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Currently, the DIO options `dodag conf` and `prefix info` are off by two bytes in their `length` field. The RFC states, that the length field should not include the option `type` field and the `length` field (two bytes). For Prefix Info Option: Option Length: 30 (RFC 6550, P.61) For Dodag Conf Option: Option Length: 14 (RFC 6550, P.52) Wireshark complains about DIOs as malformed packets, otherwise. Can be reproduced by running the rpl_udp example and logging the DIOs via wireshark.