6lowpan nd optimization draft update
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Samita Chakrabarti [email protected] Erik Nordmark [email protected] IETF 69, 2007 draft-chakrabarti-6lowpan-ipv6-nd-03.txt. 6lowpan ND Optimization draft Update. Document History. The draft has been around since 2006 Several modifications based on wg comments

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6lowpan nd optimization draft update

Samita Chakrabarti

[email protected]

Erik Nordmark

[email protected]

IETF 69, 2007


6lowpan ND Optimization draft Update
document history
Document History
  • The draft has been around since 2006
  • Several modifications based on wg comments
  • Several presentations were made at the IETF working group meetings.
  • Version 03 is the latest
6lowpan ipv6 nd background
6Lowpan IPv6 ND Background
  • The solution handles prefix assignment and assumes one IPv6 router per 6lowpan network
  • Main Goals for optimization
    • Reduce or avoid DAD in 6lowpan network
    • Minimize multicast messages in RA, RS, NS and reduce un-needed unicast messages (NUD)‏
  • Captures basic 6lowpan network topologies and components based on interim wg comments
  • Many optimizations in this solution are applicable to non-multicast or non-broadcast network in general

Simple Star Topology

  • Assume IP link (~subnet) has one PAN coordinator
  • Assume one 6lowpan is one PAN ID
  • Assume the coordinator\'s unicast address is known from joining the PAN

L2 Mesh Topology Support

  • Assume one PAN coordinator per 6lowpan link
  • Assume each coordinator has a parent coordinator
  • Allows a unicast-only path to PAN coordinator
    • Can send packets to “all-routers” MC using this
recent changes
Recent Changes
  • Added text on Security section
  • The threat level of a 6lowpan IPv6 router is a bit higher because the end-nodes are battery powered.
  • A need for authenticated RA and NA: IPv6 router is the central point for address resolution.
  • Due to reduced processing power of the end-nodes, it is assumed that SEND protocol may not be directly applicable in 6lowpan ND. For example, RSA keys are too large for such small devices. Perhaps ECC instead of RSA algorithm.
  • Senders of neighbor solicitations should use SEND nonce option to match the response.
  • Limited 6lowpan ND security along with applied 802.15.4 level security may be sufficient in most situations
bootstrapping information in this draft
Bootstrapping Information in this draft?

Bootstrapping requirements

  • Assignment of IPv6 prefix
  • Finding out IPv6 router, co-ordinator’s L2 addresses
  • Finding out 6lowpan service information?
  • Any mechanism for access key and subsequent key derivation for secure ND and data transfer
  • Anything else?
next revision
Next Revision

To Do:

Handle short addresses ?

Handling bootstrapping information?

More investigation on secure 6lowpan ND ?

next step
Next Step

Should this draft be published as a working group item ?

Should this draft be written as a generic ND solution for non-broadcast and non-multicast network with an addendum for 6lowpan networks?