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 the main one. Once one or […]
Aaron's Worthless Words
It's possible that someone somewhere needs to know this.
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 NET file under a router, the contents of that file […]
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, a policy is an object […]
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 the neighbors access-list 101 permit tcp any host 192.168.0.1 eq […]
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 that the only people in the […]
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/Unix app; in the Windows world, TCPDump is […]
My friend Josh over at blindhog.net has found a collection of cheat sheet gems for the network dude(tte). There’s sheets on BGP, OSPF, Subnetting, QoS, connector types, and more. Check it out. Cheat Sheets – Packetlife.net
Here’s a simple one since I haven’t updated in a while. I have my ASA 5505 at home and want to forward TCP/80 traffic to my public IP to my webserver at 10.10.10.10. There are two steps here — forward the port and open the ACL. To forward the port, I would use the static […]
We run a large number of LANs all over the country that are “controlled” by the particular business unit. We manage the gear, but, since they have the money and have to pay for anything we do, they make the final decision on what gets put in. Sometimes that gets out of hand, as you […]
Josh over at Blindhog.net has an article linking to a bunch of Cisco IP Phone videos — from the 7906 to the 7975. These are Cisco videos and a good place to start if you don’t know anything about their IP phones.