-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi,
the format draft version 13 says that if the UDP Length field is compressed then its value "is equal to the Payload Length from the IPv6 header, minus the length of any extension headers present between the IPv6 header and the UDP header." However, IMHO there cannot be any extension headers between the IPv6 header and the UDP header if the UDP header is HC2/HC_UDP compressed. The compressed UDP header can only be used if it follows immediately after the compressed IPv6 header. If there were any extension headers following the IPv6 header, the Next Header value (bits 5 and 6) in the HC1-compressed IPv6 header would not be 01 (UDP), the HC2 encoding (bit 7) could not be set, the UDP header could not be HC2/HC_UDP compressed at all and hence there would be no compressed UDP Length field. Is the wording in the draft a provisioning for the future where extension headers could possibly be included with a compressed UDP header or should it maybe mention that given the current format draft there cannot be any extension headers if the UDP header is compressed? Matus -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFGdwM443LQWDWf0QIRAqrGAJ9UTncaW+1Y1cONvI0HdG4EaakpOwCfbpZc 0g6rUVsqywJ+/Ua4vC91X9M= =r/uC -----END PGP SIGNATURE----- _______________________________________________ 6lowpan mailing list [email protected] https://www1.ietf.org/mailman/listinfo/6lowpan
