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<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Hi Michael,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Interesting Observation below<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">A trace from
<a href="http://lg.he.net/">http://lg.he.net/</a> (using their own default freemont pop, or any others I pick in the US) give these results:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">On an IP from original /24, three packets give response at all hops including
</span><span lang="EN-US">103.20.20.1 on your network.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">On an IP from new Range, 2/3 Packets fail to get a response to 103.232.216.1
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">It would be interesting to get a device with both an old and new IP on your network with the same default GW and using the same firewall policy and hitting them both the same way.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">No breakthrough here for you sorry mate, but just another perspective that makes this more interesting.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Marcus.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> AusNOG [mailto:ausnog-bounces@lists.ausnog.net]
<b>On Behalf Of </b>Michael J. Carmody<br>
<b>Sent:</b> Monday, 22 September 2014 4:19 PM<br>
<b>To:</b> ausnog@ausnog.net<br>
<b>Subject:</b> [AusNOG] Not quite routing issue<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hey All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">With the recent allotment of another APNIC subnet to our company, we have been beating our head against an issue which has us stumped.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In short a client on a layer-2 service cannot reach Facebook, Seek, ADP Payroll portal and a bunch of other websites intermittently, but more often not, than can…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">When we move them to our original subnet range (same router, same layer 2 service, same client CPE) all is well.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We original suspected a routing issue, but pings/traceroutes work. Then we expected a MSS/MTU issue, but clamping all the way down to 1300 made no difference.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We then got weird and noticed we could get a response from the loadbalancer/CDN/proxy of facebook, asking for a nonsense URL, but if we asked for a valid URL we get no reply.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So we seem to have an issue affecting Facebook, seek.com.au and ADP payroll, that is not routing related (can ping/traceroute without an issue), not MTU related, (can clamp up and down without any affect), but somehow
related to the IP range of CDN fronted services?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">103.20.20.x/24 works for us and all our clients.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">103.232.216.x/23 seems to work mostly with sporadic sites not loading.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Same router, same upstream peer, same everything else…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Can someone point out where our stupidity lies? We are very stumped here.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-Michael Carmody<o:p></o:p></span></p>
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