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A me suona molto come un problema di hashing.
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<div class="">Qualche tipo di load-balancing (o ECMP o etherchannel) che effettua un hash sugli IP. Se cosi’ fosse, e’ evidente che uno dei percorsi su cui il load-balancing viene effettuato ha dei problemi.</div>
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<div class="">Saluti</div>
<div class="">Nicola</div>
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<div class="">On 29 Jan 2016, at 10:17, Giovanni Proscia <<a href="mailto:g.proscia@mainsoft.it" class="">g.proscia@mainsoft.it</a>> wrote:</div>
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Ciao a tutti,<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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scrivo per far presente un problema che potrebbe coinvolgere anche voi su connessioni verso gli Stati Uniti.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Stiamo rilevando da fine Dicembre una perdita di pacchetti su connessioni che transitano su Level3 dal loro nodo di Washington.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Se la connessione è instaurata con un IPv4 che termina con un numero dispari i pacchetti non passano, se pari la connessione viene stabilita correttamente.<o:p class=""></o:p></div>
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Non ne sono certo, ma sembrerebbe che i pacchetti DNS passino nella maniera contraria, quindi solo con IP dispari.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Allego due trace e due ping.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Il primo con IP pari (es. *.*.*.250), che raggiunge correttamente la destinazione:<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">Tracing route to<span class="Apple-converted-space"> </span><a href="http://sccp.skillport.com/" style="color: purple; text-decoration: underline;" class="">sccp.skillport.com</a><span class="Apple-converted-space"> </span>[209.235.9.7]<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">over a maximum of 30 hops:<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 1 <1 ms <1 ms <1 ms 10.200.0.2<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 2 <1 ms <1 ms <1 ms vl-04.1.<a href="http://edge.milan.mainsoft.it/" style="color: purple; text-decoration: underline;" class="">edge.milan.mainsoft.it</a><span class="Apple-converted-space"> </span>[185.45.209.3]<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class=""> 3 <1 ms <1 ms <1 ms <span class="Apple-converted-space"> </span><a href="http://xe-10-0-1.bar2.milan1.level3.net/" style="color: purple; text-decoration: underline;" class="">xe-10-0-1.bar2.milan1.level3.net</a><span class="Apple-converted-space"> </span>[213.242.65.177<o:p class=""></o:p></span></div>
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<span style="font-size: 9pt;" class="">]<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class=""> 4 95 ms 95 ms 95 ms <span class="Apple-converted-space"> </span><a href="http://ae-21-3603.car1.washington1.level3.net/" style="color: purple; text-decoration: underline;" class="">ae-21-3603.car1.washington1.level3.net</a><span class="Apple-converted-space"> </span>[4.69.158<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class="">.133]<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 5 99 ms 99 ms 100 ms <span class="Apple-converted-space"> </span><a href="http://sungard-net.car1.washington1.level3.net/" style="color: purple; text-decoration: underline;" class="">sungard-net.car1.washington1.level3.net</a><span class="Apple-converted-space"> </span>[4.34.23<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">6.86]<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class=""> 6 103 ms 104 ms 103 ms <span class="Apple-converted-space"> </span><a href="http://phl2cr1-te-0-0-1-2.sgns.net/" style="color: purple; text-decoration: underline;" class="">phl2cr1-te-0-0-1-2.sgns.net</a><span class="Apple-converted-space"> </span>[66.179.228.222]<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 7 103 ms 102 ms 104 ms <span class="Apple-converted-space"> </span><a href="http://bosir6-xe-1-2-0-0.sgns.net/" style="color: purple; text-decoration: underline;" class="">bosir6-xe-1-2-0-0.sgns.net</a><span class="Apple-converted-space"> </span>[69.164.83.170]<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class=""> 8 103 ms 101 ms 101 ms <span class="Apple-converted-space"> </span><a href="http://relayer.skillport.com/" style="color: purple; text-decoration: underline;" class="">relayer.skillport.com</a><span class="Apple-converted-space"> </span>[209.235.10.36]<o:p class=""></o:p></span></div>
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<b class=""><span lang="EN-US" style="font-size: 9pt;" class=""> 9 102 ms 102 ms 102 ms <span class="Apple-converted-space"> </span><a href="http://sccp.skillport.com/" style="color: purple; text-decoration: underline;" class="">sccp.skillport.com</a><span class="Apple-converted-space"> </span>[209.235.9.7]<o:p class=""></o:p></span></b></div>
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<span lang="EN-US" style="font-size: 9pt;" class=""><o:p class=""> </o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class="">Trace complete.<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class=""><o:p class=""> </o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class="">Pinging<span class="Apple-converted-space"> </span><a href="http://sccp.skillport.com/" style="color: purple; text-decoration: underline;" class="">sccp.skillport.com</a><span class="Apple-converted-space"> </span>[209.235.9.7]
