<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
h2
{mso-style-priority:9;
mso-style-link:"Heading 2 Char";
margin-top:10.0pt;
margin-right:0in;
margin-bottom:0in;
margin-left:0in;
margin-bottom:.0001pt;
page-break-after:avoid;
font-size:13.0pt;
font-family:"Cambria","serif";
color:#4F81BD;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.Heading2Char
{mso-style-name:"Heading 2 Char";
mso-style-priority:9;
mso-style-link:"Heading 2";
font-family:"Cambria","serif";
color:#4F81BD;
font-weight:bold;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello Team,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am getting too many entries for reducing the EDNS Packet size to 512 bytes in my log file.<o:p></o:p></p><p class=MsoNormal>For Eg:<o:p></o:p></p><p class=MsoNormal><span style='font-size:8.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:20 IPv6-DNS named[3769]: success resolving 'dns1.vps.net/A' (in 'vps.net'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:21 IPv6-DNS named[3769]: success resolving 'ad.metanetwork.com/A' (in 'metanetwork.com'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:25 IPv6-DNS named[3769]: success resolving 'geo.admetanetwork.com/A' (in 'admetanetwork.com'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:31 IPv6-DNS named[3769]: success resolving 'tomcat.apache.org/A' (in 'apache.org'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:31 IPv6-DNS named[3769]: success resolving 'www.apache.org/A' (in 'apache.org'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:31 IPv6-DNS named[3769]: success resolving 'issues.apache.org/A' (in 'apache.org'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving 'ns1.zurich.surf.net/A' (in 'surf.net'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving 'ns2.surfnet.nl/AAAA' (in 'surfnet.nl'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving 'ns2.surfnet.nl/A' (in 'surfnet.nl'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving 'ns1.zurich.surf.net/AAAA' (in 'surf.net'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:34 IPv6-DNS named[3769]: success resolving './NS' (in '.'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:40 IPv6-DNS named[3769]: success resolving 'ns1.zurich.surf.net/A' (in 'surf.net'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Dec 31 03:07:40 IPv6-DNS named[3769]: success resolving 'ns1.zurich.surf.net/AAAA' (in 'surf.net'?) after reducing the advertised EDNS UDP packet size to 512 octets<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'><o:p> </o:p></span></p><p class=MsoNormal>On googling for this, I got to know that this come when remote DNS Server doesn’t support EDNS0 (i.e., packet size upto 4096 bytes).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Now I want to know whether my DNS Server supports EDNS0 for incoming request or not.<o:p></o:p></p><p class=MsoNormal>I use the ‘<b>OARC's DNS Reply Size Test Server’ </b>for the same and I got the below mentioned O/P:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>#dig +short rs.dns-oarc.net txt<o:p></o:p></p><p class=MsoNormal>rst.x476.rs.dns-oarc.net.<o:p></o:p></p><p class=MsoNormal>rst.x450.x476.rs.dns-oarc.net.<o:p></o:p></p><p class=MsoNormal>rst.x490.x450.x476.rs.dns-oarc.net.<o:p></o:p></p><p class=MsoNormal>"Tested at 2012-12-31 09:40:11 UTC"<o:p></o:p></p><p class=MsoNormal>"164.100.1.206 sent EDNS buffer size 4096"<o:p></o:p></p><p class=MsoNormal>"164.100.1.206 DNS reply size limit is at least 490"<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Does this mean that my server is not supporting EDNS0 ???<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#76923C'>Thanks and Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#76923C'>Gaurav Kansal<o:p></o:p></span></p><p class=MsoNormal><span style='color:#76923C'>Mob – 9910118448<o:p></o:p></span></p><p class=MsoNormal><span style='color:#76923C'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#76923C'>Happy New Year 2013.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:gray'>IPv4 is Over,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:gray'>Are your ready for new Network.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>