<div dir="ltr">Sorry, I didn't check the IPs. Those aren't the IPs Umbrella usually returns for blocked sites, so this probably isn't the problem.<div>--Rich</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jul 24, 2024 at 10:05 AM Rich Greenwood <<a href="mailto:rgreenwood@shastacoe.org">rgreenwood@shastacoe.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Those resolvers are part of Cisco's Umbrella platform AKA OpenDNS and provides filtering services via DNS. It's possible that someone previously had your IP associated with their OpenDNS account and you are getting their filtering policies. If you are on a dynamic IP, you can try releasing and renewing the lease to get a different IP or just waiting. The other person's system should register their new IP with OpenDNS. If this is a static IP, I would set up an OpenDNS account and claim it, then you can turn off the filtering.<div>--Rich</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jul 24, 2024 at 9:36 AM Jeff Pang via dns-operations <<a href="mailto:dns-operations@dns-oarc.net" target="_blank">dns-operations@dns-oarc.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br><br><br>---------- Forwarded message ----------<br>From: Jeff Pang <<a href="mailto:jeff@simplemail.co.in" target="_blank">jeff@simplemail.co.in</a>><br>To: DNS Operations <<a href="mailto:dns-operations@dns-oarc.net" target="_blank">dns-operations@dns-oarc.net</a>><br>Cc: <br>Bcc: <br>Date: Wed, 24 Jul 2024 09:14:52 +0800<br>Subject: Is this a DNS pollution?<br> From my home isp I can't access the daum email correctly.<br>
<br>
I checked the DNS of imap/smtp via follows.<br>
<br>
$ dig <a href="http://smtp.daum.net" rel="noreferrer" target="_blank">smtp.daum.net</a><br>
<br>
; <<>> DiG 9.10.6 <<>> <a href="http://smtp.daum.net" rel="noreferrer" target="_blank">smtp.daum.net</a><br>
;; global options: +cmd<br>
;; Got answer:<br>
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8473<br>
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0<br>
<br>
;; QUESTION SECTION:<br>
;<a href="http://smtp.daum.net" rel="noreferrer" target="_blank">smtp.daum.net</a>. IN A<br>
<br>
;; ANSWER SECTION:<br>
<a href="http://smtp.daum.net" rel="noreferrer" target="_blank">smtp.daum.net</a>. 123 IN A 157.240.8.41<br>
<br>
;; Query time: 19 msec<br>
;; SERVER: 208.67.222.222#53(208.67.222.222)<br>
;; WHEN: Wed Jul 24 09:09:28 CST 2024<br>
;; MSG SIZE rcvd: 47<br>
<br>
$ dig <a href="http://imap.daum.net" rel="noreferrer" target="_blank">imap.daum.net</a><br>
<br>
; <<>> DiG 9.10.6 <<>> <a href="http://imap.daum.net" rel="noreferrer" target="_blank">imap.daum.net</a><br>
;; global options: +cmd<br>
;; Got answer:<br>
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8834<br>
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0<br>
<br>
;; QUESTION SECTION:<br>
;<a href="http://imap.daum.net" rel="noreferrer" target="_blank">imap.daum.net</a>. IN A<br>
<br>
;; ANSWER SECTION:<br>
<a href="http://imap.daum.net" rel="noreferrer" target="_blank">imap.daum.net</a>. 85 IN A 108.160.163.106<br>
<br>
;; Query time: 13 msec<br>
;; SERVER: 208.67.222.222#53(208.67.222.222)<br>
;; WHEN: Wed Jul 24 09:09:47 CST 2024<br>
;; MSG SIZE rcvd: 47<br>
<br>
<br>
<br>
I am certain that these two IPs are not the official IPs of <a href="http://daum.net" rel="noreferrer" target="_blank">daum.net</a>. <br>
May I ask if this situation is due to DNS pollution? The public DNS <br>
parser I am using is 208.67.222.222, which is a service provided by <br>
Cisco.<br>
<br>
Do you know how to stop this happens?<br>
<br>
Thanks<br>
<br>
-- <br>
regards,<br>
Jeff Pang<br>
<br><br><br>---------- Forwarded message ----------<br>From: Jeff Pang via dns-operations <<a href="mailto:dns-operations@dns-oarc.net" target="_blank">dns-operations@dns-oarc.net</a>><br>To: DNS Operations <<a href="mailto:dns-operations@dns-oarc.net" target="_blank">dns-operations@dns-oarc.net</a>><br>Cc: <br>Bcc: <br>Date: Wed, 24 Jul 2024 09:14:52 +0800<br>Subject: [dns-operations] Is this a DNS pollution?<br>_______________________________________________<br>
