Le 21 sept. 2010 à 14:08, Pascal Thubert (pthubert) a écrit : > Hi Rémi: > > It would not. > > We'll be very glad that 6LoWPAN compresses RPL optimally. But RPL being layer > 2 agnostic cannot depend on 6LoWPAN. > Header and IP in IP insertion is problematic on any network,
Couldn't the additional header start with e.g. a 0xF so that it can be distinguished from an IPvX header. (These 4 bits, plus the 20 that would be sufficient if FLs were to be used, would make a nice 3 octets.) It would then be layer-2 agnostic. > be it for the MTU issues only. Why? Isn't each traversed link authorized to have its link MTU? Cheers, RD > > The FL for RPL discussion illustrates that there can be multiple valuable > usages of the field by the network. > It mostly shows that tying the usage to local balancing only is probably > short sighted. > > Cheers, > > Pascal > >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On Behalf Of Rémi >> Després >> Sent: Saturday, September 18, 2010 4:53 PM >> To: JP Vasseur >> Cc: IPv6 WG; ROLL WG >> Subject: Re: [Roll] Flow Label: 12 bits mutable and 8 bits immutable >> >> >> Le 18 sept. 2010 à 02:22, JP Vasseur a écrit : >>> On Sep 15, 2010, at 8:51 AM, Carsten Bormann wrote: >>> ... >>>> >>>> However, it would be pretty easy to put something in 6lowpan to carry those >> 3 bytes. >>>> (Consider it an advanced form of header compression for the 48-byte >>>> IP-in-IP thing, if you don't like the sub-IP thinking.) Consult >> http://tools.ietf.org/html/draft-bormann-6lowpan-ext-hdr-00 for a sample base >> design. >>>> Such a simple extension may actually be a preferable way to carry ROLL in >> 6lowpan. >>> >>> "preferable" in which sense ? >> >> At least, IMHO, in that it eliminates the motivation to interfere with the >> current >> discussion on improving flow-label utilization. >> >> Regards, >> RD >> >> >> _______________________________________________ >> Roll mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/roll -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
