SSH Tectia 
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    About This Document >>
    Installing SSH Tectia Server for IBM z/OS >>
    Getting Started with SSH Tectia Server for IBM z/OS >>
    Configuring the Server >>
    Configuring the Client >>
        Client Configuration Files>>
        Ciphers and MACs
        Compression
        Securing the Client >>
        Default ssh2_config Configuration File
    Authentication >>
    Transferring Files >>
    Tunneling >>
    Troubleshooting SSH Tectia Server for IBM z/OS >>
    Advanced Information >>
    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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