Network technologies and trends

May 22, 2010  6:56 AM

Multiple Access Points in SMB – Common Mistakes done

Posted by: Yasir Irfan
Common mistakes in Multiple Access Points, DHCP Server, DHCP Services, Internet gateway, Linksys’s Access Points, Network Printer, Network Tips, SSID, Wireless tips, Wirless Access Points

Last week one of my friend called me there have a serious problem with their Network, none can print in their Network Printer, only few people can access the internet. Since it’s a Small Business Organization with less than 100 people working they had a pretty simple Network Setup mainly for internet, email and printing. They are using most of the Linksys’s Access Points for their Wireless Network. But often people fail to consider the following while installing multiple Access Point in their offices.

1)      Most of the people fail to disable the DHCP services in the access points which lead to multiple gateways in a small network which leads to problem in accessing the internet and other services they are using.

2)       One more common mistake I noticed is they configure SSID in the same channel which leads to channel over lapping.

3)      Forget to disable DHCP services in their Internet gateway even though they have a dedicated DHCP server.

May 16, 2010  7:36 AM

NX-OS and Nexus rules the next generation Data Centers

Posted by: Yasir Irfan
2000, advantages of NX-OS, Cisco Innovations, Cisco Press, Cisco Unified Communications Manager (UCS), Configuring Nexus Swicthes, InformIT, Network Administrators, Next generation Data Centers, Nexus, Nexus 1000v, Nexus 4000, Nexus 5000, Nexus 7000, Nexus Switching, NX-OS, NX-OS and Cisco Nexus Switching, Safari Online, Virtualization



Since we all know Cisco Systems has introduced Nexus Switches and NeXt-generation Operating System (NX-OS). I was wondering how  am  I going to configure them in our expansion project? As we are expected to have Nexus 7000, Nexus 5000 and Nexus 2000 Series Switches.


Thanks to Cisco Press soon they are releasing a title NX-OS and Cisco Nexus Switching which addresses the operation, use and configuration of the NeXt-generation Operating System (NX-OS) for Cisco data center products.


Picture Courtesy: Cisco Press


Currently the rough-cut pages of the title NX-OS and Cisco Nexus Switching are available. I just had a glance of some sample pages for some chapters.  The new title NX-OS and Cisco Nexus Switching has seven chapters


Chapter1: Introduction to Cisco NX-OS

Chapter 2: Layer 2 Support and Configurations

Chapter 3: Layer 3 Support and Configurations

Chapter 4: Multicast Configuration

Chapter 5: Security

Chapter 6: High Availability

Chapter 7: Serviceability

Chapter 1 deals with an Introduction to Cisco NX-OS and I liked the way sections covered in this chapter. The author starts with an overview of NX-OS and its advantages, some of the advantages of NX-OS are


Unified data center operating system

Robust and rich feature set with a variety of Cisco innovations

Flexibility and scalability




IPv4 and IPv6 IP routing and multicast features

Comprehensive security, availability, serviceability, and management features

Currently the NX-OS platform is supported by following platforms

Nexus 7000

Nexus 5000

Nexus 2000

Nexus 1000V

Cisco MDS 9000

Cisco Unified Communications Manager (UCS)

Nexus 4000


Overall this title seems to very interesting and useful for the Network Administrators who are exploring their skills in the world of NX-OS. Eagerly waiting for Cisco Press to release this title in book format until then keep enjoying the rough cuts.

May 11, 2010  5:10 AM

Cisco create’s world’s first self healing AP

Posted by: Yasir Irfan
3500e, 3500i, 802.11 n wireless access point, BandSelect, Cisco 3500, Cisco 3500 Series Access Point, Cisco 3500 Series APs, Cisco Access Point, Cisco Aironet heritage, Cisco News, Cisco Wireless, CleanAir, ClientLink, external antenna, self healing, self-optimizing wireless network, VideoStream, Wireless Access points

Cisco does revolution, by creating a world’s first 802.11 n wireless access point which can create a self-healing, self-optimizing wireless network that intelligently avoid RF interference resulting in simplification of wireless operation and improvements in wireless operations.

With CleanAir, a Cisco-patented application-specific integrated circuit (ASIC) the Cisco 3500 Series APs can detects and identifies sources of wireless interference, then adjusts the APs to overcome them. According to Cisco, CleanAir can pick out up to 20 unique interference sources, including everything from microwave ovens and XBox controllers to video cameras and Bluetooth devices.

