<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META content="MSHTML 6.00.2900.6129" name=GENERATOR><LINK
href="BLOCKQUOTE{margin-Top: 0px; margin-Bottom: 0px; margin-Left: 2em}"
rel=stylesheet></HEAD>
<BODY style="FONT-SIZE: 10pt; MARGIN: 10px; FONT-FAMILY: verdana">
<DIV><FONT face=Verdana size=2>I test BIND 9.7.2-P2 and thus find </FONT><FONT
face=Verdana size=2>the ttl for negative responses is not following
rfc2308, </FONT></DIV>
<DIV><FONT face=Verdana size=2>and instead check the $TTL. If the TTL
is smaller than 3h, negative ttl is set to the
TTL, otherwise to check mimum TTL. If the value is smaller than
3h, negative ttl is set to the ttl, otherwise set to 3h(10800)</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV align=left><FONT face=Verdana color=#c0c0c0 size=2>2011-08-19
</FONT></DIV><FONT face=Verdana size=2>
<HR style="WIDTH: 122px; HEIGHT: 2px" align=left SIZE=2>
<DIV><FONT face=Verdana color=#c0c0c0
size=2><SPAN>Mingxing</SPAN></FONT></DIV></FONT></BODY></HTML>