TCP – Tips and Case Studies. Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application.

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Presentation transcript:

TCP – Tips and Case Studies

Presenter – Chris Greer Packet Pioneer LLC Network Analyst - WCNA Training and Professional Services Network and application performance analysis

Why TCP? Important stuff uses it. Some problems “hide” at this layer. Key to isolating problem domain. Few take responsibility for it.

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

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

What if the problem is neither? PHYSICAL DATA LINK NETWORK TRANSPORT SESSION PRESENTATION APPLICATION

A TCP Window Problem Open TCP Window Problem.pcap

A Server Problem Busy Server.pcap

TCP Keep Alives These may look bad – but are they? Open Slow Web Application.pcap

MSS Issues WAAS

MSS Issues Inbound TCP MSS Change To 1432 WAAS

Thanks! Enjoy the rest of Sharkfest 2015!