introduced a flag bit "ND6_IFF_ACCEPT_RTADV" in the nd_ifinfo structure to

control whether to accept RAs per-interface basis.
the new stuff ensures the backward compatibility;
- the kernel does not accept RAs on any interfaces by default.
- since the default value of the flag bit is on, the kernel accepts RAs
  on all interfaces when net.inet6.ip6.accept_rtadv is 1.

Obtained from:	KAME
MFC after:	1 week

1 files changed, 11 insertions, 0 deletions

diff --git a/usr.sbin/ndp/ndp.8 b/usr.sbin/ndp/ndp.8
index 945f1ee..e9b75dd 100644
--- a/usr.sbin/ndp/ndp.8
+++ b/usr.sbin/ndp/ndp.8
@@ -135,6 +135,17 @@ which means the flag should be cleared.
 turn on or off NUD (Neighbor Unreachability Detection) on the
 interface.
 NUD is usually turned on by default.
+.It Xo
+.Ic accept_rtadv
+.Xc
+Specify whether or not to accept Router Advertisement messages
+received on the
+.Ar interface .
+Note that the kernel does not accept Router Advertisement messages
+unless the
+.Li net.inet6.ip6.accept_rtadv
+variable is non-0, even if the flag is on.
+This flag is set to 1 by default.
 .El
 .It Fl n
 Do not try to resolve numeric address to hostname.