<div dir="ltr">That would have to be some seriously specific GeoDNS as they are both hitting Google Sydney (I assume).<div><br></div><div>Respond with blah over MP and blah of iPrimus... I wouldn't think so?</div></div>
<div class="gmail_extra"><br clear="all"><div><div dir="ltr"><div><br>...Skeeve</div><div><br></div><div><div><b style="font-size:13px;font-family:Calibri">Skeeve Stevens - </b><span style="font-size:13px;font-family:Calibri">eintellego Networks Pty Ltd</span></div>
<div><div><span style="font-family:Calibri;font-size:13px"><a href="mailto:skeeve@eintellegonetworks.com" target="_blank">skeeve@eintellegonetworks.com</a> ; <a href="http://www.eintellegonetworks.com/" target="_blank">www.eintellegonetworks.com</a></span><font><p style="font-family:Calibri;font-size:13px;margin:0px">
Phone: 1300 239 038; Cell +61 (0)414 753 383 ; <a>skype://skeeve</a></p><p style="font-family:Calibri;font-size:13px;margin:0px"><a href="http://facebook.com/eintellegonetworks" target="_blank">facebook.com/eintellegonetworks</a> ; <a href="http://twitter.com/networkceoau" target="_blank"></a><a href="http://linkedin.com/in/skeeve" target="_blank">linkedin.com/in/skeeve</a> </p>
<p style="font-family:Calibri;font-size:13px;margin:0px"><a href="http://twitter.com/theispguy" target="_blank">twitter.com/theispguy</a><span style="color:rgb(0,0,0)"> ; blog: </span><a href="http://www.theispguy.com/" target="_blank">www.theispguy.com</a><br>
</p><p style="font-family:Calibri;font-size:13px;margin:0px"><img src="http://eintellegonetworks.com/logos/ein09.png"><br></p><p style="margin:0px"><span style="color:rgb(127,0,127);font-family:Calibri,sans-serif;font-size:13px">The Experts Who The Experts Call</span></p>
</font></div><div style="font-family:Calibri,sans-serif;font-size:14px;color:rgb(127,0,127)"><span style="color:rgb(0,32,96);font-size:13px">Juniper - Cisco </span><span style="color:rgb(0,32,96);font-size:13px">- Cloud</span><span style="color:rgb(0,32,96);font-size:13px"> </span><span style="color:rgb(0,32,96);font-size:13px">- Consulting</span><span style="color:rgb(0,32,96);font-size:13px"> </span><span style="color:rgb(0,32,96);font-size:13px">- IPv4 Brokering</span></div>
</div></div></div></div>
<br><br><div class="gmail_quote">On Tue, Feb 18, 2014 at 10:49 PM, Nick @ Deltaband <span dir="ltr"><<a href="mailto:nick@deltaband.com" target="_blank">nick@deltaband.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Without seeing the hosts it's hard to know, but Route 53 supports a GeoDNS type service that can provide different answers based on a bunch of different policies inc latency. Could it be that? </div><div class="gmail_extra">
<br><br><div class="gmail_quote">On 18 February 2014 22:41, Skeeve Stevens <span dir="ltr"><<a href="mailto:skeeve+ausnog@eintellegonetworks.com" target="_blank">skeeve+ausnog@eintellegonetworks.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hey all,<div><br></div><div>I hope to hell I haven't missed something here, but I have spent a lot of hours trying to figure out this problem and it is proving a little hard to nail down.</div>
<div><br></div>
<div>Simply, googles public DNS 8.8.8.8 is giving me two different responses from different peering connections.</div><div><br></div><div>A response from 8.8.8.8 over Megaport MLPA is giving me a different response to 8.8.8.8 over direct iPrimus -> Google peering.</div>
<div><br></div><div>The DNS is being sourced from AWS Route53 - so there shouldn't be any conflicting information.</div><div><br></div><div>There is no round-robin involved because both sides are consistently returning the same information.</div>
