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Non-TCP packets with IP headers will be transmitted by DUAL using the
PR_IP protocol format. Any TCP packets that are given to the
header compression scheme for compression will be transmitted using the
PR_CIP protocol format. This includes uncompressed packets, such as:
- TCP/IP packets which cannot be compressed, as they are the first packets
for a TCP connection,
- TCP/IP packets whose state has changed so much that the headers
cannot be compressed,
- TCP/IP packets for connections that have `fallen out' of the LRU
state table in the compressor, and
- retransmitted TCP/IP packets needed to be sent uncompressed to
resynchronise the uncompressor.
Therefore an implementation of DUAL with PR_CIP must also
implement PR_IP.