[Open Source] A list of useful Python Open Source Projects

Tornado is a Python web framework and asynchronous networking library
http://www.tornadoweb.org/en/stable/

a powerful interactive packet manipulation program
http://www.secdev.org/projects/scapy/

[NSX] Network Visualization Gets Physical

In VMware NSX, how to let network visualization gets physical?
The answer is "Layer 2 Gateway Services". The physical switches have to implement the OVSDB and related APIs that communicate with NSX Controller so that they can provide the mapping of the segment in virtual network and VLAN in physical network. For more information in details, you can check out the following URLs.

http://networkheresy.com/2013/08/15/network-virtualization-gets-physical/


https://www.youtube.com/watch?v=QDOlggwyrVA&feature=c4-overview-vl&list=PLdYldEmmLm2lz5Bd0bzGCDKSULL52ytJT

Ivan's NSX Architecture Introduction, it is very good.
http://demo.ipspace.net/get/NSXArch

[OpenVNet] The introduction of OpenVNet

Why I pay attention to OpenVNet is because it uses Trema-Edge as OpenFlow 1.3 Controller to communicate with Open vSwitch 1.10. It gives us a great example to use Trema-Edge in Virtual Network Environment and learn more about some use cases. Please check out the following lists:

What is OpenVNet?
http://www.slideshare.net/akirayokokawa/openvnet

Offical Web Site:
http://openvnet.com/

Github Source:
https://github.com/axsh/openvnet

[Quagga] How to compile and install Quagga on Ubuntu 12.04

The following steps are the compilation and installation for Quagga on Ubuntu 12.04. Hopefully it is helpful for you.

• Install all dependency(package) 
• sudo apt-get build-dep quagga
• Give the path for all configurations files and libraries used by quagga for starting. I use this one /opt/quagga .... and this is done by this comand: 
• ./configure --enable-vtysh --prefix=/opt/quagga --localstatedir=/opt/quagga sysconfdir=/opt/quagga 
• Create new folder: 
• sudo mkdir /opt/quagga
• Add new user : 
• sudo adduser quagga 
• Give the priviledge for the user quagga over the folder: /opt/quagga and for the folders and subfolders you give the privilegde for all rights : reading, changing and executing
• sudo chown quagga:quagga /opt/quagga
• sudo chmod 777 /opt/quagga 
• Then you will be able to comiple Quagga: 
• make
• sudo make install 

Quagga configuration
--------------------
quagga version          : 0.99.22
host operating system   : linux-gnu
source code location    : .
compiler                : gcc
compiler flags          : -Os -fno-omit-frame-pointer -g -std=gnu99 -Wall -Wsign-compare -Wpointer-arith -Wbad-function-cast -Wwrite-strings -Wmissing-prototypes -Wmissing-declarations -Wchar-subscripts -Wcast-qual
make                    : make
includes                : 
linker flags            :  -lcrypt   -lrt -lcap  -lm
state file directory    : /opt/quagga
config file directory   : /opt/quagga
example directory       : /opt/quagga
user to run as  : quagga
group to run as  : quagga
group for vty sockets : 
config file mask        : 0600
log file mask           : 0600

Now, let us try Quagga for some examples

• Zebra
• Copy sample to conf file:
• cd /opt/quagga
• cp zebra.conf.sample zebra.conf
• Start zebra daemon, you use this command 
• sudo /opt/quagga/sbin/zebra &
• Check the daemon zebra:
• netstat -a | grep zebra 
• Get into the zebra, you use 
• telnet localhost zebra
• BGP
• Copy sample to conf file:
• cd /opt/quagga
• cp bgpd.conf.sample bgpd.conf
• Start bgpd: 
• sudo /opt/quagga/sbin/bgpd &
• Check the daemon zebra:
• netstat -a | grep bgpd
• Get into the bgpd, you use 
• telnet localhost bgpd
• vtysh
• cd /opt/quagga
• vi /opt/quagga/vtysh.conf
• sudo /opt/quagga/bin/vtysh

! Sample configuration file for vtysh.
!
!service integrated-vtysh-config
hostname quagga-router
username root nopassword
!

Stop Quagga Daemon ( for example: bgpd ):

• sudo kill `cat /opt/quagga/bgpd.pid`

Port Number:

• zebra: 2601
• ripd:  2602
• ripng: 2603
• ospfd: 2604
• bgpd:  2605
• ospf6d: 2606

Reference:
http://openmaniak.com/quagga_tutorial.php

http://wiki.nil.com/Installing_and_running_Quagga#Initial_configuratiom

http://sourceforge.net/apps/mediawiki/quagga/index.php?title=TipsNTricks

[EVB] What is EVB?

The introduction of EVB
http://networkerhere.blogspot.tw/2012/11/impact-of-server-virtualization-on_13.html
http://blog.ipspace.net/2011/05/edge-virtual-bridging-evb-8021qbg-eases.html

Due to overlay network, EVB is becoming to die ...!? The most main reason is that VLAN is not able to scale:
http://blog.ipspace.net/2012/02/edge-virtual-bridging-8021qbg.html

There are also some similar approaches, such as, VN-Tags that can do the same thing as EVB.
http://www.definethecloud.net/access-layer-network-virtualization-vn-tag-and-vepa/

[Puppet] The studying track of Puppet

After taking some time to study Puppet a while, I become to believe more and more that it is a great auto configuration tool. The following URLs are my studying track of Puppet.

For the beginner, it is recommended to walk through for learning the basic concept
Learning Puppet
http://docs.puppetlabs.com/learning/index.html

Once you finish the above document, you probably want to do your own type and provider. Here you go:
Customer Type
http://docs.puppetlabs.com/guides/custom_types.html
Provider Development
http://docs.puppetlabs.com/guides/provider_development.html

Juniper provides its open source project for using Puppet to manage and configure the switches that support Puppet Agent. It is a very good example for you to understand how to define customer type and to implement provider.

To define customer type:
https://github.com/NetdevOps/puppet-netdev-stdlib
To implement provider:
https://github.com/Juniper/puppet-netdev-stdlib-junos

[OpenFlow 1.X] The Flow Table Usage

When OpenFlow 1.0 guys try to reach the version 1.1 or more, the first question coming up with would most likely be "how to use multi-flow tables ?" Well, we could see an example in RYU OpenFlow Controller as follow: http://www.slideshare.net/yamahata/ryu-sdnframeworkupload
In page 33, there are 3 flow tables which contains match conditons and actions. It can give an initial idea for that question.






P.S: Pica8 works with Broadcom to double flow table size in its OF1.3 Switch
http://searchsdn.techtarget.com/news/2240214709/Pica8-doubles-flow-rule-capacity-in-its-new-OpenFlow-13-switch