Ars Technica

Cisco 1841 VLANs

Can anybody give me a step by step guide for setting up multiple VLANs on a Cisco 1841 modular router? I can't find anything to help me through my problem, which, incidentally, is that I can create ...
Ars Technica

Cisco IP Phones showing MAC's in 2 vlans?

I've got a problem, I've been trying to implement some layer2 security on our switches with Port-Security, only allowing 2 MAC addresses on any 1 switchport. I've been looking at some of our switches ...
Network World

Tagging the native VLAN

In Cisco LAN switch environments, the native VLAN is typically untagged on 802.1Q trunk ports. This can lead to a security vulnerability in your network environment. It is a best practice to ...
Network World

The eight most important commands on a Cisco ASA security appliance

Here’s a guest post sent to me by Don Crawley, author of The Accidental Administrator book series. It is an excerpt from his latest:The Accidental Administrator: Cisco ASA Security Appliance: A ...
Computer Weekly

VLANs -- Controlling wired and wireless traffic

VLANs break a physical LAN into several logical broadcast domains. Each LAN station hears traffic sent by its own VLAN but receives nothing from stations in other VLANs -- not even from those ...