From the category archives:

Cisco IOS

Lab notes – WB1 Lab4 Part 1

by Jimmy Larsson on February 26, 2010

Cisco IOS Zone Based Policy Firewall

by Jimmy Larsson on February 4, 2010

PAM-table – a sheat-sheet for well known port numbers

by Jimmy Larsson on February 3, 2010

IOS Archive feature

by Jimmy Larsson on January 22, 2010

Cisco ACL logging with cookies

by Jimmy Larsson on January 15, 2010

CCIE Security – filter output of show commands

by Jimmy Larsson on January 11, 2010

CCIE Security – Creating vlans on a router

by Jimmy Larsson on January 11, 2010

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The Unknown
As we know,
There are known knowns.
There are things we know we know.
We also know
There are known unknowns.
That is to say
We know there are some things
We do not know.
But there are also unknown unknowns,
The ones we don’t know
We don’t know.

—Feb. 12, 2002, Department of Defense news briefing