[Contents] [Index]

About This Document >>     Installing SSH Tectia Server for IBM z/OS >>     Using SSH Tectia Server for IBM z/OS >>     Configuring the Server >>         Configuration Files >>         Subconfigurations >>         Ciphers and MACs         Compression         Configuring Root Logins         Restricting User Logins         Subsystems         Auditing >>         Securing the Server >>     Configuring the Client >>     Authentication >>     Troubleshooting SSH Tectia Server for IBM z/OS >>     Examples of Use >>     Man Pages >>     Log Messages >>

Compression

SSH Tectia Server for IBM z/OS uses GNU ZLIB (LZ77) for compression. The zlib compression is described in RFC 1950 and in RFC 1951.

By default, compression is disabled. Compression can be enabled in the ssh2_config file:

Compression yes

Alternatively, compression can be enabled on the command line:

$ ssh2 +C username@remote

Compression is worth using if your connection is slow (for example, a modem connection). The efficiency of the compression depends on the type of the file, and varies widely. It is close to 0% for already compressed files like zip and often 50% or even more for text files.