with 32 bytes of data:<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class="">Reply from 209.235.9.7: bytes=32 time=105ms TTL=243<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">Reply from 209.235.9.7: bytes=32 time=102ms TTL=243<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">Reply from 209.235.9.7: bytes=32 time=103ms TTL=243<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">Reply from 209.235.9.7: bytes=32 time=104ms TTL=243<o:p class=""></o:p></span></div>
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<span lang="EN-US" class=""><o:p class=""> </o:p></span></div>
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Il secondo con IP dispari (es. *.*.*.251), che si ferma sulla rete di Level3.<o:p class=""></o:p></div>
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<span style="font-size: 9pt;" class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">Tracing route to<span class="Apple-converted-space"> </span><a href="http://sccp.skillport.com/" style="color: purple; text-decoration: underline;" class="">sccp.skillport.com</a><span class="Apple-converted-space"> </span>[209.235.9.7]<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">over a maximum of 30 hops:<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 1 <1 ms <1 ms <1 ms 10.200.0.2<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 2 <1 ms <1 ms <1 ms vl-04.1.<a href="http://edge.milan.mainsoft.it/" style="color: purple; text-decoration: underline;" class="">edge.milan.mainsoft.it</a><span class="Apple-converted-space"> </span>[185.45.209.3]<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 3 <1 ms <1 ms <1 ms <span class="Apple-converted-space"> </span><a href="http://xe-10-0-1.bar2.milan1.level3.net/" style="color: purple; text-decoration: underline;" class="">xe-10-0-1.bar2.milan1.level3.net</a><span class="Apple-converted-space"> </span>[213.242.65.177<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">]<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 4 259 ms 192 ms 219 ms <span class="Apple-converted-space"> </span><a href="http://ae-21-3603.car1.washington1.level3.net/" style="color: purple; text-decoration: underline;" class="">ae-21-3603.car1.washington1.level3.net</a><span class="Apple-converted-space"> </span>[4.69.158<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">.133]<o:p class=""></o:p></span></div>
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<span lang="EN-US" style="font-size: 9pt;" class=""> 5 * * * Request timed out.<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 6 * * * Request timed out.<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 7 * * * Request timed out.<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class=""> 8 * * * Request timed out.<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<b class=""><span lang="EN-US" style="font-size: 9pt;" class=""> 9 * * * Request timed out.<o:p class=""></o:p></span></b></div>
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<span lang="EN-US" style="font-size: 9pt;" class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">Pinging<span class="Apple-converted-space"> </span><a href="http://sccp.skillport.com/" style="color: purple; text-decoration: underline;" class="">sccp.skillport.com</a><span class="Apple-converted-space"> </span>[209.235.9.7]
with 32 bytes of data:<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">Request timed out.<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" style="font-size: 9pt;" class="">Request timed out.<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-size: 9pt;" class="">Request timed out.<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-size: 9pt;" class="">Request timed out.<o:p class=""></o:p></span></div>
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<o:p class=""> </o:p></div>
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Non mi è tutt’ora chiaro se ci sia una qualche formula matematica più complessa che divide gli IP tra quelli che passano e quelli che non passano.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<o:p class=""> </o:p></div>
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Sembra una cosa molto simile a quella accaduta con Telecom Italia tempo fa...<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Qualcuno che ha una connessione con Level3 potrebbe eseguire un test?<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Grazie a tutti per il vostro tempo,<o:p class=""></o:p></div>
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Giovanni.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<o:p class=""> </o:p></div>
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<span class="">Giovanni Proscia<o:p class=""></o:p></span></div>
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<span class="">ICT Manager<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="">IT/Development<o:p class=""></o:p></span></div>
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<span class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class=""><a href="mailto:g.proscia@mainsoft.it" style="color: purple; text-decoration: underline;" class="">g.proscia@mainsoft.it</a><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="">Office +39 02.893710.03<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class=""><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="">Mainsoft<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="">Viale Sarca, 336/F<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="">20126 Milano (MI) Italy<o:p class=""></o:p></span></div>
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<span class=""><o:p class=""> </o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" class="">Mainsoft home page<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" class="">Phone +39 02 5454104<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" class="">Fax +39 02 66112250<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-US" class="">Think before you print.<o:p class=""></o:p></span></div>
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