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News
Big Traffic Boondoggle
7/24/12
Cisco Systems Inc. seems perfectly placed to benefit from an expected explosion in service provider spending.
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Cisco Tops in Security SaaS Segment
7/24/12

Cisco To Support 802.11ac in the Enterprise
6/28/12

Cisco (Once Again) Tops in Data Center Networking; UCS Rising
6/28/12

UCS Makes Strong Gains in Data Center Market
6/23/12

Cisco Makes Most of Carrier Market Doldrums
5/31/12

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Out-of-Band Management:
Marketplace Assessment

Out-Of-Band (OOB) Management, focused on achieving strong ROI (Return On Investment) through centralized control and repair of local and remote IT infrastructure devices, has been a Out-of-Band Management: Marketplace Assessmentgrowing niche market for many years. This report assesses the OOB market and the drivers that are taking it beyond its previous isolation and into the IT management industry's mainstream.

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Pop Quiz
Cisco Exam #642-871: ARCH Exam (MeasureUp, set 2)
Work on your understanding of network design and technologies for the CCDP with these 10 sample questions from MeasureUp. (8/21/06)
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Feature Article
IT Training on the Cheap
by Brien Posey
Keep your IT knowledge up-to-date without breaking the bank with these simple tips. (January 2010)
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Exam Review
Securing Networks with PIX and ASA (SNPA 642-522)
by Andy Barkl
Cisco's newest version of the PIX exam tests your knowledge of AAA, failover, VPNs, setup, configuration and management of the PIX Firewall. (June 2006)
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International Cisco® Salaries
International Cisco Salaies
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Salary Surveys
2006-2007 TCPmag.com Internetworking Salary Survey
2006-2007 TCPmag.com Internetworking Salary SurveySalaries are up -- way up! -- across the board for those of you holding Cisco certification titles, with both starting salaries and top-tier credentials bringing in significantly more than ever before.

Tech Library Webcasts

Tech Library [on MCPmag.com]

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Redmond

Cover Story: IE8: Behind the 8 Ball

Tech-Ed: Let's (Third) Party!

A Secure Leap into the Cloud

Windows Mobile's New Moves

SQL Speed Secrets

PlateSpin Forge: DR in a Box

Embotics: Free VM Discovery

Barney's Rubble: The YouTube Mess

Never Again: When IT Meets Legal

Foley on Microsoft: For Microsoft, 'Open' Is the Hardest Word

Security Advisor: AppLocker Reins in Applications

Mr. Roboto: Group Therapy

Q & A
Video Killed the Data Stream
by Scott Morris

7/21/09

Scott,

We've run into a network issue. I work for a company that has software to manage and monitor digital video cameras. We have an installation in Mexico where the network is using wireless to send video back to the main building. The municipality there doesn't want to allow us to see their network configuration since they are managing it, but I'm stumped as to what might cause this.

I'm going to try and simplify the problem instead of loading up with background info. When we ping a camera, we have consistent 4-8 ms ping times. When we look at the video, however, we have virtually no frames coming in. I can see data coming in to the server using a packet sniffer, but it must be incomplete data as the frames are not shown. The cameras are set for a constant bit rate of 1,024 kbps using MPEG-4 TCP, but the data I see varies from 400-1,000 kbps. It is clear there's something blocking the data or at least corrupting it, but my confusion comes in when we are getting good, consistent pings.

For me, it seems like I'm missing a piece of information somewhere. I don't have my CCNA yet (I'm studying now), but I believe someone can define different routes for ICMP packets than TCP packets if they wanted to. Do you have an idea of what we can check? Or maybe some extra troubleshooting tips we can do if we are able to access some of the network devices? Or maybe there's something I can see using the "tcpdump" utility on the Linux server.

-- Aaron Read... read answer

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Cisco® Certifications
read... Cisco Certified Design Associate (CCDA)
read... Cisco Certified Design Professional (CCDP)
read... Cisco Certified Internetwork Expert (CCIE)
read... Cisco Certified Internetwork Professional (CCIP)
read... Cisco Certified Network Associate (CCNA)
read... Cisco Certified Network Professional (CCNP)
read... Cisco Certified Security Professional (CCSP)
read... Cisco Qualified Specialist (CQS)
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