Cisco CAT4 or CAT6 router IOS update

Steps:

1) Power up Cat4506E as normal
2) (ip add management int vlan1) Use tftp method to copy the image into bootflash:
3) Issue command config-register 0x2102 (the switch default register is 0x2101, it means the switch will always auto-boot from 1st available file inside bootflash: which is normally the old image)
(define which image that you want to boot it from)
4) Issue command boot system flash bootflash:cat4500-entservices-mz.122-46.SG.bin
5) Save config and reload switch; make sure the switch is able to boot with the new image (show version)
6) Issue command config-register 0x2101
7) Delete old image from bootflash: (delete bootflash:)
8) Free up space for bootflash: (squeeze bootflash: )
9) Issue command no boot system flash bootflash:cat4500-entservices-mz.122-46.SG.bin
10) Save config and reload again

Upgrading/recovering Cisco router IOS using a laptop compact flash reader

if you want faster loading ios to CF card? and if you don't have tftp server, console cable, console port etc..

you can copy ios to CF card directly from laptop card reader.
then just put it back to router and reboot it.

check dir or show version after booted.

Cisco ASA bypass and play around

You can play new configuration without touching existing configurations.



#asdm image flash:/asdm-602.bin
#http server enable
pixfirewall(config)# http 192.168.10.0 255.255.255.0 inside


***if you want to play with already configured ASA. You don't need to touch inside configuration..

Boot ASA
Presss ESC ...at boot
rommon #1> confreg

Use ? for help.
rommon #0> confreg

Current Configuration Register: 0x00000001
Configuration Summary:
boot default image from Flash

Do you wish to change this configuration? y/n [n]: y <----
enable boot to ROMMON prompt? y/n [n]: n
enable TFTP netboot? y/n [n]: n
enable Flash boot? y/n [n]: n
select specific Flash image index? y/n [n]: n
disable system configuration? y/n [n]: y
go to ROMMON prompt if netboot fails? y/n [n]: n
enable passing NVRAM file specs in auto-boot mode? y/n [n]: n
disable display of BREAK or ESC key prompt during auto-boot? y/n [n]: n

Current Configuration Register: 0x00000040
Configuration Summary:
boot ROMMON
ignore system configuration

Update Config Register (0x40) in NVRAM...

rommon #1> en
Invalid or incorrect command. Use 'help' for help.
rommon #0>
rommon #0>
rommon #0> boot
Launching BootLoader...
Default configuration file contains 1 entry.

Searching / for images to boot.

Loading /asa802-k8.bin... Booting...


You can play whatever you want ...........................

if you play enoguht
ciscoasa(config)# config-register 0x1
ciscoasa#reboot

Don't save or don't write mem

Cisco Routers and Switches telnet and console login enable

username xtra privilege 15 secret cisco@admin
username customer privilege 15 secret cisco@customer

line con 0
login local
line vty 0 4
login local

Cisco Switches password recovery

Console cable connect to pc and open hyperterminal or SecureCRT

power up switch

press mode butten 1 mins


check the file at flash:
dir flash:
change config.txt ... something like that ... config.old
http_init
boot

Procedure with Password Recovery Enabled

If the password-recovery mechanism is enabled, this message appears:

The system has been interrupted prior to initializing the flash file system. The following
commands will initialize the flash file system, and finish loading the operating system
software:


flash_init

load_helper

boot

Step 1 Initialize the flash file system:

switch: flash_init


Step 2 If you had set the console port speed to anything other than 9600, it has been reset to that particular speed. Change the emulation software line speed to match that of the switch console port.

Step 3 Load any helper files:

switch: load_helper


Step 4 Display the contents of flash memory:

switch: dir flash:


The switch file system appears:

Directory of flash:

13 drwx 192 Mar 01 1993 22:30:48 c3750-ipservices-mz-122-25.SEB

11 -rwx 5825 Mar 01 1993 22:31:59 config.text

18 -rwx 720 Mar 01 1993 02:21:30 vlan.dat


16128000 bytes total (10003456 bytes free)


Step 5 Rename the configuration file to config.text.old.

