IPv6 nodeinfo default behaviour

[Loganaden Velvindron]

Hi guys,

OpenBSD recently removed support for RFC 4620 from their kernel completely.

The default value is 3 in FreeBSD.

According to the RFC:

 Security Considerations

   This protocol shares the security issues of ICMPv6 that are
   documented in the "Security Considerations" section of [5].

   This protocol has the potential of revealing information useful to a
   would-be attacker.  An implementation of this protocol MUST have a
   default configuration that refuses to answer queries from global-
   scope [3] addresses.

I suggest that we switch to 0 by default to be more RFC compliant.

Before I send the patch, I would like to get feedback.

Kind regards,
//Logan
C-x-C-c