These innovative access points provide the highest-performance 802.11n connectivity for mission-critical mobility. By intelligently avoiding interference, the 3500 Series offers performance protection for 802.11n networks to help ensure reliable application delivery.

RF Excellence

Building on the Cisco Aironet heritage of RF excellence, the 3500 Series delivers industry-leading performance for secure and reliable wireless connections. Enterprise-class silicon and optimized radios deliver a robust mobility experience using Cisco M-Drive technology, which includes:

• ClientLink improves reliability and coverage for legacy clients.

• BandSelect improves 5-GHz client connections in mixed client environments.

• VideoStream uses multicast to improve rich-media applications.

All of these features help ensure the best possible end-user experience on the wireless network.

The Cisco 3500 Series APs are availbale in two models

3500i model with internal antennas for typical office deployments

3500e model with external antenna connectors and extended operating temperature for challenging environments

May 1, 2010  8:07 PM

Get WebEx on your Blackberry

Posted by: Yasir Irfan
Blackberry, BlackBerry App World., Blackberry version of Web Ex, Blackberry Web Ex, Cicso Systems, Cicso WebEx, Cisco News, Network technologies & trends, presentations and applications, WebEx, WebEx on your Blackberry


After iPhone now Web Ex is available with Blackberry. The newly released WebEx Meeting Center is now available via BlackBerry App World.

The Blackberry version of Web Ex offers following function.
• View presentations and applications.
• Start or join meetings quickly and easily.
• See who attends and enable others to present.
• Enjoy integrated audio.
• Start group and private chats.

The Web Ex app for black berry has most of the same features as the WebEx for an iPhone.

May 1, 2010  7:51 PM

A new vulnerability is affecting Share Point 2007

Posted by: Yasir Irfan
cross-site scripting vulnerability, Microsoft, Microsoft Office SharePoint Server 2007, Security, SharePoint Services 3.0


A new vulnerability is affecting Microsoft Office SharePoint Server 2007 has surfaced. While enterprises wait on a patch, there are actions they can take to mitigate the vulnerability.
- Microsoft has confirmed reports of a cross-site scripting vulnerability in SharePoint Server 2007 and SharePoint Services 3.0. According to Microsoft, the vulnerability could allow escalation of privilege (EoP) within the SharePoint site. . If an attacker successfully exploits the vulnerability, the person could run commands against the SharePoint server with the privileges of the compromised user.

“In the elevation of privilege scenario, an attacker could convince a user to click a specially crafted URL containing a script that would be run on the target SharePoint site,” Microsoft warned. “This URL could be in an e-mail message, on a Web site, or in an Instant Message conversation. Once the user clicks the specially crafted URL, the browser would run the script with the same privileges as the targeted user on the SharePoint site.”

Microsoft officials did not state when a security update will be ready to address the issue.

April 29, 2010  9:04 PM

Cisco and VMware to Accelerate Data Center Virtualization Opportunities for Channel Partners

Posted by: Yasir Irfan
Cisco Partner Summit, Cisco Press Release, Cisco Systems, Cisco Unified Computing, Network technologies & trends, VMware, VMware vSphere

According to a Cisco Press release at Cisco Partner Summit on 28th of April,2010 , Cisco Systems and VMware will expand their relationship with the launch of a comprehensive channel acceleration initiative.

Some of the supporting quotes are

·         Ralph Nimergood, vice president, Worldwide Partner Organization, Cisco:

“The Cisco and VMware relationship focuses on delivering solutions that help customers on their journey to building private clouds that deliver IT as a service.  The launch of this initiative will serve as a catalyst with our mutual channel partner community to capitalize and accelerate on the market transition towards data center virtualization and private clouds.”

·         Gary Green, vice president, Global Strategic Alliances, VMware:

“VMware vSphere™ and Cisco Unified Computing System comprise an innovative solution that helps customers accelerate their journey to the private cloud. This new initiative will help our mutual channel partners deliver solutions that enable faster time to value for customers while lowering costs.

Targeting mutual channel partners that are Cisco data center specialized and authorized to resell VMware solutions, the initiative includes a wide range of new benefits, including solutions training, solution bundles, financial incentives, funding for virtualization assessments, online demo labs, market enablement and financing.  The initiative will help solution providers derive greater value for their investment in Cisco-VMware capabilities by simplifying the delivery of a complete architecture with the industry-leading Cisco Unified Computing System and VMware vSphere™.  The integrated solution will reduce data center complexity, lower costs and enable a more flexible, agile IT service delivery model.

