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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/

Cheat Sheets from Packetlife.net

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

Port Forwarding on the ASA/FWSM/PIX

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

Storm Control

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

Cisco IP Phone Videos at Blindhog.net

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.

Star-crossed Lovers: HSRP/VRRP and NAT

I was doing an HSRP lab the other day, and a project from the past popped into my head. A customer had a host on a network that was separated from the rest of the network by a 1700 with a couple of FEs. They wanted that host to be

Getting Started with the FWSM

Have I talked about the Cisco Firewall Services Module (FWSM) before? It’s a firewall on a module for the 6500 and is based on the PIX firewall. The term “based on” is important here, since it does a lot of stuff the PIX does but everything. It obviously does