<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>This is my current setup right now and the reason why I want to reject or drop the AAAA queries;</DIV>
<DIV> </DIV>
<DIV>PC Clients: XP, Vista and 7 (Vista and 7 clients are sending both A and AAAA queries) send queries to DNS A.<BR>DNS A: will just forward the query to My DNS<BR>MyDNS: will query to DNS B in behalf of DNS A.</DIV>
<DIV>DNS B: hosting the domain name (sample: xxx.test.com)</DIV>
<DIV> </DIV>
<DIV>DNS B only hosting A record for xxx.test.com so when it receive AAAA query, it respond "no such name" or NXDOMAIN. <BR>This result causes negative caching on MyDNS and name resolution will also fail for other client computers.<BR>I only have control on MyDNS so I am thinking if there is any way that I can reject/drop those AAAA queries so it will not query to DNS B.<BR></DIV>
<DIV>Regards,</DIV>
<DIV>Rock</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><BR>
<DIV style="FONT-FAMILY: arial, helvetica, sans-serif; FONT-SIZE: 13px"><FONT size=2 face=Tahoma>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Mark Andrews <marka@isc.org><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Rock July <headgear17@yahoo.com><BR><B><SPAN style="FONT-WEIGHT: bold">Cc:</SPAN></B> Bind Users <bind-users@lists.isc.org><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Fri, July 23, 2010 6:37:41 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: reject or drop AAAA queries<BR></FONT><BR><BR>In message <<A href="mailto:210229.86286.qm@web120110.mail.ne1.yahoo.com" ymailto="mailto:210229.86286.qm@web120110.mail.ne1.yahoo.com">210229.86286.qm@web120110.mail.ne1.yahoo.com</A>>, Rock July writes:<BR>> <BR>> Hi All,<BR>> <BR>> I just want to know if I put listen-aaaa-on-v4 {yes;}; on opetions of <BR>> named.conf, will my DNS drop or reject all AAAA queries by IPv4 clients?<BR><BR>The option is filter-aaaa-on-v4. Additionally filter-aaaa can be used<BR>to only
apply the filter to some IPv4 clients.<BR><BR>We also recommend that you fix the underlying condition.<BR><BR>> Thanks,<BR>> Rock July<BR>-- <BR>Mark Andrews, ISC<BR>1 Seymour St., Dundas Valley, NSW 2117, Australia<BR>PHONE: +61 2 9871 4742 INTERNET: <A href="mailto:marka@isc.org" ymailto="mailto:marka@isc.org">marka@isc.org</A><BR></DIV></DIV></div><br>
</body></html>