<div><br></div><div>The correct answer is actually via the iPrimus connection.</div><div><br></div><div>The mind blowing thing is that I get the same 'different' response if I query the AWS DNS server directly via each connection (as below).</div>
<div><br></div><div>I hope this makes sense... and that I haven't missed something obvious. It almost feels like there is some split-view DNS going on here, but 8.8.8.8 wouldn't do that.</div><div><br></div><div>
Alternatively, one of the connections has some sort of transparent DNS... i.e. the Megaport one.. but it is just going through a Juniper SRX550 cluster doing NAT into a Juniper MX border going into Megaport - none of which is doing DNS magic.</div>
<div><br></div><div>The iPrimus connection is going into Checkpoints as the edge straight into iPrimus... but they are reporting the correct answer.</div><div><br></div><div>My head hurts :(</div><div><br></div><div><br>
</div>
<div><b>VIA MEGAPORT</b></div><div><br></div><div><div>[root@auth01n ~]# traceroute 8.8.8.8</div><div>traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets</div><div> 1 10.x.0.3 (10.x.0.3) 0.382 ms 0.353 ms 0.256 ms</div>
<div> 2 10.x.0.62 (10.x.0.62) 3.370 ms 3.325 ms 3.320 ms</div><div> 3 10.x.0.25 (10.x.0.25) 3.314 ms 3.297 ms 3.269 ms</div><div><b>NAT HERE</b></div><div> 4 <a href="http://as15169.sydney.megaport.com" target="_blank">as15169.sydney.megaport.com</a> (103.26.68.56) 3.180 ms 3.142 ms 3.142 ms</div>
<div> 5 72.14.237.21 (72.14.237.21) 3.125 ms 3.070 ms 3.077 ms</div><div> 6 <a href="http://google-public-dns-a.google.com" target="_blank">google-public-dns-a.google.com</a> (8.8.8.8) 3.042 ms 2.331 ms 2.236 ms</div>
<div><br></div>
<div><br></div><div>[root@auth01n ~]# dig a <a href="http://vpn.x.com" target="_blank">vpn.x.com</a> @<a href="http://8.8.8.8" target="_blank">8.8.8.8</a> </div><div><br></div><div>; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.23.rc1.el6_5.1 <<>> a <a href="http://vpn.x.com" target="_blank">vpn.x.com</a> @<a href="http://8.8.8.8" target="_blank">8.8.8.8</a></div>
<div>;; global options: +cmd</div><div>;; Got answer:</div><div>;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24261</div><div>;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0</div><div>
<br></div><div>;; QUESTION SECTION:</div><div>;<a href="http://vpn.x.com" target="_blank">vpn.x.com</a>. IN A</div><div><br></div><div>;; ANSWER SECTION:</div><div><a href="http://vpn.x.com" target="_blank">vpn.x.com</a>. 299 IN A <b>x.x.171.124</b></div>
<div><br></div><div>;; Query time: 166 msec</div><div>;; SERVER: 8.8.8.8#53(8.8.8.8)</div><div>;; WHEN: Tue Feb 18 22:28:24 2014</div><div>;; MSG SIZE rcvd: 48</div></div><div><br></div><div>=============</div><div><br>
</div>
<div><b>VIA IPRIMUS/EQUINIX</b></div><div><br></div><div><div>[root@auth01 ~]# traceroute 8.8.8.8</div><div>traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets</div><div> 1 10.x.65.2 (10.x.65.2) 0.476 ms 1.003 ms 1.227 ms</div>
<div> 2 10.x.126.5 (10.x.126.5) 0.471 ms 0.608 ms 0.410 ms</div><div><b>NAT HERE</b></div><div> 3 <a href="http://x.x.static.syd.iprimus.net.au" target="_blank">x.x.static.syd.iprimus.net.au</a> (203.134.x.x) 2.253 ms 2.064 ms 2.075 ms</div>
<div> 4 <a href="http://atm3-2.ac02.syd.iprimus.net.au" target="_blank">atm3-2.ac02.syd.iprimus.net.au</a> (203.134.2.249) 1.149 ms 0.768 ms <a href="http://at-1-0-2.ic02.pth.iprimus.net.au" target="_blank">at-1-0-2.ic02.pth.iprimus.net.au</a> (203.134.2.225) 1.107 ms</div>
<div> 5 <a href="http://xe-0-3-0.bsr01.equ.iprimus.net.au" target="_blank">xe-0-3-0.bsr01.equ.iprimus.net.au</a> (203.134.2.234) 1.313 ms 0.646 ms <a href="http://xe-1-0-0.bsr01.equ.iprimus.net.au" target="_blank">xe-1-0-0.bsr01.equ.iprimus.net.au</a> (203.134.2.254) 1.249 ms</div>
