Re: [6lowpan] "Advertize on Behalf" flag in ARO
Erik Nordmark <nordmark@acm.org> Tue, 29 March 2011 11:11 UTC
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Date: Tue, 29 Mar 2011 04:13:30 -0700
From: Erik Nordmark <nordmark@acm.org>
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To: Mukul Goyal <mukul@uwm.edu>
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Cc: 6lowpan <6lowpan@ietf.org>
Subject: Re: [6lowpan] "Advertize on Behalf" flag in ARO
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On 3/3/11 5:07 AM, Mukul Goyal wrote: > Hi all > > Recently Anders pointed out the need for the "Advertize on Behalf" > flag in an Address Registration Option (ARO). > > We would not have needed this flag if only a host could send a > unicast NS containing an ARO. However, the way I read Section 6.5.5 > in nd-15, a 6lowpan router (6LR) can also send a unicast NS to > another 6lowpan router. This means that a registered neighbor cache > entry (NCE) in a 6LR could refer to either a host or another 6LR. So, > how does a 6LR know that a registered NCE belongs to an attached host > and it should advertize reachability to this host in the routing > protocol, such as RPL, it is running? > > The proposed flag will solve this problem. A host would set > "Advertize on behalf" flag when it sends an ARO inside a unicast NS > message, whereas a 6LR wont. > > I was wondering if ND authors could comment on this. I didn't see anybody else comment, so let me try. I don't know what assumptions RPL makes in particular, but if we are talking about a general case of a routing protocol, I don't see why there would be a need to tell a difference between a host sending an ARO and a router (which might be initializing and haven't yet enabled routing and forwarding) sending an ARO. In both cases I'd assume that the unicast address that is registered is something that should be reachable, hence it makes sense advertising reachability to that address. If this isn't the case, then a routing protocol would typically find out about its neighboring routers IP addresses, and from that it can decide to treat those IP addresses differently than the addresses assigned to hosts. Erik
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Mukul Goyal
- [6lowpan] Working Group Last call for draft-ietf-… Carsten Bormann
- Re: [6lowpan] Working Group Last call for draft-i… Don Sturek
- Re: [6lowpan] Working Group Last call for draft-i… Pascal Thubert (pthubert)
- [6lowpan] -nd-15: DAD requirement seems too strict Anders Brandt
- [6lowpan] -nd-15: Joining the all-nodes multicast… Anders Brandt
- [6lowpan] -nd-15: Battery host support seems to b… Anders Brandt
- [6lowpan] -nd-15: Purpose of SLLA slightly unclear Anders Brandt
- [6lowpan] 6lowPAN HC in context of draft-thubert-… Anders Brandt
- Re: [6lowpan] -nd-15: Joining the all-nodes multi… Colin O'Flynn
- Re: [6lowpan] -nd-15: Joining the all-nodes multi… Anders Brandt
- Re: [6lowpan] -nd-15: DAD requirement seems too s… Colin O'Flynn
- Re: [6lowpan] -nd-15: DAD requirement seems too s… Anders Brandt
- Re: [6lowpan] -nd-15: Battery host support seems … Mukul Goyal
- Re: [6lowpan] Working Group Last call for draft-i… Dijk, Esko
- [6lowpan] "Advertize on Behalf" flag in ARO Mukul Goyal
- Re: [6lowpan] Working Group Last call for draft-i… Mathieu Goessens
- Re: [6lowpan] Working Group Last call for draft-i… Noriyuki SATO
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Mukul Goyal
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Erik Nordmark
- Re: [6lowpan] -nd-15: Joining the all-nodes multi… Erik Nordmark
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Dijk, Esko
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Carsten Bormann
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Pascal Thubert (pthubert)
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Carsten Bormann
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Mukul Goyal
- Re: [6lowpan] -nd-15: Joining the all-nodes multi… Erik Nordmark
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Anders Brandt
- [6lowpan] How to find the mailbox? (related to "A… Anders Brandt
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Dijk, Esko
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Pascal Thubert (pthubert)
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Pascal Thubert (pthubert)
- Re: [6lowpan] How to find the mailbox? (related t… Richard Kelsey
- Re: [6lowpan] How to find the mailbox? (related t… Jonathan Hui
- Re: [6lowpan] How to find the mailbox? (related t… Pascal Thubert (pthubert)
- Re: [6lowpan] How to find the mailbox? (related t… Noriyuki SATO
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Erik Nordmark
- Re: [6lowpan] "Advertize on Behalf" flag in ARO Erik Nordmark