.B ENOENT
.RI ( "No such file or directory" ).
.PP
+So for example an attempt by uid 432
+to bind to [2620:106:e002:f00f::21]:80
+would result in authbind calling
+.I access(2)
+on, in order,
+.RS
+.B /etc/authbind/byport/80
+.br
+.B /etc/authbind/byaddr/2620:106:e002:f00f::21,80
+.br
+.B /etc/authbind/byaddr/2620:106:e002:f00f:0:0:0:21,80
+.RE
+If none of these files exist, authbind will read
+.RS
+.B /etc/authbind/byuid/432
+.RE
+and search for a line to permit
+the relevant access; examples of lines which would do so are:
+.RS
+.B 2620:106:e002:f00f::21,80
+.br
+.B ::/0,80
+.RE
+.PP
If a read error occurs, or the directory
.B /etc/authbind
cannot be accessed, then not only will
fail, but an error message will be printed to stderr. Unrecognised
lines in
.BI /etc/authbind/byuid/ uid
-files are silently ignored (as are lines whose
+files are silently ignored, as are lines whose
.I addr
has non-zero bits more than
.I length
-from the top) or where some
+from the top or where some
.I min
is larger than
.IR max .