CSLIP

CSLIP: Unix Connection with IP Header Compression
This server type is seldom used for the
reason indicated in Chapter 24: SLIP (Serial Line Internet Protocol) is rarely used due to its sole
support for IP. Legacy Unix servers, however, might still require this option. CSLIP stands for
Compressed Serial Line Internet Protocol. This option supports only IP and does not support
software compression, encrypted passwords, or data compression.