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I needed to get Java working with Firefox on my CentOS box.  The primary reason was to do some additional NAC testing with Linux.  I've been having a much harder time getting it installed than I originally thought.  I finally got it working and wanted to share my steps and…

You have a lot of switches and routers, more than you care to count. The IOS in each of them is now old and needs updating. You’re not looking forward [...]

The Cisco NAC subnet filter is used to allow computers to bypass authentication and optionally perform posture assessment.  The optional posture assessment is based on the role that is assigned to the subnet filter.  These subnets can be added through the NAC Manager Web GUI or through the NAC API.…

When Cisco NAC is used in out-of-band (OOB) mode, SNMP read and write functionality is critically important.  The NAC Manager uses the SNMP write community to change the VLAN that individual switch ports are connected to.  For example, after a user passes NAC authentication and posture assessment, the end computer…

I was doing some research on the costs and causes of network downtime and came across a more recent white paper than the information from 2001 that I had previously [...]

I learned something new at CiscoLive: hsrp preempt delay and why it should be used. In the Resilient Campus Design session, the presenter discussed factors and configurations that make a [...]

I was recently checking out a product that does syslog correlation and noticed that it had not reported a couple of events that I could see in syslog-ng’s log. I [...]

With SSL certificates, there is the concept of a public key and a private key.  When looking at traffic sent from the client to the web server, the public key is used to encrypt data and the private key is used to decrypt data.  The client gets the public key…

Cisco announced the CCIE Grandfathering?“) At these sessions, I have voiced support for a program in which a senior CCIE could opt to exit the program, yet retain the right [...]

CiscoLive 2010 is the premier event for anyone who uses Cisco products. There is a lot to see and people to talk with at this conference. There are Cisco staff [...]

#!/usr/bin/perluse strict;use warnings;use Getopt::Long;use Opsware::NAS::Connect; my($host,$port,$user,$pass) = (‘localhost’,’$tc_proxy_telnet_port$’,’$tc_user_username$’,’$tc_user_password$’);my $device = ‘#$tc_device_id$’;my @output;my @data;my @auth_ports = ();my $foundauth_flag = 0;my $foundaccess_flag = 0;my $done_flag = 0;my $access_vlan;my $auth_vlan; my $con = [...]

CiscoLive offers me the chance to renew my CCIE every year by allowing attendees to take a free test.  It is a great way to get a $350 rebate on [...]