best performance, battery life, and proven BlackBerry security.
• Flexible – support for the “linux” pseudo-terminal, as well as ansi, vt100, vt220, and vt320 emulation over Telnet and SSH; an extended onscreen keypad allows you to send special keys while basic keys like CTRL and ALT are available from your keyboard/touchscreen without using buttons or menus.
  Powerful – a macro editor gives you the tools to make complex tasks simple; and simple tasks are just a keypress away by default.
• Multitasking – run multiple sessions concurrently and in the background; switch between active sessions with a keypress.
• Efficient – in an area with a string network signal (or on WiFi), a light-usage SSH session can run all day without significantly affecting your battery life.
• Flexible – fully configurable – up to and including changing font face and size on the fly.
• Affordable – while we appreciate donations and purchases through AppWorld (coming soon), BBSSH is available free of charge through this web site.
• Integrated – BBSSH takes full advantage of the available BlackBerry integration features

Uses BlackBerry notification profiles (including vibration, LED, and ringtones) and home screen notification icons to inform you of critical events.

If you have OS6, BBSSH will make use of the latest OS6 features such as home screen shortcuts– allowing you to connect to or resume sessions directly from your home screen.

Full touchscreen support including correctly changing remote terminal size when you re-orient (and the ability to prevent terminal reorientation).

from 50 to 220 custom shortcuts available based on your phone model — allowing you to perform actions ranging to sending a special keystroke to running a complex multi-step macro with just just one or two keypresses or touches.

To download BBSSH from your BlackBerry device, visit this location from your native BlackBerry browser:

http://bbssh.org/ota/

If you have difficulties with installing directly on your BlackBerry, you may instead download the desktop installation files from the location below, and install from BlackBerry Desktop Manager.

http://bbssh.org/ota/choose.html

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To allow complete simulations, GNS3 is strongly linked with :

* Dynamips, the core program that allows Cisco IOS emulation.
* Dynagen, a text-based front-end for Dynamips.
* Qemu, a generic and open source machine emulator and virtualizer.

This project is an open source, free program that may be used on multiple operating systems, including Windows, Linux, and MacOS X. But I will only share how to install GNS3 on Ubuntu :

1. First we will install Dynagen and Python-Qt4

sudo apt-get install dynagen python-qt4

2. Download GNS3 and extract in /opt

cd /opt
sudo wget http://space.dl.sourceforge.net/project … rc.tar.bz2
sudo tar -xjvf GNS3-0.7.2-src.tar.bz2 && rm GNS3-0.7.2-src.tar.bz2
sudo mv GNS3-0.7.2-src /opt/GNS3

3. Create the following directories:
These directories will be used by GNS3 – such as projects – where your working projects will be stored, cache, temp, IOS images, etc.

cd /opt/GNS3
sudo mkdir Dynamips
sudo mkdir IOS
sudo mkdir Project
sudo mkdir Cache
sudo mkdir tmp
sudo chmod o+rw -R ./Project
sudo chmod o+rw -R ./tmp
sudo chmod o+rw -R ./IOS

4. Download binary of dynamips and make it executable

cd Dynamips
sudo wget http://www.ipflow.utc.fr/dynamips/dynam … C2-x86.bin
sudo chmod +x ./dynamips-0.2.8-RC2-x86.bin

You can create a desktop shortcut by right-clicking on the desktop and select “Create Launcher..”, Name it GNS3 and in the command section type in

python “/opt/GNS3/gns3″

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1. Download package

Download the package sqstat from samm.kiev.ua.

2. Extract Packs

# Gunzip-1.20.tar.gz sqstat
# Tar-xvf sqstat-1.20.tar

3. Move Folder to a webserver

Sqstat-1:20 # mv /var/www/html/: cd/var/www/html

4. Changing Names

# mv sqstat-1.20 sqstat

5. Configuration sqstat

# Cd sqstat
# Cp config.inc.php config.inc.php.defaults
# Vi config.inc.php

In the config.inc.php file, change the IP address & port of squid to the IP Address & port squid ours. For example, as an example:

/* Squid proxy server ip address or host name */
$squidhost[0]=”192.168.0.250″; /* Squid proxy server port */
$squidport[0]=3128;

After that we will change the file squid.conf

# vi /etc/squid/squid.conf

In the file, add the following script:

acl manager proto cache_object
acl webserver src 192.168.0.250/255.255.255.255
http_access allow manager webserver
http_access deny manager

6. Restart Webserver

# service httpd restart

7. Test sqstat
Open the browser and then type:

http://ip_address/sqstat

Then there will be display as follows:

Change Auto refresh from a value of 0 to 5 for this application can be refreshed every 5 seconds and press the Update button.

6. Troubleshooting
Generally what happens is an error during testing sqstat in a browser that is no error statement:

SqStat error
Error (1): Cannot get data. Server answered: HTTP/1.0 403 Forbidden

This may happen because we are wrong to place the script: http_access deny manager in squid.conf file. Put the script at the bottom section on the item http_access.

If no display image as above, but just a list it in your browser, then type:

# mv sqstat.php index.php

Source : www.catatanlepas.com

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