Aaron's Worthless Words

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Aaron does lots of stuff and, therefore, does nothing well. He's trying, though. https://masto.ai/@aconaway

Trunking on a Catalyst Switch

If you didn’t now already, trunks are connections between switches that carry traffic for all VLANs. It allows you to have, say, VLAN 10 and VLAN 20 on two switches appear as the same network. Unless you’re a really small shop, you’ve already dealt with trunks, so

HSRP vs. GLBP

HSRP (Hot Standby Router Protocol) is a Cisco-proprietary method for supplying a highly-available gateway for hosts to use. GLBP (Gateway Load Balancing Protocol) does the same thing. So, what’s the difference? HSRP works on layer 3 and provides a standby IP address for hosts on that network to use

GRE Tunnels and Encryption

GRE tunnels rock. They are interfaces on a router that are used to “connect” to another router somewhere on your LAN, your WAN, the Internet, wherever. The most popular use for them is for router-to-router VPNs. I’ll let my friend Josh from blindhog.net show you how to do

Resetting Sections of the Config

I was configuring a switch the other day and realized I had configured a trunk on the wrong port. God, I hate that. Instead of dumping the configuration for the port and doing a “no” on each line, I used the default command. Switch(config)#default interface G0/1 This

AFOL-KE and Above.net

It looks like there was another bad BGP announcement over the weekend. This time, a 24-bit network belonging to the country of Kenya was being advertised by Above.net. The heart of the problem is the same as it was with the YouTube problem a few weeks ago: someone who

NAT on a PIX/ASA

NATting sucks and can be confusing. I’m sure everyone agrees to that, but you have to use it at some times. In a PIX/ASA, it’s easy to configure a simple setup, but can be super-complicated in larger networks. In a simple lab, we have set up an

Commenting Access-lists

There’s a very-overlooked feature of access-lists — the remark. Yes, this is very basic, but it’s worth mentioning, as it has saved me anguish time and time again. I use remarks to document each line of an ACL (on IOS, PIX, FWSM, ASA, etc.) so that when I go