Amazon.com Widgets

May 21, 2012

Comparing HSRP Versus VRRP – Same Thing Only Different?

decisions

Decisions, Decisions When configuring high availability gateways between multiple routers you only have a couple of options to choose from. If you have all Cisco routers chances are you will be configuring and using HSRP to provide redundancy between your routers. If you have Juniper, Foundry (Brocade), or any another router you’ll most likely use [...]

The Many Faces of Link Aggregation

many faces of LAG

If any technology in networking  had identity issues, it would have to be Link Aggregation.   This simple process can never seem to make up its mind what it wants to be called. Link aggregation is the process of combining two or more connections into a larger pipe to allow for more throughput. If you [...]

Meet the ARP Family – ARP, inARP, GARP and RARP

what is ARP

What is ARP? ARP or Address Resolution Protocol is a simple communications protocol used primarily today in IP and Ethernet networks.  It’s main purpose is to discover and associate IP addresses to physical MAC hardware addresses. How does ARP work? When a computer needs to send data across a network to another physical device, it [...]

Using PING to Troubleshoot Network Problems

One Single Ping

Problem Diagnosis With Ping By Steve Waddington The two most used tools, and almost always the first used to diagnose a network problem are traceroute and ping. The results they return are however most often misunderstood or interpreted in a way that leads to an incorrect conclusion. Let’s take the ping utility specifically. The common [...]

Errdisabled – Taking Ports OFFLINE Like the MCP from TRON

Errdisable is like the MCP from TRON

Everyone remembers the original movie TRON where the character Flynn, played by Jeff Bridges, is sucked into the microscopic world of computer games.  In the movie the villain was the Master Control Program or MCP who would take programs OFFLINE if they misbehaved. Switches have their own MCP (of sorts) which takes network switch ports [...]