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Friday, December 24, 2010

Why we need TelePresence?

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


Friday, October 22, 2010

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

Tuesday, September 7, 2010

Monday, August 30, 2010

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)

Wednesday, August 25, 2010

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.

Friday, August 13, 2010

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.

Thursday, July 29, 2010

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!

Friday, July 23, 2010

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.

Wednesday, July 21, 2010

Tuesday, July 20, 2010

Saturday, July 17, 2010

Saturday, April 17, 2010

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!

Thursday, April 1, 2010

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!

Thursday, March 18, 2010

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:

Thursday, January 21, 2010

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!

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