Installing GNS3 on CentOS 6.x/RHEL 6.x/Fedora 15

1. Login as root then do the following steps:
   yum install python python-devel xorg-x11-proto-devel libXext-devel gcc-c++ libXrender*


2. Download and install Qt
   #wget http://get.qt.nokia.com/qt/source/qt-everywhere-opensource-src-4.7.4.tar.gz
   #tar -xzf qt-everywhere-opensource-src-4.7.4.tar.gz
   #cd qt-everywhere-opensource-src-4.7.4
   #./configure -nomake examples -nomake demos -qt-gif -no-exceptions -debug -qt3support
   #gmake
   #gmake install
   #PATH=/usr/local/Trolltech/Qt-4.7.4/bin:$PATH
   #export PATH


3. Download and install sip
   #wget http://www.riverbankcomputing.co.uk/static/Downloads/sip4/sip-4.13.tar.gz
   #tar -xvf sip-4.13.tar.gz
   #cd sip-4.13.tar
   #python configure.py
   #make
   #make install


4. Download and install PyQt
   #wget http://ftp.pardus.org.tr/pub/source/2009/PyQt-x11-gpl-4.8.4.tar.gz
   #tar xvf PyQt-x11-gpl-4.8.4.tar.gz
   #cd PyQt-x11-gpl-4.8.4
   #python configure.py -q /usr/local/Trolltech/Qt-4.7.4/bin/qmake
   #make
   #make install


5. Download GNS3
   #wget http://downloads.sourceforge.net/project/gns-3/GNS3/0.7.4/GNS3-0.7.4-src.tar.gz
   #tar -xvf GNS3*.tar.gz && rm GNS3*.tar.gz
   #cd GNS3-0.7.4-src
   #mkdir Dynamips IOS Project Cache Temp


6. Download Dynamips depending up on OS (64-bit/32-bit)
   #cd dynamips
   #wget http://downloads.sourceforge.net/gns-3/dynamips-0.2.8-RC2-amd64.bin?download (for 64-bit OS)
   #wget http://downloads.sourceforge.net/gns-3/dynamips-0.2.8-RC3-community-x86.bin?download (for 32-bit OS)
   #chmod +x dynamips-0.2.8-RC2-amd64.bin (if we use 32-bit version, use the name of that file)


7. Creating Quick launch with gns3 icon
   #wget http://www.noahbeach.com/wp-content/uploads/2011/08/gns3.png
   Now right click on the panel and select add to panel > custom launcher > select the gns3 location and press on the icon button to locate the icon just downloaded. ok
   Now if we press that icon in the panel, gns3 will run...!!!

Preparing a bootable RHEL6 Bootable Pen drive

1. Go to images sub directory of RHEL DVD
2. If the location of the pen drive is /dev/sdd, write the image to pen drive using the following command:

#dd if=efidisk.img of=/dev/sdd

Note: This command will overwrite all existing data on the drive

Configuring router for SDM

SDM configuration steps:

1. Create user accounts
2. Enable http and/or https server
3. Configure http to use local user database

R1(config)#username binoy privilege 15 secret cisco
R1(config)#ip http server
R1(config)#ip http secure-server (allows encrypted access)
R1(config)#ip http authentication local

Now download SDM from www.cisco.com/go/sdm and install it in the computer (requires java runtime environment) and launch the SDM by giving IP address in SDM launcher

Cisco router password recovery process

1. Connect to console port
2. Use the power switch to power cycle the router.
3. Issue the break sequence within 60 seconds of power up to put the router into ROMmon.
4. Type “confreg 0x2142” at the rommon 1> prompt.  (This changes the default configuration register and causes the router to bypass the startup configuration where the forgotten enable password is stored.The configuration register is usually set to 0x2102 or 0x102)
5. Type no after each setup question, or press Ctrl-C to skip the initial setup procedure.
6. Router> enable
7. Router#copy start run
8. Now, change the passwords and give no shutdown commands to interfaces
9. R1(config)# config-register 0x2102 (To make the startup configuration effective while next booting)

Administrative Distance of Routing protocols

Connected interface	0
Static route	1
Enhanced Interior Gateway Routing Protocol (EIGRP) summary route	5
External Border Gateway Protocol (BGP)	20
Internal EIGRP	90
IGRP	100
OSPF	110
Intermediate System-to-Intermediate System (IS-IS)	115
Routing Information Protocol (RIP)	120
Exterior Gateway Protocol (EGP)	140
On Demand Routing (ODR)	160
External EIGRP	170
Internal BGP	200
unknown	255