TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA...
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Transcript of TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA...
![Page 1: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/1.jpg)
TCP – Tips and Case Studies
![Page 2: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/2.jpg)
Presenter – Chris Greer
Packet Pioneer LLCNetwork Analyst - WCNA
Training and Professional ServicesNetwork and application performance analysiswww.lovemytool.comwww.brighttalk.com
![Page 3: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/3.jpg)
Why TCP?
Important stuff uses it.Some problems “hide” at this layer.Key to isolating problem domain.
Few take responsibilityfor it.
![Page 4: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/4.jpg)
• Network engineers check network interfaces, utilization levels, link errors and the wireless environment
• They want to prove it’s not the network.
PHYSICAL
DATA LINK
NETWORK
TRANSPORT
SESSION
PRESENTATION
APPLICATION
When a problem strikes
![Page 5: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/5.jpg)
When a problem strikes• Server and Application support people may check
error logs and server resources to see if the issue is theirs.
PHYSICAL
DATA LINK
NETWORK
TRANSPORT
SESSION
PRESENTATION
APPLICATION
![Page 6: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/6.jpg)
What if the problem is neither?
PHYSICAL
DATA LINK
NETWORK
TRANSPORT
SESSION
PRESENTATION
APPLICATION
![Page 7: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/7.jpg)
A TCP Window Problem
Open TCP Window Problem.pcap
![Page 8: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/8.jpg)
A Server Problem
Busy Server.pcap
![Page 9: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/9.jpg)
TCP Keep Alives
These may look bad – but are they? Open Slow Web Application.pcap
![Page 10: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/10.jpg)
MSS Issues
WAAS
![Page 11: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/11.jpg)
MSS Issues
Inbound TCP MSS ChangeTo 1432
WAAS
![Page 12: TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.](https://reader035.fdocuments.us/reader035/viewer/2022070411/56649f585503460f94c7db58/html5/thumbnails/12.jpg)
Thanks!
Enjoy the rest of Sharkfest 2015!