Cisco



How to dynamic NAT on Cisco ASA ASDM

Dynamic NAT / PAT / HIDE NAT / NAT Overload Dynamic PAT (Port Address Translation), HIDE NAT and NAT Overload all refer to the same meaning – which is to dynamically NAT your internal network address segment to one IP…



Linksys SRW2024 recover from failed firmware update

So you’ve bricked your Linksys SRW2024? Apparently many users have issues upgrading the firmware on this switch. Most realize once after applying the latest update and rebooted, the switch no longer responds and the management interface cannot be accessed. This…


How to clean up old images on IOS XE

Problem If you ever run into the following error messages: %Error copying usbflash0:cat3k_caa-universalk9.SPA.03.06.04.E.152-2.E4.bin (Not enough space on device) or % flash: requires 295884 KB of free space, but only 167160 KB is available. Operation aborted. You’ve run out of disk…



How to show hidden default Cisco IOS configurations

Where did my “switchport access vlan 1” command go? Have you ever noticed that Cisco has loaded default configurations onto the switch without showing it on your startup or running config? “switchport access vlan 1” is a good example. Take…


LACP vs static link aggregation

What is static link aggregation? Static link aggregation is a method of combining or bundling of multiple switch ports or nics to form a single etherchannel. It increases throughput and redundancy for the two connecting devices. A static link aggregation…


How to setup a simple Cisco IOS Firewall

Classic Firewall There are two configuration models to setup a firewall on IOS; the classic firewall (used to be called CBAC – Context based access control) and the zone based firewall. In this post I’m going to document how to…