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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 <me@anuragbhatia.com> </div>
<div>Date: 24/06/2017 21:53 (GMT+10:00) </div>
<div>To: SANOG <sanog@sanog.org>, mailman_APNIC-talk <apnic-talk@apnic.net> </div>
<div>Subject: [apnic-talk] Issue with ISC F root IPv6 routing in Chennai </div>
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<div dir="ltr">Hello,
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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 - <b>2001:500:2f::f</b></div>
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<div><img src="cid:ii_15cd9e7c7736d7a7" alt="Inline image 1" width="544" height="257"><br>
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<div>If I trace it from the RIPE Atlas anchor, I get following: </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"> <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"> 7 * * * *</font></div>
<div><font face="monospace, monospace" size="1"> 8 * * * *</font></div>
<div><font face="monospace, monospace" size="1"> 9 * * * *</font></div>
<div><font face="monospace, monospace" size="1"> 10 * * * *</font></div>
<div><font face="monospace, monospace" size="1"> 11 * * * *</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: </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
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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"> 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"> E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH</font></div>
<div><font face="monospace, monospace" size="1"> 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 <span style="background-color:rgb(255,255,0)">2001:500:2f::/48</span> 2001:de8:1:2::3 10 100 0 BE </font></div>
<div><font face="monospace, monospace" size="1"> 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"> 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"> E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH</font></div>
<div><font face="monospace, monospace" size="1"> 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 <span style="background-color:rgb(255,255,0)">2001:500:2f::/48</span> 2001:de8:1:2::4 10 100 0 E </font></div>
<div><font face="monospace, monospace" size="1"> 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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