We feature technical articles across the entire IT spectrum - CCNA networking, security, operating systems, cloud, and programming.

PEMU – Free Cisco PIX Firewall Emulator / Simulator

Introduction This is a guide on how to install a Free pix emulator / simulator onto a linux platform. You can also obtain the windows version, which you can find (along with other tutorials and forum) at the ariscahyadi blog. This software was written by mmm123, and is called PEMU, which is based on the … Read more

Windows – MSI runas fix

As default (SP1 & SP2) you could not do a run as on an MSI file, which in a windows admin role, is somewhat of a pain……. Below is the reg entry to fix this annoying feature, just copy the below (including the windows line) into notepad, save as a .reg file then once saved, … Read more

Solaris – How to add a route

To add the route, use the following syntax, /usr/sbin/route add host [destination ip] [via ip] Then add this as well to your routes script (so it survives a reboot) in the /etc/rc?.d, i normally just do a find for the routes file in /etc. find /etc -name *routes*   If there isnt one then you will … Read more

What have you been doing on my machine ?

A few reg keys which you may find useful to find out what someone has been doing on your machine. reg query HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\RunMRreg query “hkcu\software\microsoft\internet explorer\typedurls”reg query hkcu\software\realvnc\vncviewer4\mru Get to this reg key via the regedit GUI (via run / regedit) HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.doc 

PIX – Static NAT

Below is an example of static NAT for FTP when using the outside interface with a DHCP address assigned to it. static (dmz,outside) tcp interface ftp ftp netmask static (dmz,outside) tcp interface ftp-data ftp-data netmask  

Nokia`s VRRP

Nokia`s VRRP protocol allows for an active-standby firewall cluster. Nokia have added an extension to VRRP called VRRP monitored circuit which handles both total firewall failure as well as interface failures. Each virtual router uses a mac address of 00-00-5E-00-01-XX. XX being the Virtual Router ID (VRID).The multicast of and IP protocol number 112 … Read more

Enable Active Mode FTP in Internet Explorer

By default Internet Explorer is configured to run in passive mode ftp when using it as an ftp client (over http).To change the Internet Explorer FTP client mode to Active, do the following, Start Internet Explorer. Click Internet Options on the Tools menu. Click the Advanced tab. Uncheck the box “Enable Folder View for FTP … Read more

Router – Secure a Router – Basic

Below are a few steps to set up basic security on a router, Banner Set Banner. (config)#banner motd Passwords Set Secret enable password. (config)#enable secret <password> Set Line terminal passwords. (config)#line <terminal> <number>(config-line)#password <password>(config-line)#login Line Timeout On VTY set timout out (config-line)#exec-timeout <min> Copy the Config changes #(config) Copy running-config startup-config


In application software v6.0 and later, the Rapid Spanning Tree Protocol (RSTP) replaces the 802.1D Spanning Tree Protocol (STP). STP is pretty slow at recovering from a failure in the network. RSTP was created to decrease this recovery time. When a switch is running RSTP, a port can change from blocking to forwarding more quickly … Read more

CISCO – Port Range

To select a range of ports, (config)#interface range fast0/1 – 10 (config-if-range)# [any command required]