You can deploy some modern firewalls in Layer 2 mode such that they are transpart
WiFi Interference – MetaGeek Chanalyser and DBx Help!
23rd April 2012 by 3 Comments
I’ve got wireless problems that I can’t solve. I’m using the MetaGeek Chanalyser and a Wispy DBx to perform spectrum analysis and I can’t work out what these bursts are.
Basics: Cisco VLAN Trunking Protocol – Transparent Discard and Passing VTP Packets
11th April 2012 by 7 Comments
It’s a common discussion about when Cisco VTP protocol is actually forwarded through Cisco switches and when it’s isn’t. I’ve always gotten it somewhat confused and when I stumbled across some old notes on the topic I had an ah-hah moment. I’m answering the equation about when using VTP in your network, which versions are risky – that’s risky is terms of how do you prevent VTP updates from ‘crossing’ a switch.
From the “Why Use a VPN?” Department. Microsoft RDP Flaw Announced.
14th March 2012 by 3 Comments
Microsoft announces zero-day exploitable RDP flaw that gets full compromise of server. Expects worm to be available within thirty days. I get to gloat and say “I told you so” to all Microsoft admins everywhere.
Using Underscores, Hyphens or CamelCase in Naming Standards
27th January 2012 by 7 Comments
I’ve been considering a small but vital problem in naming conventions in Networking. Namely, the use of underscores and hyphens in object names and devices. It’s a hot topic for argument when the time comes for corporate standards (and when Network Engineers have beverages in a public house). Now, I figure that there are three possible grammar options for making names – hyphens, underscore and CamelCase.
Can Fibre Optic Ethernet Cables Be Longer Than the Standard ?
1st January 2012 by 8 Comments
Short Answer is “It depends, but usually yes.” Long answer follows with a discussion of launch power, receiver sensitivity, and cable losses.
Responding: On Optimizing Traffic for Network Virtualization
23rd December 2011 by 15 Comments
I’m responding to Brad Hedlund’s post “On optimizing traffic for network virtualization” where he seems to missed a key point. It’s about cost of ownership in terms of ability to troubleshoot.
ASA 5520 and ASA 5540 With Only One DIMM Memory Socket – Counterfeit Hardware
20th December 2011 by 1 Comment
There is a significant numbers of ASA5110 chassis that have been reworked to look and act like ASA5520 or ASA5540 firewalls. Refer this bug toolkit for more details.
Cisco Nexus NXOS and Fixing Broken “Switchto” Syntax With Alias
18th December 2011 by 3 Comments
Why does Nexus NXOS use ‘switchto’ instead of ‘changeto’ for the CLI ?
Fibre Connectors
14th July 2011 by 16 Comments
A short summary of the Fibre Cable Connectors, description and some notes on usage. This is summary notes and intended for reference.