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</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><font face="monospace">Rich Greenwood<br>Senior Engineer<br></font><div><font face="monospace"><span style="background-color:transparent;color:rgb(0,0,0);white-space:pre-wrap">Shasta County Office of Education</span><br></font></div><div><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><font face="monospace">Information Technology</font></span></p><p style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><font face="monospace">1644 Magnolia Ave.</font></span></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><font face="monospace">Redding, CA 96001</font></span></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><font face="monospace">Office: 530-225-0161</font></span></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><font face="monospace"><a href="mailto:rgreenwood@shastacoe.org" target="_blank">rgreenwood@shastacoe.org</a></font></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"></p><div style="color:rgb(32,33,36);font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"></div><p></p><div style="color:rgb(32,33,36);font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><font face="monospace">Hotline: 530-225-0279</font></div><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><font face="monospace"><a href="mailto:hotline@shastacoe.org" target="_blank">hotline@shastacoe.org</a></font></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><font face="monospace"><a href="https://hotline.shastacoe.org" target="_blank">https://hotline.shastacoe.org</a></font></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><font face="monospace"><br></font></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><span style="border:none;display:inline-block;overflow:hidden;width:107px;height:37px"><font face="monospace"><img src="https://lh6.googleusercontent.com/bQuRd9bOFSBZoD5P8098OeKi2h-EQ7_wjxKrgjLnj_11EHSaq9pfSEsQC7k670anVhENdHBuRV36ohjuvTsma9Jnvqct2eFiGDp4p8HUJt5VtdiNw3inTO-dQb4bdoFXW157CNlU" style="margin-left: 0px; margin-top: 0px;" width="96" height="34"></font></span></span></p></div></div></div>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><font face="monospace">Rich Greenwood<br>Senior Engineer<br></font><div><font face="monospace"><span style="background-color:transparent;color:rgb(0,0,0);white-space:pre-wrap">Shasta County Office of Education</span><br></font></div><div><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><font face="monospace">Information Technology</font></span></p><p style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><font face="monospace">1644 Magnolia Ave.</font></span></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><font face="monospace">Redding, CA 96001</font></span></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><font face="monospace">Office: 530-225-0161</font></span></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><font face="monospace"><a href="mailto:rgreenwood@shastacoe.org" target="_blank">rgreenwood@shastacoe.org</a></font></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"></p><div style="color:rgb(32,33,36);font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"></div><p></p><div style="color:rgb(32,33,36);font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><font face="monospace">Hotline: 530-225-0279</font></div><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><font face="monospace"><a href="mailto:hotline@shastacoe.org" target="_blank">hotline@shastacoe.org</a></font></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><font face="monospace"><a href="https://hotline.shastacoe.org" target="_blank">https://hotline.shastacoe.org</a></font></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><font face="monospace"><br></font></p><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><span style="border:none;display:inline-block;overflow:hidden;width:107px;height:37px"><font face="monospace"><img src="https://lh6.googleusercontent.com/bQuRd9bOFSBZoD5P8098OeKi2h-EQ7_wjxKrgjLnj_11EHSaq9pfSEsQC7k670anVhENdHBuRV36ohjuvTsma9Jnvqct2eFiGDp4p8HUJt5VtdiNw3inTO-dQb4bdoFXW157CNlU" style="margin-left: 0px; margin-top: 0px;" width="96" height="34"></font></span></span></p></div></div></div>