When working with the Cisco IOS, it’s very important to know your TCP and UDP port numbers. This is especially true when creating IOS access control lists (ACLs). Let’s take a closer look. What’s a ...

HappyRouter.com has come across a free tool called the Cisco ACL Editor and Simulator. Developed by U.K. Cisco expert Gareth O. Evans, while he was studying at the Unversity of Wales, in North Wales, ...

I have a situation where I need to get a server setup that requires ACL's, then I need to move it to another subnet. I thought I'd try setting up DNS client on the router, as it is supported. Here are ...

While ICMP is required for IP network traffic redirection and pinging hosts on your LAN or WAN, ICMP can also pose a security concern. David Davis tells you about the basics of ICMP and how to filter ...

Patching routing and switching infrastructure in any organisation is often delayed, sometimes due to the potential impact on production systems and sometimes because the IT resources are simply too ...