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Watch the full OnDemand Webcast: http://bit.ly/bandwidthmanagement Bandwidth is cheap, and getting cheaper. That’s probably why the solution to most network problems today is to just throw more bandwidth at it. And although this may alleviate the symptoms of the problem de jour, it doesn’t address the root cause. Bandwidth-related network issues are often an early warning sign of brewing problems, or they can indicate a problem that needs immediate attention, like an infected client reaching out to everyone else on the network. Bandwidth management and control spans several factors, with the most important being breadth and time. For large enterprise networks, you need to take a top-down approach, assessing overall bandwidth usage at the geographical level first, then drilling into specific areas when anomalies occur. Monitoring and management needs to occur in real time, with the ability to quickly transition into troubleshooting mode, but also needs to support long-term statistical storage for historical and trending analysis. Without a baseline of past behavior, how do you know if there’s a problem now? With effective bandwidth management and control, you’ll be the hero. Please join us to see how WildPackets can help you meet the bandwidth management challenge while simplifying your network monitoring and analysis infrastructure. You’ll know exactly when more bandwidth is really needed, and you’ll be able to justify it with detailed reports. But you’ll also know when bandwidth usage deviates from normal, indicating a potentially dangerous condition on the network that needs immediate analysis, and you’ll have the tools in place to instantly begin the root cause analysis. In this web seminar, we will cover: - The basics of bandwidth management and monitoring - Key requirements for a complete bandwidth management and monitoring solution - The importance of establishing network performance baselines What you will learn: - How to identify network problems masked as bandwidth issues - How to use real-time and historical reporting to justify bandwidth upgrades - How to employ a single solution that spans simple reporting to detailed, root-cause analysis
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www.wildpackets.com © WildPackets, Inc.
Bandwidth Management
and Control
“Who Cares? BW Is Cheap.”
Show us your tweets! Use today’s webinar hashtag:
#wp_bandwidth with any questions, comments, or feedback.
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Jim MacLeod
Product Manager
WildPackets
Follow me @shewfig
Jay Botelho
Director, Product Management
WildPackets
Follow me @jaybotelho
© WildPackets, Inc.
The Problem
• Bandwidth limitations
• Slow response
• Angry users
• Angry customers
© WildPackets, Inc.
The Choice
• Blindly throw money at it ‒ Demand increases to fill supply
‒ Bandwidth is not always cheap
• Modify the demand! ‒ Control the traffic
‒ Allow access that enforces your priorities
© WildPackets, Inc.
The Process
• Audit
• Analyze
• Modify
• Measure
© WildPackets, Inc.
Audit
• Understand your business needs
• Businesses run on data
• Data is carried by networks
• Your organization needs enough bandwidth
© WildPackets, Inc.
Analyze
• Check what's on your network now
• Decide: ‒ What to protect
‒ What to block
‒ What to allow
© WildPackets, Inc.
Modify
• Make policy changes
• Start small ‒ Defined scope
‒ Measurable results
© WildPackets, Inc.
Measure
• Evaluate the change
• Are the controls working?
• Make the change work before adding another change
© WildPackets, Inc.
Repeat in Measurable Steps
• You wouldn’t: ‒ Re-number without planning
‒ Replace your firewall carelessly
• QoS, blocking, and bandwidth changes: ‒ Change how traffic flows
‒ Best done in discrete, measurable steps
• The goal: ‒ Assure the business
‒ Reduce the cost
© WildPackets, Inc.
Auditing: What Do You Need?
• Business-critical traffic ‒ If it went down, your business would stop
‒ SaaS, Inter-site WAN, VPN, email ‒ This is the traffic that needs to be QoS protected
• Business-enabling traffic ‒ If it went down, some employees would be inconvenienced ‒ Research sites, social media, industry-specific
• “Harmless” traffic ‒ If it went down, your business would not be affected ‒ Personal email, sports scores, etc.
• “Toxic” traffic ‒ Traffic that hurts your business ‒ Bandwidth hogs, illegal downloads, etc.
© WildPackets, Inc.
Analyzing: Find the Pain Points
• WAN ‒ Connection to the Internet
‒ Higher cost than LAN
‒ Lower bandwidth than LAN
• Equipment ‒ Is your firewall slowing you down?
‒ Are your routers dropping packets?
• Wi-Fi ‒ Shared medium:
‒ Subject to interference
‒ One node can affect everyone
© WildPackets, Inc.
Analyzing the WAN
• Start with total usage ‒ What does your WAN router report for link usage?
‒ Is your traffic less than your link bandwidth?
‒ If so, the WAN link isn’t at fault, adding more speed won’t help.
• Packet sniff outside the firewall ‒ Between the firewall and the WAN router
‒ Is there lots of inbound traffic that should be blocked?
‒ Can your ISP block upstream?
© WildPackets, Inc.
Analyzing the Equipment
• Packet sniff on both sides ‒ Are packets being dropped?
‒ Do retransmissions show up on the inside, but not the outside?
• Similar to “Application versus Network” analysis ‒ Differential analysis of in/out shows:
• Drops
• Latency
• Useful for security purposes ‒ Is traffic getting through that shouldn’t?
• Things to test ‒ Firewalls, routers, Wi-Fi APs (Wireless vs Wired sides)
‒ Anywhere the network seems “slow”
© WildPackets, Inc.
Analyzing Wi-Fi
• 802.11b/g/n all share the same spectrum ‒ Slower users slow everyone down
• One 802.11b user makes everyone else wait
• Broadcasts/Multicasts go out at the slowest speed!
‒ Poor signal causes Wi-Fi retransmissions • A user with bad signal strength will retransmit frequently
• Slows everyone else down
‒ 2.4GHz is “noisy” • Portable phones, microwave ovens, etc.
• Move to 5GHz if you can (802.11a/n)
• BYOD creates lots of multicasts ‒ Device discovery uses mDNS – transmitted everywhere!
© WildPackets, Inc.
Modify Demand: the Tools
• QoS-like traffic prioritization and queuing ‒ Commonly tied to ACLs for specific filtering
• Types of controls: ‒ Protected/Assured: guaranteed bandwidth
‒ Limited: artificially restricted, slowed down
• Scope of control: ‒ Broad: shared pool for all traffic of that type
‒ Tight: per-user or per-stream restriction
• Recommendation: ‒ Protect your Critical traffic first
‒ Limit your Harmless traffic (optional) • It’s easier to protect known traffic than to block unknown traffic
‒ Block Toxic traffic (recommended)
© WildPackets, Inc.
Measuring Success
• Repeat your Analysis to test your changes ‒ Is it working?
‒ Are there unintended results?
• QoS isn’t easy ‒ Most sites don’t get it right the first time
‒ Don’t go overboard, it can grow to fill your time
© WildPackets, Inc.
Repeat Periodically
• Make changes until the current crisis passes ‒ Modify & Measure in small changes
• Plan for the future ‒ Institute ongoing monitoring
‒ Makes future Analysis easier
‒ Lets you predict when more bandwidth will be needed
• Audit
• Analyze
• Modify
• Measure
• Repeat Periodically
www.wildpackets.com © WildPackets, Inc.
Live Demo
Show us your tweets! Use today’s webinar hashtag:
#wp_bandwidth with any questions, comments, or feedback.
Follow us @wildpackets
Show us your tweets! Use today’s webinar hashtag:
#wp_bandwidth with any questions, comments, or feedback.
Follow us @wildpackets
www.wildpackets.com © WildPackets, Inc.
Q&A
Show us your tweets! Use today’s webinar hashtag:
#wp_bandwidth with any questions, comments, or feedback.
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