What is TCP SYN, ACK, FIN, handshake, teardown, and connection states?

Solution Verified - Updated -

Issue

  • What is TCP handshake, teardown, and connection states?
  • What are SYN, ACK, FIN in TCP connections?
  • In a TCP connection, which is the "client" and which is the "server"?
  • In a TCP connection, which side decides to close the connection first?

Environment

  • Red Hat Enterprise Linux
  • TCP/IP networking

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.