Chapter 18. OpenSSH: Secure Network Communication

18. OpenSSH: Secure Network Communication

IN THIS CHAPTER

About OpenSSH	580
OpenSSH Clients	583
JumpStart: Using ssh and scp	583
sshd: OpenSSH Server	591
JumpStart: Starting the sshd Daemon	591
Authorized Keys: Automatic Login	592
Troubleshooting	595
Tunneling/Port Forwarding	596

OpenSSH is a suite of secure network connectivity tools that replaces telnet, rcp, rsh/rshd, rlogin/rlogind, and ftp/ftpd. Unlike the tools it replaces, OpenSSH tools encrypt all traffic, including passwords. In this way they thwart malicious users who would eavesdrop, hijack connections, and steal passwords.

This chapter covers the following OpenSSH tools:

• scp Copies files to/from another system

• sftp Copies files to/from other systems (a secure replacement for ftp)

• ssh Runs a command on or logs in on another system

• sshd The OpenSSH daemon (runs on the server)

• ssh-keygen Creates RSA or DSA host/user authentication keys