This file contains the password definition.

switch: rename flash:config.text flash:config.text.old


Step 6 Boot the system:

switch: boot


You are prompted to start the setup program. Enter N at the prompt:

Continue with the configuration dialog? [yes/no]: N


Step 7 At the switch prompt, enter privileged EXEC mode:

Switch> enable


Step 8 Rename the configuration file to its original name:

Switch# rename flash:config.text.old flash:config.text


Note Before continuing to Step 9, power on any connected stack members and wait until they have completely initialized. Failure to follow this step can result in a lost configuration depending on how your switch is set up.

Step 9 Copy the configuration file into memory:

Switch# copy flash:config.text system:running-config
Source filename [config.text]?
Destination filename [running-config]?


Press Return in response to the confirmation prompts.

The configuration file is now reloaded, and you can change the password.

Step 10 Enter global configuration mode:

Switch# configure terminal


Step 11 Change the password:

Switch (config)# enable secret password


The secret password can be from 1 to 25 alphanumeric characters, can start with a number, is case sensitive, and allows spaces but ignores leading spaces.

Step 12 Return to privileged EXEC mode:

Switch (config)# exit
Switch#

Step 13 Write the running configuration to the startup configuration file:

Switch# copy running-config startup-config


The new password is now in the startup configuration.

Note This procedure is likely to leave your switch virtual interface in a shutdown state. You can see which interface is in this state by entering the show running-config privileged EXEC command. To re-enable the interface, enter the interface vlan vlan-id global configuration command, and specify the VLAN ID of the shutdown interface. With the switch in interface configuration mode, enter the no shutdown command.

Step 14 Reload the switch stack:

Switch# reload

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

Router
CTRL+BREAK
CTRL+C
confreg 2142

after finished recovery put it back normal confreg

config 2102

Loading Cisco IOS from rommon mode

Download and install tftpd32 on pc
Configure pc ip address= 10.1.1.1 mask 255.255.255.0
tftp point to ios location on pc: c2600-is-mz.123-25.bin

configure on router rommon:as below

IP_ADDRESS=10.1.1.43
IP_SUBNET_MASK=255.255.255.0
DEFAULT_GATEWAY=10.1.1.1
TFTP_SERVER=10.1.1.1
TFTP_FILE=c2600-is-mz.123-25.bin

rommon 31 > tftpdnld

IP_ADDRESS: 10.1.1.43
IP_SUBNET_MASK: 255.255.255.0
DEFAULT_GATEWAY: 10.1.1.1
TFTP_SERVER: 10.1.1.1
TFTP_FILE: c2600-is-mz.123-25.bin

Invoke this command for disaster recovery only.
WARNING: all existing data in all partitions on flash will be lost!
Do you wish to continue? y/n: [n]: y
.
Receiving c2600-is-mz.123-25.bin from 10.1.1.1 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
File reception completed.
Copying file c2600-is-mz.123-25.bin to flash.
Erasing flash at 0x61fc0000
program flash location 0x61130000
rommon 32 >
rommon 33 > reset

System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)
Copyright (c) 2003 by cisco Systems, Inc.
C2600 platform with 131072 Kbytes of main memory

program load complete, entry point: 0x80008000, size: 0x113aed8
Self decompressing the image : ################################################################################################################################################################################################################################################################################# [OK]

Smart Init is enabled
smart init is sizing iomem
ID MEMORY_REQ TYPE
00036D 0X00103980 C2621XM Dual Fast Ethernet
0X00098670 public buffer pools
0X00211000 public particle pools
TOTAL: 0X003ACFF0

If any of the above Memory Requirements are
"UNKNOWN", you may be using an unsupported
configuration or there is a software problem and
system operation may be compromised.
Rounded IOMEM up to: 4Mb.
Using 3 percent iomem. [4Mb/128Mb]

Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706



Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.3(25), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2008 by cisco Systems, Inc.
Compiled Mon 28-Jan-08 19:21 by alnguyen

cisco 2621XM (MPC860P) processor (revision 0x301) with 126976K/4096K bytes of memory.
Processor board ID JAE0825M0BX (2871101490)
M860 processor: part number 5, mask 2
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
32K bytes of non-volatile configuration memory.
32768K bytes of processor board System flash (Read/Write)

Slot is empty or does not support clock participate
WIC slot is empty or does not support clock participate

Press RETURN to get started!


