CSLIP only compresses the header data of a packet and has no effect on its payload and is therefore fundamentally different from the data compression of a modem. The method reduces the TCP / IP header size from 40 bytes to seven bytes.
CSLIP was developed to accelerate TCP / IP streams over narrowband connections, such as those found in the classic telephone network. Delta compression is used to transmit only the differences between the changing fields of successive packets and thereby reduce the overhead to significantly fewer bits. The error correction takes place after decompression via the error detection contained in TCP. CSLIP does not support UDP , but can only compress TCP / IP data flows, since only a small amount of UDP data was exchanged at the time the protocol was designed. In today's use, standards such as IPHC , CRTP or ROHC have become established.
- The concept of robust header compression, ROHC (PDF; 399 kB)