Tag: cisco

Cisco stuff

Cisco’s Content Switching Module (CSM) is an application accelerator. Or is it an application networking service module? I hate those fancy buzzwords — it’s a load balancer. It’s a module for the 6500 series switches that lets you load balance services in any VLAN and…

Most firewalls should block [tag]ICMP[/tag] requests to them, so how do you know that your router or server has layer-2 connectivity to one? It’s pretty elementary, actually, but I’ve found that not a lot of people know this trick. If you ping the firewall, it…

Remember the article on router-on-a-stick? And the one on HSRP? Let’s add to that example network, shall we? Let’s make those routers into edge routers so they connect your internal network to the Internet with some size circuit. Let’s just say they each terminate DS3s…

I finally got around to looking into [tag]SNMP[/tag] v3 and was shocked at how easy it actually is. When I first looked up info on it so many moons ago, I saw table after tables of views and privilege levels and thought I would have…

By default, most Cisco [tag]IOS[/tag] devices come configured to be accessed via telnet. This is probably fine for your house, but I really cringe when I run across corporate networks that use [tag]telnet[/tag] to access the devices. Telnet is old and out-dated and can be…

In the article describing a router-on-a-stick, I mentioned that I would use two routers that run HSRP for availability, so I figured that I would write up a short post on what it is and how it works. HSRP (Hot Standby Router Protocol) is a…

Ever heard of a router-on-a-stick? Go ahead and laugh…everyone does. It’s a funny name for a very serious topic, though. A router-on-a-stick is a network configuration that uses a single router interface as a gateway for more than one network segment. You literally take a…

Here’s a list of IOS commands that I use all the time that aren’t a part of the basics. I obviously use more than just these, and you do, too, but I hope there’s at least one eye-opener in there. show env all: Shows the…

We just an HP C-class blade chassis which included two GbE2c network modules.  These modules are Nortel switches running AlteonOS that connect the blades to the rest of your network.  When I turned these guys up the other day, every VLAN stopped working, so I…