Date: Mon, 31 Mar 2008 19:16:59 +0900
From: Mitsuru Chinen <mitch@linux.vnet.ibm.com>
Subject: [dhcptest:00261] [Client Test] Timeout value is short at #28
To: dhcptest@tahi.org
Message-Id: <20080331191659.aa10cb0a.mitch@linux.vnet.ibm.com>
X-Mail-Count: 00261

Hi there,

I found an issue in the following client test:
  #28 Part C : Maximum Elapsed Time in elapsed-time field

Timeout value is 610 for receiving retransmitted Renew messages.
I suppose 610 comes MRT(600) + some buffer(10).
However, the maximum value of RT is defined with the following
calcuration. (ref. RFC3315, Section 14)

  RT = MRT + RAND_MAX * MRT

As the RAND_MAX is 0.1. the maximum value of RT is 660.
Therefore, I think the timeout value should be 670.
The patch below is an proposal patch.

Thank you,
----
Mitsuru Chinen <mitch@linux.vnet.ibm.com>

diff -uprN DHCPv6_Self_Test_P2_1_0_8.orig/rfc3315/C_RFC3315_22_9_ElapTimeOpt_maxtime.seq DHCPv6_Self_Test_P2_1_0_8/rfc3315/C_RFC3315_22_9_ElapTimeOpt_maxtime.seq
--- DHCPv6_Self_Test_P2_1_0_8.orig/rfc3315/C_RFC3315_22_9_ElapTimeOpt_maxtime.seq	2007-02-01 16:50:26.000000000 +0900
+++ DHCPv6_Self_Test_P2_1_0_8/rfc3315/C_RFC3315_22_9_ElapTimeOpt_maxtime.seq	2008-03-31 11:33:16.000000000 +0900
@@ -64,7 +64,7 @@ my $IF0 = "Link0";
 my ($plifetime, $vlifetime) = (3000, 3500);
 #my ($time1, $time2) = (0.5*$plifetime, 0.8*$plifetime);
 my ($time1, $time2) = (50, 2500);
-my $timeout = 610;
+my $timeout = 670;
 my $maxrencounter = 9;
 vCapture($IF0);
 #--------------------------------------------------------------#