described the configuration script.

kame/kame/dhcp6/dhcp6c.8

@@ -1,4 +1,4 @@
-.\"	$KAME: dhcp6c.8,v 1.20 2003/01/21 12:05:37 jinmei Exp $
+.\"	$KAME: dhcp6c.8,v 1.21 2003/04/11 07:32:13 jinmei Exp $
 .\"
 .\" Copyright (C) 1998 and 1999 WIDE Project.
 .\" All rights reserved.
@@ -93,6 +93,33 @@ contains pid of the currently running
 is the default configuration file.
 .It Pa /etc/dhcp6c_duid
 is the default file to store the client's DUID.
+.Sh Configuration Script
+When
+.Nm
+receives a reply message,
+it will invoke a supplementary configuration script specified in the
+.Xr dhcp6c.conf 5
+file.
+The daemon will provide the script with configuration parameters as
+environment variables,
+which include:
+.Pp
+.Bl -tag -width Ds -compact
+.It Ic REASON
+The reason why the script is invoked.
+As of this writing,
+the value is always
+\(dqNBI\(dq
+and thus meaningless.
+.It Ic new_domain_name_servers
+A list of available DNS servers,
+each of which is an IPv6 numeric address and is separated by a white
+space character.
+.El
+.Pp
+Note that the daemon does not always provide all the parameters.
+It sets an environment variable only when the corresponding
+configuration parameter is provided by the DHCPv6 server.
 .El
 .\"
 .Sh SEE ALSO