Hi Anurag Forwarded your email to ISC team. Hope they will look into this soon.
Sunny Sent from my Samsung Galaxy smartphone. -------- Original message -------- From: Anurag Bhatia <[email protected]> Date: 24/06/2017 21:53 (GMT+10:00) To: SANOG <[email protected]>, mailman_APNIC-talk <[email protected]> Subject: [apnic-talk] Issue with ISC F root IPv6 routing in Chennai Hello, Anyone here from NIXI or ISC? I see there's a consistent issue with IPv6 for F root anycast instance in Chennai hosted at NIXI - 2001:500:2f::f [Inline image 1] If I trace it from the RIPE Atlas anchor, I get following: Probe #6107 1 2401:7500:fff0:1::1 0.838 ms 0.747 ms 0.632 ms 2 2400:5200:1c00:d::1 1.755 ms 1.745 ms 1.726 ms 3 2403:0:100::2be 2.089 ms 2.054 ms 2.049 ms 4 2404:a800:2a00::13d 45.589 ms 26.274 ms 33.64 ms 5 2404:a800::178 26.376 ms 25.406 ms 25.276 ms 6 2001:de8:1:2::3 25.363 ms 25.232 ms 25.223 ms 7 * * * * 8 * * * * 9 * * * * 10 * * * * 11 * * * * 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. on "sh bgp ipv6 sum" on NIXI Chennai route server, it gives: 2001:de8:1:2::3 24049 ESTAB 25d 3h10m 1 0 2263 0 2001:de8:1:2::4 24049 ESTAB 125d18h30m 1 0 2264 0 show ipv6 bgp neighbors 2001:de8:1:2::3 received-routes There are 1 received routes from neighbor 2001:de8:1:2::3 Searching for matching routes, use ^C to quit... Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH S:SUPPRESSED F:FILTERED s:STALE Prefix Next Hop MED LocPrf Weight Status 1 2001:500:2f::/48 2001:de8:1:2::3 10 100 0 BE AS_PATH: 24049 3557 show ipv6 bgp neighbors 2001:de8:1:2::4 received-routes There are 1 received routes from neighbor 2001:de8:1:2::4 Searching for matching routes, use ^C to quit... Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH S:SUPPRESSED F:FILTERED s:STALE Prefix Next Hop MED LocPrf Weight Status 1 2001:500:2f::/48 2001:de8:1:2::4 10 100 0 E AS_PATH: 24049 3557 One should possible stop this BGP announcement until return path issue is fixed. Thanks. -- Anurag Bhatia anuragbhatia.com<http://anuragbhatia.com>
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