Open or not open, that is the stupid question.

$ sudo apt-get remove sudo apt-get remove openjdk-6-jdk icedtea-6-plugin $ sudo apt-get install openjdk-7-jdk icedtea-7-plugin $ sudo apt-get install openjdk-7-jre:i386 $ sudo apt-get install libstdc++6:i386 lib32z1 lib32ncurses5 lib32bz2-1.0 libxext6:i386 libxrender1:i386 libxtst6:i386 libxi6:i386 Wish this helps. regards, Stanley Huang

In my company, I need to test it when I build a new image. Therefore I have to setup my testing environment for integration test. I wrote a script to automatically setup the environment from new install Ubuntu. The steps are: 1. Download and setup tftp server. 2. Download and setup dhcp server with netboot option. 3. Install virtualbox. After that you could create a VM then choose netboot. (the first interface must connect to tap0 to get boot server information) #!/bin/bash ######## utilities ######## _getTasks() { indent="$1" cat $0 | grep '()' | grep -v "^_" | grep "^[^ ]" | cut -d'(' -f1 | sed -e "s/^/$indent/" } _showUsage() { indent=" " cat <<EOF Usage: $0 task Ex. $0 `_getTasks | head -1` tasks: ${indent}[ all ] `_getTasks "$indent"` EOF } _die() { echo "$1" exit ${2:-1} } _checkID() { uid=`id | cut -d'(' -f1 | cut -d'=' -f2` [ $uid -ne ...

If you want to use the concept "connection pool" for ssh, you could try the following sample. #!/bin/bash # # You might need to modify sshd_config with the following attributes: # # MaxStartup 200 # MaxSessions 200 # [ "$1" == "-d" ] && set -vx && shift control_master="$1" && [ "$control_master" != "false" ] && control_master=true username="$2" && [ -z $username ] && username=stanley remote_host="$3" && [ -z $remote_host ] && remote_host=127.0.0.1 cmd1="$4"&& [ -z $cmd1 ] && cmd1=ls control_master_option="" client_cmd="/tmp/a.sh" buildControlMaster() { if $control_master then ssh -N -o "ControlMaster auto" -o "ControlPath ~/.ssh/master-$username@$remote_host" $username@$remote_host & fi } createClientCmd() { mkdir -p /tmp/add rm /tmp/add/* $client_cmd if $c...

Memo it: 1. openWNS: www.openwns.org/Wiki 2. ns-3: www.nsnam.org , ns-3 provides python API to use. Wish this helps. regards, Stanley Huang

A good sample to demo how to setup Juniper VPN in Ubuntu 64 bit environment. http://wireless.siu.edu/install-ubuntu-64.htm Wish this helps. regards, Stanley Huang

How to enable VNC server in Ubuntu 10.04, please refer here . Wish this helps. regards, Stanley Huang

If you need to setup the vpn on Ubuntu, you could refer to the following 2 links: http://mad-scientist.us/juniper.html http://holyarmy.org/2009/06/vpn-on-ubuntu-linux-with-juniper-network-connect/ Wish this helps. regards, Stanley Huang

The bonding info of Linux, click here for more detail. Wish this helps. regards, Stanley Huang

Install telnetd in Ubuntu 10.04: # sudo su # apt-get install openbsd-inetd # echo "telnet stream tcp nowait root /usr/sbin/tcpd /usr/sbin/in.telnetd" >> /etc/inetd.conf # /etc/init.d/openbsd-inetd restart Wish this helps. regards, Stanley Huang

$ sudo apt-get -y install python-netaddr ... $ cd /usr/share/pyshared/netaddr/eui $ sudo python ./ieee.py downloading latest copy of http://standards.ieee.org/regauth/oui/oui.txt downloading latest copy of http://standards.ieee.org/regauth/oui/iab.txt $ python >>> from netaddr import * >>> mac = EUI('bc:ae:c5:3b:fc:5e') >>> print mac.oui.registration().org ASUSTek COMPUTER INC. Wish this helps. regards, Stanley Huang

Once you upgrade Ubuntu from 10.04 to 11.04, and you will find out the network-manager won't manage wireless any more. But you still could change NetworkManager.conf to enable it. # sudo vi /etc/NetworkManager/NetworkManager.conf and change "managed" attribute from "false" to “true“ and restart it. # sudo /etc/init.d/network-manager restart Wish this helps. regards, Stanley Huang

