How to Upgrade Cisco Flash Firmware Version

  I recently had to upgrade a Cisco router to a new firmware version, so I thought I’d write up a quick how-to guide. Prerequisites: Download the new flash version from Cisco here (you need a valid Cisco login) TFTP the firmware to the Cisco device by following this TFTP guide Connect to the Cisco device… Read more »

Using a Cisco router with Telstra FTTH Velocity Service

I recently got fibre to the home (FTTH) or as some other people like to call fibre to the premise (FTTP) thanks to Telstra and their Velocity service. Now is is quite straight forward, someone comes out and connect activates the ONT unit. In my case the fibre is terminated at the ONT unit and… Read more »

Basic Cisco Router Configuration

Assumptions The following is a list of assumptions, they don’t specifically have to be used and can be modified to suit your setup. Using “Dialer0” interface to connect to ISP Using CHAP for authentication Using DHCP IP assignment from ISP Using Google name servers Using standard MTU size (1452) Configuration Enable Terminal Monitoring Change Host… Read more »

Cisco File Copy from Flash to TFTP

Assumptions: A working TFTP server No restrictions for UDP packets to be sent from Cisco device to TFTP server (port 69) Procedure: TFTP Server 1. Create a file on the TFTP server 2. Change the permissions Cisco Device 3. Copy the file from the Cisco device Should you have any questions, comments or suggestions, please… Read more »

Reset a Cisco Router to Factory Default Settings

There are currently two ways to reset a Cisco router or switch to factory default. Reference: http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/products_tech_note09186a00802017a1.shtml Method 1 This method uses the config-register 0x2102 command in global configuration mode. Method 2 This method uses the config-register 0x2142 command in global configuration mode. Should you have any questions, comments or suggestions, please don’t hesitate to comment… Read more »

Cisco “Exit Interface Failed Test” using SDM or CCP

Cisco “Exit Interface Failed Test” using SDM or CCP When doing Cisco connectivity tests, you can stumble upon vague error messages that leave you feeling a little inadequate. I encountered one recently when reconfiguring my Dialer0 outside interface for a DSL connection, it ended up being so simple so I thought I’d share it with… Read more »

How to block telnet and SSH on outside interface on Cisco routers

How to block telnet and SSH on outside interface on Cisco routers By default, a lot of Cisco routers allow Telnet and SSH on the outside interface, this can cause a large security risk of being brute force attacked. Ideally Telnet should be blocked completely as it is an unsecure protocol and SSH should only… Read more »