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More comments on UIP_CONF_ND6_AUTOFILL_NBR_CACHE

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This commit is contained in:
Simon Duquennoy 2017-06-19 09:55:22 +02:00
parent 0d0e065456
commit 2031edb607
2 changed files with 10 additions and 6 deletions
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12
core/contiki-default-conf.h
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@ -170,8 +170,8 @@
#define UIP_CONF_ND6_SEND_RA (NETSTACK_CONF_WITH_IPV6 && !UIP_CONF_IPV6_RPL)
#endif /* UIP_CONF_ND6_SEND_RA */
/* UIP_CONF_ND6_SEND_NS enables standard IPv6 Neighbor Discovery Protocol.
We enable it by default when IPv6 is used without RPL.
/* UIP_CONF_ND6_SEND_NS enables standard IPv6 Neighbor Discovery Protocol
(RFC 4861). We enable it by default when IPv6 is used without RPL.
With RPL, the neighbor cache (link-local IPv6 <-> MAC address mapping)
is fed whenever receiving DIO. This is often sufficient
for RPL routing, i.e. to send to the preferred parent or any child.
@ -179,7 +179,7 @@
we never receive any DIO from them. This may happen if the link from the
neighbor to us is weak, if DIO transmissions are suppressed (Trickle
timer) or if the neighbor chooses not to transmit DIOs because it is
a leaf node or for any reason.*/
a leaf node or for any reason. */
#ifndef UIP_CONF_ND6_SEND_NS
#define UIP_CONF_ND6_SEND_NS (NETSTACK_CONF_WITH_IPV6 && !UIP_CONF_IPV6_RPL)
#endif /* UIP_CONF_ND6_SEND_NS */
@ -187,8 +187,10 @@
enable UIP_CONF_ND6_AUTOFILL_NBR_CACHE. When a node does not the link-layer
address of a neighbor, it will infer it from the link-local IPv6, assuming
the node used autoconfiguration. Note that RPL uses its own freshness
mechanism to select whether neighbors are sitll usable as a parent
or not, regardless of the neighbor cache. */
mechanism to select whether neighbors are still usable as a parent
or not, regardless of the neighbor cache. Note that this is not
standard-compliant (RFC 4861), as neighbors will be added regardless of
their reachability and liveness. */
#ifndef UIP_CONF_ND6_AUTOFILL_NBR_CACHE
#define UIP_CONF_ND6_AUTOFILL_NBR_CACHE (!UIP_CONF_ND6_SEND_NS)
#endif /* UIP_CONF_ND6_AUTOFILL_NBR_CACHE */

4
core/net/ipv6/uip-nd6.h
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@ -100,7 +100,9 @@
/* Neighbor not found in cache? Derive its link-layer address from it's
link-local IPv6, assuming it used autoconfiguration. This is not
standard-compliant but this is a convenient way to keep the
neighbor cache out of the way in cases ND is not used */
neighbor cache out of the way in cases ND is not used.
Note that this is not standard-compliant (RFC 4861), as neighbors will
be added regardless of their reachability and liveness. */
#define UIP_ND6_AUTOFILL_NBR_CACHE 0
#else
#define UIP_ND6_AUTOFILL_NBR_CACHE UIP_CONF_ND6_AUTOFILL_NBR_CACHE