How to connect wireless ap by command in Ubuntu? You can use two commands, 'iwlist', 'iwconfig'. # iwlist --help Usage: iwlist [interface] scanning [essid NNN] [last] [interface] frequency [interface] channel [interface] bitrate [interface] rate [interface] encryption [interface] keys [interface] power [interface] txpower [interface] retry [interface] ap [interface] accesspoints [interface] peers [interface] event [interface] auth [interface] wpakeys [interface] genie [interface] modulation # iwlist wlan0 scanning essid ap_name # iwconfig --help Usage: iwconfig [interface] interface essid {NNN|any|on|off} interface mode {managed|ad-hoc|master|...} interface freq N.NNN[k|...

install gui tool for ufw # apt-get -y install gufw # gufw use command(ufw) to setting firewall, and the config file in in /lib/ufw/user.rules # ufw deny from any to any port 22 # ls -al /lib/ufw/user.rules -rw-r----- 1 root root 1405 2011-04-01 17:36 /lib/ufw/user.rules # ufw delete deny from any to any port 22 # ls -al /lib/ufw/user.rules -rw-r----- 1 root root 1263 2011-04-01 17:36 /lib/ufw/user.rules my setting history (reference only): ufw disable ufw default deny ufw logging ON ufw enable ufw allow 22/tcp ufw allow proto tcp from 192.168.1.0/24 to 192.168.1.101 port 80 use iptables command: #!/bin/bash MY_IP=192.168.100.101 # Flushing all rules and chains iptables -F iptables -X # Setting default policy iptables -P INPUT DROP iptables -P OUTPUT ACCEPT iptables -P FORWARD DROP # Allow traffic on loopback iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ACCEPT # Allow ssh for in/out iptables -A INPUT -p tcp -s 0/0 -d $MY_IP --sport 513:65535 --dport 22 -m state...

I wrote a python script to get broadcast by giving ip and netmask. And I use "lambda" and "map" function to shorten my code, so it's also a good sample for you to study map function. More information please refer here . The sample code is as the following: #!/bin/env python def getBroadcast(self, ip=None, netmask=None): if not ip or not netmask: return None ip = ip.split('.') netmask = netmask.split('.') for n in range(0,4): if netmask[n] == '0': break bc = (map(lambda a, b: str(int(a, 10)&int(b,10)), ip[0:n]+['255']*(4-n), netmask[0:n]+['255']*(4-n))) if n > 1: bc[n-1] = str(int(bc[n-1]) + (255 - int(netmask[n-1]))) return '.'.join(bc) print getBroadcast('192.168.10.1','255.255.254.0') Result: 192.168.11.255 Wish this helps. regards, Stanley Huang

#!/bin/env python def getEtherList(): return [x.strip() for x in \ os.popen("ifconfig -a | \ grep Link | grep '^[^ ]' | \ grep -v lo | awk '{print($1)}'")\ .readlines()] print getEtherList() Wish this helps. regards, Stanley Huang

Sometimes, you want to transfer between netmask and prefix setting. You can use the following sample script which is written by Python. #!/bin/env python def transferPrefix2Netmask(self, prefix): netmask = '' nLeadingFF = prefix / 8 netmask += '.'.join(['255']*nLeadingFF) if nLeadingFF != 4: netmask += '.' + str(256-2**(8-prefix%8)) nSuffix00 = 3 - nLeadingFF if nLeadingFF < 3: netmask += '.' + '.'.join(['00']*nSuffix00) return netmask def transferNetmask2Prefix(self, netmask): prefix = 0 left = 0 for i in netmask.split('.'): if i == '255': prefix += 8 else: left = int(i) break if left != 0: for n in range(7, 0, -1): prefix += 1 if left - 2 ** n == 0: break ...

If you want to reset the seq. no of interface. You can remove the record in /etc/udev/rules.d/70-persistent-net.rules. Wish this helps. regards, Stanley Huang

One networking library for python called 'Scapy', is worth for you to try. http://www.secdev.org/projects/scapy/index.html Wish this helps. regards, Stanley Huang

How to setup your wireless interface to auto connect to ap in Ubuntu? You can set the config in /etc/network/interface like below: wlan0 auto iface wlan0 inet dhcp wireless-essid your_essid wireless-key your_essid_passphrase wireless-channel your_essid_channel Wish this helps. regards, Stanley Huang

If you want to detect port, you can use socket module to do it. #!/bin/env python import os, sys import socket def detectPort(PORT):     # Echo server program     import socket     HOST = ''     s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)     try:         s.bind((HOST, PORT))         return_code=1     except:         return_code=0     s.close()     return return_code if __name__ == '__main__':   for PORT in [80,81,82,8000,8080,3306,3307]:     if detectPort(PORT): print PORT Wish this helps. regards, Stanley Huang