*Mar 1 00:00:04.743: %LINEPROTO-5-UPDOWN: Line protocol on Interface VoIP-Null0, changed state to up
*Mar 1 00:00:12.499: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
*Mar 1 00:00:12.499: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up
*Mar 1 00:00:12.647: %SYS-4-CONFIG_NEWER: Configuration from version 12.4 may not be correctly understood
*Mar 1 00:00:13.659: %SYS-5-CONFIG_I: Configured from memory by console
*Mar 1 00:00:13.671: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
*Mar 1 00:00:13.671: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
*Mar 1 00:00:15.427: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down
*Mar 1 00:00:15.971: %SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.3(25), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2008 by cisco Systems, Inc.
Compiled Mon 28-Jan-08 19:21 by alnguyen
*Mar 1 00:00:15.975: %SNMP-5-COLDSTART: SNMP agent on host Router is undergoing a cold start
Router>
Router>
Router>en
Router#
Router#
Router#
Router#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.3(25), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2008 by cisco Systems, Inc.
Compiled Mon 28-Jan-08 19:21 by alnguyen

ROM: System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)

Router uptime is 1 minute
System returned to ROM by power-on
System image file is "flash:c2600-is-mz.123-25.bin"

cisco 2621XM (MPC860P) processor (revision 0x301) with 126976K/4096K bytes of memory.
Processor board ID JAE0825M0BX (2871101490)
M860 processor: part number 5, mask 2
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
32K bytes of non-volatile configuration memory.
32768K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

Router#
Router#

Usefull Links

http://www.brainbump.net/download-tutorials/

-> VOIP :

Skype for SIP Beta Integration !
Unified Contact Center Express 7 Scripting
Setting up Extension Mobility on Unified CME
Cisco Unified Mobility Advantage (CUMA) 7 Demystified
7 Easy Steps to setup Cisco ASA Phone Proxy
How to Setup CME SIP trunk to VOIP SIP Service Provider – Part 1
How to Setup CME SIP trunk to VOIP SIP Service Provider -Advanced Config -Part1b
How to Setup CME SIP trunk to VOIP SIP Service Provider – Part 2
How to Setup CME SIP trunk to VOIP SIP Service Provider – Part 3
Easy approach for Configuring and Setting up Cisco Unity Express
Configuring VPIM networking in CUE
Getting Cisco Unified Communications Manager 7.0 Up and Running using VMware!
How to use Cisco IP Phone Services Software Development Kit (SDK) applications to create versatile XML files
How to Register third party SIP phone to Cisco Unified Call Manager Express (CUCME)
How to disable internal web server for Cisco IP Communicator
How to configure Cisco Unified Call Manager Express (CUCME) router for XML Services
How to setup Cisco Unified Call Manager Express (CUCME) router using GNS3
How to Use a Third party SIP phone with Cisco Router
How to configure Cisco Unified Call Manager Express GUI using GNS3
How to register Third party SIP phone to CUCM 5.x/6.x(Cisco Unified Communication Manager)

-> Network Security :

How to emulate Cisco IPS
How to emulate ASA in Windows 7
How to emulate ASA in Ubuntu 9.10 Linux
Configuring ASA 8.x to support AnyConnect SSL VPN Clients
How to lockdown Cisco Router’s Configuration Access
How to configure IOS IPS (Intrusion Prevention System) using SDM in GNS3
How to setup and install Cisco Security Device Manager (SDM) on router using GNS3
How to install and enable ASDM (PIX firewall)

-> Routing/Switching :

How to setup Terminal Server for CCIE Labs
How to configure and setup IPv6 connectivity between Windows XP and Cisco Router
How to setup and configure Cisco Configuration Professional (CCP)
How to Schedule/Automate Periodic Configuration Backups in Cisco IOS

-> GNS3 Specific :

GNS3: Add GUI Qemu Host (tinycore)
GNS3: Add Qemu Host (MicroCore)
GNS3 : How to emulate ASA in Windows 7
GNS3 : How to emulate ASA in Ubuntu 9.10 Linux
GNS3 : How to run multi-pc topology using distributed hypervisors
GNS3 : How to Use Putty Connection Manager for Console Access
GNS3: How to increase Call Manager Express flash disk Size

*****************************************************************************

Beginners

- Internet LAB Tutorial Part 2 (http://www.blindhog.net/gns3-internet-lab-tutorial-part-2/)
- Installation Tutorial for Linux (http://www.blindhog.net/gns3-installation-tutorial-for-linux/)
- How to build an Internet Lab (http://www.blindhog.net/gns3-how-to-build-an-internet-lab/)
- GNS3 Graphical router emulation software (http://www.blindhog.net/cisco-gns3-graphical-router-emulation-software/)

