Jose, Thanks a million for your e-mail. I will forward it to the plugtest-specific ML. Thomas
On Wed, Jul 1, 2015 at 9:29 AM, José Ángel Miranda <[email protected]> wrote: > We found some doubts when reading the DIO message sent by the DODAG Root > from the current GD version: > > *1. * The DIO message is encoded with the IPv6 in IPv6 tunneling header. > Is it necessary ? > > The minimal-10 draft at section 9.2 states: " ... In the case that the > packets formed at the LLN need to cross through intermediate routers, > these MUST obey to the IP in IP encapsulation requirement... " ; since DIO > messages do not cross any router, but are sent hop by hop by every RPL > routing node why do we need to encapsulate them with this additional header > and " waste " more than 30 bytes of payload in a low power application like > WSN ? > > *2*. The DIO Base byte number 5 ( G | 0 | MOP | Prf ) is seto to " 0xB8 > " ; this means G = 1 , MOP = 7 , Prf = 0 ( this bug has been already > detected by 6TiSCH ). > > The RPL Standard at section 6.3.1 defines as assigned modes of operation > only numbers 0 to 3, so MOP = 7 is not admitted by the standard, thus a > node that receives such DIO message will certainly discard it since this > mode of operation is a non-standard one. > > * 3*. The DIO message comes without any DIO Option and advertises a rank > of "0x0000" in bytes 3 and 4 of the DIO base. > > The RPL standard at section 8.2.2.2 says " ... A DODAG root MUST > advertise a Rank of ROOT_RANK ... " , and defines ROOT_RANK at point 17 as > "... This is the Rank for a DODAG root. ROOT_RANK has a value of > MinHopRankIncrease (as advertised by the DODAG root) ... " . The > minimal-10 draft at section 9.1.1 states: > > "... MinHopRankIncrease: the MinHopRankIncrease is set to the fixed > constant DEFAULT_MIN_HOP_rank_increment [RFC6550]. > DEFAULT_MIN_HOP_rank_increment has a value of 256. " > > Given that, shouldn't the rank of the DIO message be equal to > MinHopRankIncrease instead than zero ? Moreover, don't you find > convenient to insert the " DODAG configuration option" in the DIO > message, in order to let nodes know how the DODAG works and be configured > accordingly ? > > You can find attached a screenshot from the DR's DIO message reception. > > ------------------------------------------ > *Jose A. Miranda Calero* > > Embedded Software Engineer > > Kirale Technologies S.L. > Logroño - Spain > > tel: +34941578578 > > > > _______________________________________________ > 6tisch mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/6tisch > >
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