<div> 6 <a href="http://google-gw.syd.iprimus.net.au" target="_blank">google-gw.syd.iprimus.net.au</a> (203.134.2.98) 1.406 ms 1.260 ms 1.209 ms</div><div> 7 72.14.237.21 (72.14.237.21) 1.602 ms 1.871 ms 2.017 ms</div>
<div> 8 <a href="http://google-public-dns-a.google.com" target="_blank">google-public-dns-a.google.com</a> (8.8.8.8) 1.333 ms 1.393 ms 1.403 ms</div>
<div><br></div><div><br></div><div>[root@auth01 ~]# dig a <a href="http://vpn.x.com" target="_blank">vpn.x.com</a> @<a href="http://8.8.8.8" target="_blank">8.8.8.8</a> </div><div><br></div><div>; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.23.rc1.el6_5.1 <<>> a <a href="http://vpn.x.com" target="_blank">vpn.x.com</a> @<a href="http://8.8.8.8" target="_blank">8.8.8.8</a></div>
<div>;; global options: +cmd</div><div>;; Got answer:</div><div>;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43084</div><div>;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0</div><div>
<br></div><div>;; QUESTION SECTION:</div><div>;<a href="http://vpn.x.com" target="_blank">vpn.x.com</a>. IN A</div><div><br></div><div>;; ANSWER SECTION:</div><div><a href="http://vpn.x.com" target="_blank">vpn.x.com</a>. 174 IN A <b>x.x.102.124</b></div>
<div><br></div><div>;; Query time: 143 msec</div><div>;; SERVER: 8.8.8.8#53(8.8.8.8)</div><div>;; WHEN: Tue Feb 18 22:30:29 2014</div><div>;; MSG SIZE rcvd: 48</div></div><div><br clear="all"><div><div dir="ltr"><div><br>
...Skeeve</div><div><br></div><div><div><b style="font-size:13px;font-family:Calibri">Skeeve Stevens - </b><span style="font-size:13px;font-family:Calibri">eintellego Networks Pty Ltd</span></div><div><div><span style="font-family:Calibri;font-size:13px"><a href="mailto:skeeve@eintellegonetworks.com" target="_blank">skeeve@eintellegonetworks.com</a> ; <a href="http://www.eintellegonetworks.com/" target="_blank">www.eintellegonetworks.com</a></span><font><p style="font-family:Calibri;font-size:13px;margin:0px">
Phone: <a href="tel:1300%20239%20038" value="+611300239038" target="_blank">1300 239 038</a>; Cell <a href="tel:%2B61%20%280%29414%20753%20383" value="+61414753383" target="_blank">+61 (0)414 753 383</a> ; <a>skype://skeeve</a></p>
<p style="font-family:Calibri;font-size:13px;margin:0px"><a href="http://facebook.com/eintellegonetworks" target="_blank">facebook.com/eintellegonetworks</a> ; <a href="http://twitter.com/networkceoau" target="_blank"></a><a href="http://linkedin.com/in/skeeve" target="_blank">linkedin.com/in/skeeve</a> </p>
<p style="font-family:Calibri;font-size:13px;margin:0px"><a href="http://twitter.com/theispguy" target="_blank">twitter.com/theispguy</a><span> ; blog: </span><a href="http://www.theispguy.com/" target="_blank">www.theispguy.com</a><br>
</p><p style="font-family:Calibri;font-size:13px;margin:0px"><img src="http://eintellegonetworks.com/logos/ein09.png"><br></p><p style="margin:0px"><span style="color:rgb(127,0,127);font-family:Calibri,sans-serif;font-size:13px">The Experts Who The Experts Call</span></p>
</font></div><div style="font-family:Calibri,sans-serif;font-size:14px;color:rgb(127,0,127)"><span style="color:rgb(0,32,96);font-size:13px">Juniper - Cisco </span><span style="color:rgb(0,32,96);font-size:13px">- Cloud</span><span style="color:rgb(0,32,96);font-size:13px"> </span><span style="color:rgb(0,32,96);font-size:13px">- Consulting</span><span style="color:rgb(0,32,96);font-size:13px"> </span><span style="color:rgb(0,32,96);font-size:13px">- IPv4 Brokering</span></div>
</div></div></div></div>
</div></div>
<br>_______________________________________________<br>
AusNOG mailing list<br>
<a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><br>
<a href="http://lists.ausnog.net/mailman/listinfo/ausnog" target="_blank">http://lists.ausnog.net/mailman/listinfo/ausnog</a><br>
<br></blockquote></div><br></div>
</blockquote></div><br></div>