Switching

- Switching lab Part 2 (router on a stick) (http://www.blindhog.net/gns3-switching-lab-part-2-router-on-a-stick/)
- How to build a switching lab Part 1 (http://www.blindhog.net/gns3-how-to-build-a-switching-lab/)

Security track

- How to install and enable ASDM (PIX firewall) using GNS3 (http://www.brainbump.net/2008/07/how-to-install-and-enable-asdm-pix-firewall-using-gns3/)
- How to configure IOS IPS (Intrusion Prevention System) using SDM in GNS3 (http://www.brainbump.net/2008/07/how-to-configure-ios-ips-intrusion-prevention-system-using-sdm-in-gns3/)
- How to use Pemu as your personal firewall (http://www.blindhog.net/gns3-use-pemu-as-your-personal-firewall/)
- How to communicate with Pemu (http://www.blindhog.net/gns3-how-to-communicate-with-pemu/)
- Pemu PIX emulator with GNS3 (http://www.blindhog.net/pemu-pix-emulator-with-gns3/)

Voice track

- How to build a voice lab with GNS3 and VMWare (http://www.blindhog.net/how-to-build-a-voice-lab-with-gns3-and-vmware/)
- How to use a third party SIP phone with Cisco routers using GNS3 (http://www.brainbump.net/2008/07/how-to-use-a-third-party-sip-phone-with-cisco-router-using-gns3/)
- How to setup Call Manager Express (CME) router using GNS3 (http://www.brainbump.net/2008/07/how-to-setup-call-manager-express-cme-router-using-gns3/)
- How to configure Cisco Unified Call Manager Express GUI using GNS3 (http://www.brainbump.net/2008/06/how-to-configure-cisco-unified-call-manager-express-gui-using-gns3/)
- How to configure Cisco Unified Call Manager Express (CUCME) router for XML Services (http://www.brainbump.net/2008/07/how-to-configure-cisco-unified-call-manager-express-cucme-router-for-xml-services/)
- How to register third party SIP phone to Cisco Unified Call Manager Express (CUCME) (http://www.brainbump.net/2008/07/gns3-how-to-register-third-party-sip-phone-to-cisco-unified-call-manager-express-cucme/)
- How to setup CME SIP trunk to VoIP SIP Service Provider Part 1
(http://www.brainbump.net/2008/09/gns3-how-to-setup-cme-sip-trunk-to-voip-sip-service-provider-part-1/)

Misc.

- How to save labs with router configs (http://www.blindhog.net/gns3-how-to-save-labs-with-router-configs/)
- How to build a frame-relay lab (http://www.blindhog.net/gns3-how-to-build-a-frame-relay-lab/)
- How to integrate a Microsoft Loopback interface with GNS3 (http://www.blindhog.net/how-to-integrate-a-microsoft-loopback-interface-with-gns3/)
- How to use Putty for console access (http://www.blindhog.net/gns3-how-to-use-putty-for-console-access/)
- How to use Putty Connection Manager for console access (http://www.brainbump.net/2008/08/gns3how-to-use-putty-connection-manager-for-console-access/)
- How to setup and install Cisco Security Device Manager (SDM) on router using GNS3 (http://www.brainbump.net/2008/07/how-to-setup-and-install-cisco-security-device-manager-sdm-on-router-using-gns3/)
- How to setup and configure Cisco Configuration Professional (CCP) (http://www.brainbump.net/2008/07/gns3-how-to-setup-cisco-configuration-professional-ccp-on-router/)
- How to lockdown Cisco Router’s Configuration Access (http://www.brainbump.net/2008/08/gns3-how-to-lockdown-cisco-routers-configuration-access/)
- How to configure and setup IPv6 connectivity between Windows XP and Cisco Router (http://www.brainbump.net/2008/08/gns3-how-to-configure-and-setup-ipv6-connectivity-between-windows-xp-and-cisco-router/)
- How to run multi-pc topology using distributed hypervisors in GNS3 (http://www.brainbump.net/2008/08/how-to-run-multi-pc-topology-using-distributed-hypervisors-in-gns3/)


credit : www.gns3.net/documentation / www.blindhog.net / www.brainbump.net