1: # Configuration for getaddrinfo(3).
    2: #
    3: # So far only configuration for the destination address sorting is needed.
    4: # RFC 3484 governs the sorting.  But the RFC also says that system
    5: # administrators should be able to overwrite the defaults.  This can be
    6: # achieved here.
    7: #
    8: # All lines have an initial identifier specifying the option followed by
    9: # up to two values.  Information specified in this file replaces the
   10: # default information.  Complete absence of data of one kind causes the
   11: # appropriate default information to be used.  The supported commands include:
   12: #
   13: # reload  <yes|no>
   14: #    If set to yes, each getaddrinfo(3) call will check whether this file
   15: #    changed and if necessary reload.  This option should not really be
   16: #    used.  There are possible runtime problems.  The default is no.
   17: #
   18: # label   <mask>   <value>
   19: #    Add another rule to the RFC 3484 label table.  See section 2.1 in
   20: #    RFC 3484.  The default is:
   21: #
   22: #label  ::1/128       0
   23: #label  ::/0          1
   24: #label  2002::/16     2
   25: #label ::/96          3
   26: #label ::ffff:0:0/96  4
   27: #label  fec0::/10     5
   28: #label  fc00::/7      6
   29: #
   30: #    This default differs from the tables given in RFC 3484 by handling
   31: #    (now obsolete) site-local IPv6 addresses and Unique Local Addresses.
   32: #    The reason for this difference is that these addresses are never
   33: #    NATed while IPv4 site-local addresses most probably are.  Given
   34: #    the precedence of IPv6 over IPv4 (see below) on machines having only
   35: #    site-local IPv4 and IPv6 addresses a lookup for a global address would
   36: #    see the IPv6 be preferred.  The result is a long delay because the
   37: #    site-local IPv6 addresses cannot be used while the IPv4 address is
   38: #    (at least for the foreseeable future) NATed.
   39: #
   40: # precedence  <mask>   <value>
   41: #    Add another rule the to RFC 3484 precedence table.  See section 2.1
   42: #    and 10.3 in RFC 3484.  The default is:
   43: #
   44: #precedence  ::1/128       50
   45: #precedence  ::/0          40
   46: #precedence  2002::/16     30
   47: #precedence ::/96          20
   48: #precedence ::ffff:0:0/96  10
   49: #
   50: #    For sites which prefer IPv4 connections change the last line to
   51: #
   52: #precedence ::ffff:0:0/96  100