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<TITLE>RE: DHCPv6 self-test RAND of .1 fails</TITLE>
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<P><FONT SIZE=2 FACE="Arial">I apologize for the multiple emails, =
but I wanted to mention that the tests do not fail when RAND is -.1, =
which leads me to believe there is an anomaly in the TAHI test suite =
when RAND is .1.</FONT></P>
<P><FONT SIZE=2 FACE="Arial">Best Regards,<BR>
Tammy Leino</FONT>
</P>
<BR>
<UL>
<P><FONT FACE="Arial"><SPAN LANG="en-us"></SPAN></FONT><SPAN =
LANG="en-us"> <FONT SIZE=1 FACE="Tahoma">-----Original =
Message-----</FONT></SPAN>
<BR><SPAN LANG="en-us"><B><FONT SIZE=1 FACE="Tahoma">From: =
</FONT></B> <FONT SIZE=1 FACE="Tahoma">Leino, Tammy =
</FONT></SPAN>
<BR><SPAN LANG="en-us"><B><FONT SIZE=1 =
FACE="Tahoma">Sent: </FONT></B> <FONT SIZE=1 =
FACE="Tahoma">Tuesday, September 18, 2007 5:19 PM</FONT></SPAN>
<BR><SPAN LANG="en-us"><B><FONT SIZE=1 =
FACE="Tahoma">To: </FONT></B> <FONT SIZE=1 =
FACE="Tahoma">'dhcptest@tahi.org'</FONT></SPAN>
<BR><SPAN LANG="en-us"><B><FONT SIZE=1 =
FACE="Tahoma">Subject: </FONT>=
</B> <FONT SIZE=1 FACE="Tahoma">DHCPv6 self-test RAND of .1 =
fails</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Hello =
All,</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Whenever my node =
generates a RAND value of .1, the TAHI test suite fails for all max =
retransmission time tests. It seems the TAHI test suite is =
interpretting the definition of RAND in RFC 3315 as -.1 to .1 =
non-inclusive.</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Here is the =
situation for RFC 3315 test #37 when RAND is chosen as .1 in =
retransmissions:</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">First =
retransmission</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">RT = IRT + (RAND * IRT)</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">RT = 1 + (.1 * 1)</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">RT = 1.1</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">Second retransmission</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">RT = (2 * RTprev) + (RAND * RTprev)</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">RT = (2 * 1.1) + (.1 * 1.1)</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">RT = 2.31</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">Third retransmission</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">RT = (2 * RTprev) + (RAND * RTprev)</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">RT = (2 * 2.31) + (.1 * 2.31)</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#000000" SIZE=2 =
FACE="Arial">RT = 4.851</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">The test fails =
here due to "Actual RT is bigger than the expected maximum =
value". I am not sure what the expected maximum value =
is.</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">First, can someone =
comment on whether the TAHI test suite interprets the RAND values =
defined in RFC 3315 as inclusive or non-inclusive?</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Second, if the =
values are supposed to be inclusive, can someone verify that this is a =
problem with the TAHI test suite?</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Best =
Regards,</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Tammy =
Leino</FONT></SPAN>
</P>
</UL>
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