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Printable Version: RFC3095.PDF
RFC 3095 Robust Header Compression July 2001
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Whether the UDP Checksum field is present or not is controlled by the
value of the UDP Checksum in the context. If nonzero, the UDP
Checksum is enabled and sent along with each packet. If zero, the
UDP Checksum is disabled and not sent. Should hdr(UDP Checksum) be
nonzero when context(UDP Checksum) is zero, the header cannot be
compressed. It must be sent uncompressed or the context
reinitialized using an IR packet. Context(UDP Checksum) is updated
only by IR or IR-DYN headers, never by UDP checksums sent in headers
of type 2, 1, or 0.
When an IPv4 header is present in the static context, for which the
corresponding RND flag has not been established to be 1, the packet
types R-1 and UO-1 MUST NOT be used.
When no IPv4 header is present in the static context, or the RND
flags for all IPv4 headers in the context have been established to be
1, the packet types R-1-ID, R-1-TS, UO-1-ID, and UO-1-TS MUST NOT be
used.
While in the transient state in which an RND flag is being
established, the packet types R-1-ID, R-1-TS, UO-1-ID, and UO-1-TS
MUST NOT be used. This implies that the RND flag(s) of the Extension
3 may have to be inspected before the format of a base header
carrying an Extension 3 can be determined.
5.7.1. Packet type 0: UO-0, R-0, R-0-CRC
Packet type 0 is indicated by the first bit being 0:
R-0
0 1 2 3 4 5 6 7
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| 0 0 | SN |
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Updating properties: R-0 packets do not update any part of the
context.
Bormann, et al. Standards Track [Page 78]