TCP

Laura Chappell

It's TCP/IP's Birthday!

In 1974, the world was focused on the Rumble in the Jungle and Richard Nixon's resignation in disgrace. In that same year (in May), Vint...

Laura Chappell

TCP Sequence Number in ACK Scans

During a recent class, I received a question related to ACK scans. "What Sequence Number would you see on the response to an ACK scan?"...

Laura Chappell

Detect Suspicious Traffic with "TCP Conversation Completeness"

In my last blog entry, I explained how Wireshark calculates TCP Conversation Completeness based on the TCP flags and whether data is seen...

Laura Chappell

Using Wireshark's TCP Conversation Completeness

Wireshark added the TCP conversation completeness measurement to identify elements contained in captured TCP conversations. In this post,...

Laura Chappell

Virtual Event Hosting and Video Streaming Troubleshooting

Updated: September 27th, 2020 In March, thousands of IT professionals and students joined us for CORE-IT, a free...

Laura Chappell

The "Legit" DDoS on PG&E

See the legitimate DDoS on PG&Es site after they announced that power would be shut off to upwards of 800,000 customers in October 2019.

Laura Chappell

Packet Challenge: Look it Up in the Dictionary [100119]

Packet Challenge: Look it up in the Dictionary - download the trace file and test your skills on this Packet Challenge.

Laura Chappell

Troubleshooting SYNs of the Network

After a painfully slow LinkedIn launch, I grabbed the traffic and saw some definite issues in the TCP handshake processes.

Laura Chappell

Customize the Wireshark Expert

Wireshark is a piece of clay. In this blog, Laura teaches you how to customize the Expert Information - an often overlooked feature.

Laura Chappell

Spurious Retransmissions - a Concern?

Should you be concerned about Spurious Retransmissions in a trace file? What triggers these indications and what should you do?

Laura Chappell

Free TCP Analysis Poster

The Chappell University team will be joining our Partner in Technology Education, Profitap, at Stand 3233 at RSA 2019 in San Francisco!...