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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hey All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>103.20.20.x/24 works for us and all our clients.<o:p></o:p></p><p class=MsoNormal>103.232.216.x/23 seems to work mostly with sporadic sites not loading.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Same router, same upstream peer, same everything else…<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Can someone point out where our stupidity lies? We are very stumped here.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-Michael Carmody<o:p></o:p></p></div></body></html>