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

How Screen Can Change Your Life

Alright, that’s an exaggeration, but screen is pretty freaking cool. It’s an app that’s (usually) run under Linux that lets you run commands then detach from that session and reattach later. It doesn’t seem like much, but a few examples can show what it does for

Backup Servers on the CSM

On the CSM, you can configure a vserver to use a main and backup serverfarm which is used if a serverfarm is toast. If all the RIPs in the main farm are out-of-service, the CSM will start to treat the backup farm just as if it’s configured to be

Loading Configs at Startup in Dynagen

Here’s a quick one for you. In Dynagen, if you want to load a configuration when you first fire up the router instance, you can use the cnfg tag in your NET file like this. cnfg = /home/jac/labs/cfg/R0.cfg If you put that in your dynagen

Intro to Policies on the CSM

The CSM is pretty bad little box. It not only watches layer 4 items like TCP connections, but also talks HTTP, which you can use to do some custom, or policy-based, load balancing. Policies are the objects that make custom balancing work. Like everything else (it seems) on the CSM,

ACLs and HSRP, BGP, OSPF, VRRP, GLBP...

Here’s a handy list of ACL entries to allow your devices to speak routing protocols, availability protocols, and some other stuff. We’ll assume you have ACL 101 applied to your Ethernet inbound; your Ethernet has an IP of 192.168.0.1. * BGP : Runs on TCP/179 between

Getting Something Out of the CSM

My buddy told me that my site is the only place on the web with documentation on the Cisco Content Switching Module (CSM). I also noticed a few months ago that every TAC case I’ve opened on the CSM has been handled by the same guy. I seriously think

A Must-Know: TCPDump

If you’ve never used TCPDump before, you’re missing out on one of the best parts of being a network guy — pointing fingers at everyone else. TCPDump is an open-source app that copies packets on a machine’s NIC to screen or to file. TCPDump is typically a Linux/