For more details do check this press release from Cisco Systems.

April 24, 2010  5:31 AM

Solarflare Achieves Low-Latency Network Performance Results in STAC Benchmarks With Cisco Catalyst 4900M and Cisco UCS C200 M1 Rack Server

Posted by: Yasir Irfan
10 Gigabit Ethernet, Cisco Catalyst® 4900M 10GbE Switch, Cisco UCS server, Cisco® UCS C200 M1 Rack Server, Informatica 29West Latency Busters® Messaging (LBM), latency, Network technologies & trends, Solarflare, Solarflare Achieves Low-Latency Network Performance, STAC Report™, STAC-M2 report


Solarflare Communications, the pioneer in 10 Gigabit Ethernet (10GbE) solutions, announced results of a multi-vendor test using Solarflare’s OpenOnload Application Accelerator middleware, Solarflare 10GbE dual-port SFP+ SFN5122F server adapters, Cisco Catalyst® 4900M 10GbE Switch, Cisco® UCS C200 M1 Rack Server and Informatica 29West Latency Busters® Messaging (LBM). Solarflare’s middleware solution contributed significantly to increasing the application-messaging rate, while maintaining low latency and bounded jitter, essential for financial firms utilizing high-frequency trading applications.

The vendors used the STAC-M2™ Benchmark to measure the messaging performance of the solution stack. STAC-M2 measures the ability of a solution to handle real-time market data in a variety of configurations. The multi-vendor testing achieved mean latencies as low as 16 microseconds with very small standard deviations of the latency (or jitter) of just one microsecond. The highest throughput achieved with one producer was 1.3 million messages per second, rising to 2.1 million messages per second with two Producers*. The test was audited by STAC® (The Securities Technology Analysis Center). The STAC Report™ is available at

“STAC-M2 Benchmarks provide valuable information to trading firms looking to implement the best performing solutions. The tests are rigorous and impose real-word challenges to ensure that products can handle many of the demands of today’s high-frequency applications. We are pleased that Solarflare, Cisco and Informatica participated in these tests.” Said Jack Gidding, Assocate Director at STAC.

For the STAC Benchmarks™, Solarflare’s SFN5122F server adapters were installed in the servers along with OpenOnload. Solarflare’s OpenOnload speeds up messaging and other types of applications, while reducing the processing work that the host server has to do. It not only reduces the application’s latency while increasing its performance, it also maintains complete compatibility with standard TCP/IP and Ethernet protocols. The vendors configured the multi-core Cisco UCS servers so that all interrupts and background processing tasks were run on a single core. OpenOnload enabled the application threads to run without contention with each other. This left all other cores in the Cisco UCS server free to run application code without any interruption, cross talk or congestion. This division of labor among the cores achieved by OpenOnload contributed significantly to the very low latency and low jitter of the total solution stack.

“We are excited to see a second STAC-M2 report published that demonstrates our products’ performance with other leading solutions used in financial firms today,” said Bruce Tolley, VP corporate and financial services marketing. “These results demonstrate how trading firms can elegantly combine Ethernet solutions available to gain a competitive advantage with their high frequency trading by decreasing latency.”

* Latency: Mean latency was 16 microseconds in each of the use cases where latency is a key end-user priority and messages are passed as opaque buffers, including STAC-M2.v1.0.BASELINE.LAT1, STAC-M2.v1.0.OVERLAP.LAT1, and STAC-M2.v1.0.DUALPROD.LAT1. Throughput: STAC-M2.v1.0.BASELINE.TPUT1 was 1.3 million messages per second. STAC-M2.v1.0.DUALPROD.TPUT1 was 2.1 million messages per second. Further details at

Source: Solarflare Communications, Inc.

April 23, 2010  6:29 AM

10 hottest IT certifications

Posted by: Yasir Irfan
CCNP, CCSA, CCSE, CISA, CISM, CWSP, economy, Foote Partners, GASE, GCIA, hot IT Certificates, IT Certifications, MCSE, VCP

IT certifications have always been popular among the IT professionals to a seek a right job or right jump, Now economy is showing some green signals, IT jobs too are gradually getting back along with the demand for IT certifications, which in recent times have become more technology –and vendor – specific.

