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Better documentation of the UIP_CONF_ND6_SEND_NA flag.

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This commit is contained in:
Simon Duquennoy 2015-10-06 16:40:53 +02:00
parent 1ac5d85042
commit 7ce817ab4c
1 changed files with 10 additions and 2 deletions
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12
core/contiki-default-conf.h
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@ -193,13 +193,21 @@
#endif /* NBR_TABLE_CONF_MAX_NEIGHBORS */
/* UIP_CONF_ND6_SEND_RA enables standard IPv6 Router Advertisement.
* This is unneeded when RPL is used. */
* We enable it by default when IPv6 is used without RPL. */
#ifndef UIP_CONF_ND6_SEND_RA
#define UIP_CONF_ND6_SEND_RA (NETSTACK_CONF_WITH_IPV6 && !UIP_CONF_IPV6_RPL)
#endif /* UIP_CONF_ND6_SEND_RA */
/* UIP_CONF_ND6_SEND_NA enables standard IPv6 Neighbor Discovery Protocol.
This is unneeded when RPL is used. */
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 and DAO messages. This is always sufficient
for RPL routing, i.e. to send to the preferred parent or any child.
Link-local unicast to other neighbors may, however, not be possible if
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. */
#ifndef UIP_CONF_ND6_SEND_NA
#define UIP_CONF_ND6_SEND_NA (NETSTACK_CONF_WITH_IPV6 && !UIP_CONF_IPV6_RPL)
#endif /* UIP_CONF_ND6_SEND_NA */