<div dir="ltr">Hi Sunny<div><br></div><div><br></div><div>Thanks for the message. While no one from ISC replied, I see they have acted by withdrawing announcements. </div><div><br></div><div><br></div><div><pre style="color:rgb(0,0,0)"><code> 2001:de8:1:2::3 24049 ESTAB 35d22h56m <span style="background-color:rgb(255,255,0)">0</span> 0 2314 0
2001:de8:1:2::4 24049 ESTAB 136d14h17m <span style="background-color:rgb(255,255,0)">0</span> 0 2314 0 </code></pre></div><div><br></div><div><br></div><div> </div><div>I hope ISC has an arrangement on IPv6 transit at NIXI (just like they would have for IPv4) since people around routes partially at NIXI to balance off traffic. </div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jun 24, 2017 at 5:32 PM, Srinivas Chendi <span dir="ltr"><<a href="mailto:sunny@apnic.net" target="_blank">sunny@apnic.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Hi Anurag</div>
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<div>Forwarded your email to ISC team. Hope they will look into this soon.</div>
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<div>Sunny</div>
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<div dir="auto" style="font-size:85%;color:#575757">Sent from my Samsung Galaxy smartphone.</div>
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<div>-------- Original message --------</div>
<div>From: Anurag Bhatia <<a href="mailto:me@anuragbhatia.com" target="_blank">me@anuragbhatia.com</a>> </div>
<div>Date: 24/06/2017 21:53 (GMT+10:00) </div>
<div>To: SANOG <<a href="mailto:sanog@sanog.org" target="_blank">sanog@sanog.org</a>>, mailman_APNIC-talk <<a href="mailto:apnic-talk@apnic.net" target="_blank">apnic-talk@apnic.net</a>> </div>
<div>Subject: [apnic-talk] Issue with ISC F root IPv6 routing in Chennai </div>
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<div dir="ltr">Hello,Â
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<div>Anyone here from NIXI or ISC? </div>
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<div>I see there's a consistent issue with IPv6 for F root anycast instance in Chennai hosted at NIXI -Â <b>2001:500:2f::f</b></div>
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<div>If I trace it from the RIPE Atlas anchor, I get following:Â </div>
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<div><font face="monospace, monospace" size="1">Probe #6107</font></div>
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<div><font face="monospace, monospace" size="1"> 1 2401:7500:fff0:1::1            0.838 ms   0.747 ms   0.632 ms</font></div>
<div><font face="monospace, monospace" size="1"> 2 2400:5200:1c00:d::1            1.755 ms   1.745 ms   1.726 ms</font></div>
<div><font face="monospace, monospace" size="1"> 3 2403:0:100::2be              2.089 ms   2.054 ms   2.049 ms</font></div>
<div><font face="monospace, monospace" size="1"> 4 2404:a800:2a00::13d           45.589 ms   26.274 ms   33.64 ms</font></div>
<div><font face="monospace, monospace" size="1"> 5 2404:a800::178              26.376 ms   25.406 ms   25.276 ms</font></div>
<div><font face="monospace, monospace" size="1">Â <span style="background-color:rgb(255,255,0)">
6 2001:de8:1:2::3             25.363 ms   25.232 ms   25.223 ms</span></font></div>
<div><font face="monospace, monospace" size="1">Â 7 * Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â * Â Â Â Â Â Â * Â Â Â Â Â Â *</font></div>
<div><font face="monospace, monospace" size="1">Â 8 * Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â * Â Â Â Â Â Â * Â Â Â Â Â Â *</font></div>
<div><font face="monospace, monospace" size="1">Â 9 * Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â * Â Â Â Â Â Â * Â Â Â Â Â Â *</font></div>
<div><font face="monospace, monospace" size="1">Â 10 * Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â * Â Â Â Â Â Â * Â Â Â Â Â Â *</font></div>
<div><font face="monospace, monospace" size="1">Â 11 * Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â * Â Â Â Â Â Â * Â Â Â Â Â Â *</font></div>
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<div>6th hop is ISC's router on NIXI Chennai peering fabric (2001:de8:1:2::/64). Clearly, there's an issue in return path and possibly setup is either without default or misconfigured IPv6 or partial table. </div>
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<div>on "sh bgp ipv6 sum" on NIXI Chennai route server, it gives:Â </div>
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<div><font face="monospace, monospace" size="1"> 2001:de8:1:2::3      24049    ESTAB  25d 3h10m   1      0     2263   0     </font></div>
<div><font face="monospace, monospace" size="1"> 2001:de8:1:2::4      24049    ESTAB  125d18h30m   1      0     2264   0 Â
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<div><font face="monospace, monospace" size="1">show ipv6 bgp neighbors 2001:de8:1:2::3 received-routes</font></div>
<div><font face="monospace, monospace" size="1">Â Â Â Â There are 1 received routes from neighbor 2001:de8:1:2::3</font></div>
<div><font face="monospace, monospace" size="1">Searching for matching routes, use ^C to quit...</font></div>
<div><font face="monospace, monospace" size="1">Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED</font></div>
<div><font face="monospace, monospace" size="1">Â Â Â Â E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH</font></div>
<div><font face="monospace, monospace" size="1">Â Â Â Â S:SUPPRESSED F:FILTERED s:STALE</font></div>
<div><font face="monospace, monospace" size="1">    Prefix       Next Hop     MED     LocPrf   Weight Status</font></div>
<div><font face="monospace, monospace" size="1">1 Â Â Â <span style="background-color:rgb(255,255,0)">2001:500:2f::/48</span> Â 2001:de8:1:2::3 10 Â Â Â Â 100 Â Â Â Â 0 Â Â Â BE Â Â </font></div>
<div><font face="monospace, monospace" size="1">Â Â Â Â Â AS_PATH: 24049 3557</font></div>
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<div><font face="monospace, monospace" size="1">show ipv6 bgp neighbors 2001:de8:1:2::4 received-routes</font></div>
<div><font face="monospace, monospace" size="1">Â Â Â Â There are 1 received routes from neighbor 2001:de8:1:2::4</font></div>
<div><font face="monospace, monospace" size="1">Searching for matching routes, use ^C to quit...</font></div>
<div><font face="monospace, monospace" size="1">Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED</font></div>
<div><font face="monospace, monospace" size="1">Â Â Â Â E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH</font></div>
<div><font face="monospace, monospace" size="1">Â Â Â Â S:SUPPRESSED F:FILTERED s:STALE</font></div>
<div><font face="monospace, monospace" size="1">    Prefix       Next Hop     MED     LocPrf   Weight Status</font></div>
<div><font face="monospace, monospace" size="1">1 Â Â Â <span style="background-color:rgb(255,255,0)">2001:500:2f::/48</span> Â 2001:de8:1:2::4 10 Â Â Â Â 100 Â Â Â Â 0 Â Â Â E Â Â Â </font></div>
<div><font face="monospace, monospace" size="1">Â Â Â Â Â AS_PATH: 24049 3557</font></div>
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<div>One should possible stop this BGP announcement until return path issue is fixed. </div>
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<div>Thanks. <br clear="all">
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<font face="arial, helvetica, sans-serif">Anurag Bhatia<br>
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<div><font face="arial, helvetica, sans-serif"><a href="http://anuragbhatia.com" target="_blank">anuragbhatia.com</a></font></div>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><font face="arial, helvetica, sans-serif"><br></font></div><div><br></div><font face="arial, helvetica, sans-serif">Anurag Bhatia<br></font><div></div><div><font face="arial, helvetica, sans-serif"><a href="http://anuragbhatia.com" target="_blank">anuragbhatia.com</a></font></div></div></div></div></div></div>
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