Why we need TelePresence?

TelePresence for short, is a better video conference "room" system with "HD video quality" and "1:1 people size".

Fwd: Choosing Different Passwords for Different Websites

I always wonder how to pick a good password, strong enough not to be guessed, and easy enough to be remembered, for my so many identities on the Internet.

I believe this post might be a good start!
Digital Inspiration - Choosing Different Passwords for Different Websites

Fwd: 10 Networking Books to read before you die – My Etherealmind

I came across this post. I have some comments to share with you.

10 Networking Books to read before you die – My Etherealmind

Unlicensed radio bands open wide - FCC approved

Federal Communications Commission (FCC) of United States approved the use of new unlicensed radio bands on September 23, 2010.

Fw: The Day The Routers Died...

Take a break, and listen to some music!

Source of Cisco IOS "show ip bgp" screen outputs: archive.routeviews.org

It would not be easy for us to capture meaningful BGP table in the lab environment. An archive site of "University of Oregon Route Views Project" provides us such samples of captures.

Incident details of last Friday, by RIPE NCC

This is the follow-up of last Friday's incident, by RIPE NCC.

Some Internet BGP routers reset neighbors within half an hour last Friday

We know when the BGP neighbor relation resets itself, the network would become disrupted before the new relation re-establishes. In the Intenet BGP scenario, this means a sudden outage of couple of minutes.

This was what happened last Friday (August 27, 2010, from 08:41 to 09:08 UTC)

PC attached ports are no exceptions to Spanning Tree Protocol processing

I came across this page on Cisco.com. I do not agree with some text mentioned inside.

STP Rule 4—All the other ports in all the switches (VLAN-specific) must be placed in blocking mode. The rule only applies to ports that connect to other bridges or switches. STP does not affect ports that connect to workstations or PCs. These ports remain forwarded.

TCP Denial of Service Vulnerability of Cisco IOS 15.1(2)T

If the IOS version your Cisco Router (or Switch) is 15.1(2)T and exposed publicly on the Internet, you might have to schedule an emergency IOS update this weekend.

Cisco stopped Web Application Firewall (WAF) product

Full name of this product on Cisco.com is "Cisco ACE Web Application Firewall".

An ultimate ruggedized Branch Office Box

I came across this post on Riverbed's blog. What a ruggedized box!

Advices for college students preparing CCNA Exam

A college student Email asked me how to prepare CCNA Exam. I gave him my advices, and I also would like to share them with you all!

Simple BGP Multipath Test in Packet Tracer 5.3

This is another simple BGP test file in Packet Tracer 5.3. We can see selection of the best route by AS_PATH.

My VLANs are all gone?! "VTP Chaos" Packet Tracer Demo

This file was inspired by the example presented in APJ Instructor Forum on July 15, 2010.

Possible questions about IPv6 for home users

For Internet home users, you need to understand more about IPv6.

How to look up the "default passwords" on the web?

Youtube Video: "Learn the Default Password for Every Network Router!"

IPv6 address types reference sheet, from ICANN blog

ICANN released a free "IPv6 Address Types" reference sheet.

Packet Analyzer on the Cloud: CloudShark.org

CloudShark.org is "A (Wire)shark at the cloud" !

Performance Estimate of new Cisco NSS 300 Series Smart Storage

Cisco's new NSS 300 Series has much more performance than predecessors!

Smart Grid and new Cisco Connected Grid solutions

Cisco recently released new Connected Grid routers and switches.

IPv6 hardware support: new Cisco Catalyst 4948E Ethernet Switch

Cisco's new hardware: Catalyst 4948E Ethernet Switch.

How many subnets are in your network? A quick estimate

A quick method to estimate the total number of subnets in your network.

Cisco's ClearAir technology for Wireless LAN: my understandings

A whole new Wireless LAN security feature from Cisco.

BGP sample practice, in the new Packet Tracer 5.3

I created this practice to test the Packet Tracer 5.3 features of BGP.

Possible actions to begin with for entering IPv6 era

Internet Protocol Version 6 (IPv6) is no longer a brand new technology. Internet communication system workers like us would be expected to do well on IPv6 deployment, without doubt.

After Microsoft Windows Vista was delivered, however, we could no longer excuse ourselves procrastinating on IPv6 deployment.

In fact, it would be quite difficult now to find non-IPv6-capable client hosts! From computers with FreeBSD, Linux, Microsoft Windows, Apple (OS X), and mobile phones such as Nokia phones (Symbian OS), Windows Mobile, Google Android, and even to game consoles such as Nintendo Wii, Sony Playstation 3, all of them already support IPv6 right now!

We could have lived in a "Pure IPv6" world today, if the Internet were fully ready for IPv6. What a pity!

New CCNP Certification: Save some money before July 31, 2010

CCNP certification requirements will be revised after July 31, 2010. You will have to pass 3 new exams to get CCNP certified:

• ROUTE (original, BSCI)
• SWITCH (original, BCMSN)
• TSHOOT

Since the new CCNP does not count ISCW and ONT, your passed result of ISCW or ONT will remain valid only before July 31, 2010. BSCI and BCMSN, on the other hand, will still be counted as ROUTE and SWITCH respectively.

I think I found one timely approach to get your same CCNP with less costs!

Using "peer-group" shutdown to prepare BGP peer configurations without bothering

I was doing a BGP lab with my students.

I wanted to pre-configure some BGP neighbors, and I wanted all neighbor sessions to start at once only by some simple commands. Furthermore, I do not want to bother my students by retrying BGP neighbor connections before they completed their BGP neighbor configurations.

I came up this small trick to achieve above goals:

Do not use these passwords, ever!

I received this post on Twitter. The topic is about "Popular Passwords" of a real (hacked) site as an example.

Since the post is published, if it happens to you that your password is one on the list, be sure to change it immediately!

IOS Command "show mac-address-table address" also accepts formats like "00-12-34-56-78-90" and "00:12:34:56:78:90"

Both "00-12-34-56-78-90" and "00:12:34:56:78:90" formats work in IOS.