Technology research firm Foote Partners recently shared IT certifications that could be considered “hot” in the coming months (these unranked certifications are a part of the company’s upcoming quarterly index on hot skills and certifications).  Microsoft and Cisco certifications also got good grades.


Here are the top 10 hottest IT certifications from the list.

Cisco Certified Network Professional (CCNP)

Certified Information Systems Auditor (CISA)

VMware Certified Professional (VCP)

GIAC Security Audit Essentials (GSAE)

Certified Information Security Manager (CISM)

Check Point Certified Security Expert (CCSE)

Check Point Certified Security Administrator (CCSA)

Microsoft Certified Systems Engineer (MCSE -Security)

Certified Wireless Security Professional (CWSP)

GIAC Certified Intrusion Analyst (GCIA)


April 21, 2010  11:45 AM

iPhone OS 4 supports Cisco SSL VPN

Posted by: Yasir Irfan
Cisco AnyConnect Secure Mobility client, Cisco SSL VPN, Cisco Systems, DTLS, iPhone OS 4, iPhone OS 4 supports Cisco SSL VPN, Network technologies & trends

According to Apple’s announcement last week, the upcoming iPhone OS 4 support the SSL VPN connectivity using the Cisco AnyConnect Secure Mobility client.

As we all know the Cisco AnyConnect Secure Mobility client uses the Datagram Transport Layer Security (DTLS) protocol. DTLS helps provide an optimized connection for latency-sensitive traffic, such as voice over IP (VoIP) and TCP-based application access.

Hence the Cisco AnyConnect Secure Mobility client delivers ubiquitous access to authenticated users, enabling increased productivity by providing “anytime access” to the network.  In addition, the client provides full tunnel connectivity while being versatile, lightweight, and user-friendly.  AnyConnect users can now have an in-office experience to virtually any application or resource from their iPhone without compromising device battery or performance.

According to Cisco once the iPhone OS 4 is released, they will be making an available app to enable AnyConnect connectivity.

April 21, 2010  5:53 AM

Share the Wealth Contest – don’t miss the oppurtunity!

Posted by: Yasir Irfan
Cisco Certification IT learning content, Cisco Community, Cisco Contest, Cisco Judges, Cisco Learning Network, Cisco Press Books, Flip video camcorder, Pearson Vue exam voucher, Share the Wealth Contest

Cisco is providing you an opportunity to share your knowledge with the Cisco Learning Network Community and win a Flip Video Camcorder. Cisco values your experience and knowledge,as they are important to the Cisco Learning Network Community. It’s very simple to participate in “Share the Wealth” contest. The contest closes on April 30, so do act now.

Pic Courtesy: Cisco Learning Network

Steps to Participate:

·         Step 1 – Register for the Cisco Learning Network. If you’re not already registered: click here.

·         Step 2 – Develop and submit a piece of original Cisco Certification IT learning content in any format (technical article or white paper, PowerPoint presentation, audio/video podcast) and for any certification track (Entry, Associate, Professional, Expert, and Specialist). Technical articles, white papers and PowerPoint presentations should be no longer than 10 pages in length. Podcasts should be no longer than 20 minutes. Formats accepted for podcasts: MP3, MP4, WAV, MOV. All submitted content must be in English. To submit content, click here.

·         Step 3 – Upload learning content: Within 24 to 48 hours after completing the online submission form, you will receive an email with instructions on how to upload your learning content to our FTP server.

·         Step 4 – Cisco judges will choose five (5) semi-finalists: One (1) from each of the certification categories (Entry, Associate, Professional, Expert, and Specialist). You will be contacted via email if you have been chosen or not as one of the five (5) semi-finalists.

Step 5 – Community votes to select Grand Prize winner from the five (5) semi-finalists.

If your content is selected as one of five semi-finalists, it will be voted upon by the Cisco learning community to determine the winner. The winner will take home the Flip Video camcorder. All semi-finalists will win a Cisco Press book and Pearson VUE exam voucher. Be recognized by your community and win a prize! [Learn More]

·         March 18 to April 30 – Contest open for submissions

·         May 3 to May 7 – Review of submissions by Cisco judges and selection of five (5)semi-finalists

·         May 10 – Announcement of the five (5) semi-finalists

·         May 11 to May 18 – Community voting to select the winner

May 19 – Announcement of Grand Prize winner

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