draft-ietf-6man-impatient-nud-03.txt   draft-ietf-6man-impatient-nud-04.txt 
6MAN WG E. Nordmark 6MAN WG E. Nordmark
Internet-Draft Cisco Systems, Inc. Internet-Draft Cisco Systems, Inc.
Updates: 4861 (if approved) I. Gashinsky Updates: 4861 (if approved) I. Gashinsky
Intended status: Standards Track Yahoo! Intended status: Standards Track Yahoo!
Expires: April 4, 2013 Oct 2012 Expires: April 4, 2013 Oct 2012
Neighbor Unreachability Detection is too impatient Neighbor Unreachability Detection is too impatient
draft-ietf-6man-impatient-nud-03.txt draft-ietf-6man-impatient-nud-04.txt
Abstract Abstract
IPv6 Neighbor Discovery includes Neighbor Unreachability Detection. IPv6 Neighbor Discovery includes Neighbor Unreachability Detection.
That function is very useful when a host has an alternative, for That function is very useful when a host has an alternative, for
instance multiple default routers, since it allows the host to switch instance multiple default routers, since it allows the host to switch
to the alternative in short time. This time is 3 seconds after the to the alternative in short time. This time is 3 seconds after the
node starts probing by default. However, if there are no node starts probing by default. However, if there are no
alternatives, this is far too impatient. This document specifies alternatives, this is far too impatient. This document specifies
relaxed rules for Neighbor Discovery retransmissions that allows an relaxed rules for Neighbor Discovery retransmissions that allows an
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configure are BACKOFF_MULTIPLE, MAX_UNICAST_SOLICIT and configure are BACKOFF_MULTIPLE, MAX_UNICAST_SOLICIT and
MAX_MULTICAST_SOLICIT. MAX_MULTICAST_SOLICIT.
It would be useful to have a maximum value for It would be useful to have a maximum value for
($BACKOFF_MULTIPLE^$solicit_attempt_num)*$RetransTimer so that the ($BACKOFF_MULTIPLE^$solicit_attempt_num)*$RetransTimer so that the
retransmissions are not too far apart. A value 60 seconds is retransmissions are not too far apart. A value 60 seconds is
consistent with DHCP. consistent with DHCP.
5. Acknowledgements 5. Acknowledgements
The comments from Thomas Narten, Philip Homburg, Joel Jaeggli, and The comments from Thomas Narten, Philip Homburg, Joel Jaeggli, Hemant
Hemant Singh have helped improve this draft. Singh, and Tina Tsou have helped improve this draft.
6. Security Considerations 6. Security Considerations
Relaxing the retransmission behavior for NUD is believed to have no Relaxing the retransmission behavior for NUD is believed to have no
impact on security. In particular, it doesn't impact the application impact on security. In particular, it doesn't impact the application
Secure Neighbor Discovery [RFC3971]. Secure Neighbor Discovery [RFC3971].
7. IANA Considerations 7. IANA Considerations
This are no IANA considerations for this document. This are no IANA considerations for this document.
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