SSH Tectia 
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    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.

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