#!/usr/bin/perl
#
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# $TAHI: ct/nd.p2/V6LC_2_1_21_H.seq,v 1.4 2009/01/05 06:39:39 akisada Exp $
#
########################################################################

use nd;

BEGIN {}
END   {}

if($V6evalTool::NutDef{'Type'} ne 'host') {
	exitHostOnly();
	#NOTREACHED
}

startNdiscWorld($Link0);

vLogHTML('<FONT COLOR="#FF0000" SIZE="5"><U><B>Procedure</B></U></FONT><BR>');

step1($Link0);

$tr1_cache = 1;

if(ndiscStale2ReachableByPacketForwarding1($Link0) < 0) {
	exitFail();
	#NOTREACHED
}

if(ndSendNaReachable2ReachableFalse($Link0, 'local_ucast_na_rSo_tll') < 0) {
	exitFail();
	#NOTREACHED
}

exitPass();
#NOTREACHED



#------------------------------#
# setupCommon11()              #
#------------------------------#
sub
step1($)
{
	my ($Link) = @_;

	$NEED_COMMON_CLEANUP = 1;

	my $ra = 'mcast_ra_commonsetup';

	vClear($Link);
	vSend($Link, $ra);
	ignoreDAD($Link);

	$force_cleanup_r0 = 1;

	return;
}



#
# perldoc
#
########################################################################
__END__

=head1 Title

  Test v6LC.2.1.21: Neighbor Advertisement Processing, R-bit Change (Hosts Only)
  Part H

=head1 Purpose

  Verify that a host takes appropriate actions when a neighbor who is a router starts transmitting
  Neighbor Advertisements with the Router flag clear.

=head1 References

  * [ND]  Section 7.2.5

=head1 Resource Requirements

  * Packet generator
  * Monitor to capture packets

=head1 Test Setup

  No Common Test Setup is performed. The Common Test Cleanup procedure is
  performed after each part.

=begin html

<BLOCKQUOTE>

<TABLE BORDER>
<Caption>Router Advertisement</Caption>
<TR>
<TD>
	IPv6 Header<br>
	Next Header: 58<br>
	Source Address: TN1's Link-local Address<br>
</TD>
</TR>
<TR>
<TD>
	Router Advertisement<br>
	Router Lifetime: 20 seconds<br>
	Reachable Time: 100 seconds<br>
	Retransmit Interval: 1 second<br>
	Prefix: TR1's Global Prefix<br>
</TD>
</TR>
</TABLE>

<br>

<TABLE BORDER>
<Caption>Packet A</Caption>
<TR>
<TD>
        IPv6 Header<br>
        Next Header: 58<br>
        Source Address: TN1's off-link Global Address<br>
        Destination Address: HUT's Global Address
</TD>
</TR>
<TR>
<TD>
	ICMPv6 Echo Request
</TD>
</TR>
</TABLE>

<br>

<TABLE BORDER>
<Caption>Neighbor Advertisement H</Caption>
<TR>
<TD>
        IPv6 Header<br>
        Next Header: 58<br>
        Source Address: TR1's Link-local Address<br>
</TD>
</TR>
<TR>
<TD>
        Neighbor Advertisement<br>
	Router flag: 0<br>
        Solicited flag: 1<br>
        Override flag: 0<br>
	Target Link-Layer option: TR1's Link-layer address
</TD>
</TR>

</TABLE>
</BLOCKQUOTE>

=end html


=head1 Procedure

   1. TR1 transmits the Router Advertisement without a Source Link-layer Address Option.
   2. TN1 transmits Packet A.
   3. Observe the packets transmitted by the HUT.
   4. TR1 responds to Neighbor Solicitations from the HUT with a Neighbor Advertisement with the
      Router, Solicited, and Override flags set.
   5. Observe the packets transmitted by the HUT.
   6. TR1 transmits Neighbor Advertisement A.
   7. TN1 transmits Packet A.
   8. Observe the packets transmitted by the HUT.
   9. Perform common cleanup procedure.
  10. Repeat Steps 1 through 8 seven times with Neighbor Advertisement B, C, D, E, F, G and H
      respectively in Step 6.

=head1 Observable Results

  Step 3:
  The HUT should solicit TR1 by transmitting Neighbor Solicitations with a Target Address of
  TR1's Link-local Address.

  Step 5:
  The HUT should transmit an Echo Reply to Packet A using the TR1 as the first hop.

  Step 8:
  The HUT MUST not transmit an Echo Reply using TR1 as the first hop in response to Packet
  A in Step 7 and the HUT MUST not transmit multicast NS's with a target set to TR1's link-local
  address.

=head1 Possible Problems

  * None. 

=cut