Re: IPv6 "is unreachable" route flapping

[Paul Ripke <stix%stix.id.au@localhost>]

Time has passed, and I'm now running netbsd-9 on the orange pi, and
on the amd64 router. I still see these issues with IPv6 route flaps.

From the arm side:

Mar  9 20:52:20 thing1 dhcpcd[292]: emac0: Router Advertisement from fe80::52e5:49ff:fea6:f5d8
Mar  9 20:52:20 thing1 dhcpcd[292]: emac0: fe80::52e5:49ff:fea6:f5d8: no longer a default router
Mar  9 20:52:20 thing1 dhcpcd[292]: emac0: deleting default route via fe80::52e5:49ff:fea6:f5d8
Mar  9 20:52:42 thing1 dhcpcd[292]: emac0: Router Advertisement from fe80::52e5:49ff:fea6:f5d8
Mar  9 20:52:42 thing1 dhcpcd[292]: emac0: adding default route via fe80::52e5:49ff:fea6:f5d8

route monitor around that time:

 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-3158-7e00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 112 on Mon Mar  9 20:50:20 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:50:20 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-31a3-5d00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 112 on Mon Mar  9 20:52:20 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:52:20 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-3158-7e00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 112 on Mon Mar  9 20:52:20 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:52:20 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-31a3-5d00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 192 on Mon Mar  9 20:52:20 2020
RTM_DELETE: Delete Route: len 192, pid 292, seq 41, errno 0, flags: 0x842<GATEWAY,DONE,STATIC>
locks: 0x0 inits: 0x0
sockaddrs: 0x7<DST,GATEWAY,NETMASK>
 :: fe80::52e5:49ff:fea6:f5d8%emac0 default
got message of size 168 on Mon Mar  9 20:52:20 2020
RTM_ADD: Add Route: len 168, pid 0, seq 0, errno 0, flags: 0x2445<UP,HOST,DONE,LLINFO,CLONED>
locks: 0x0 inits: 0x0
sockaddrs: 0x3<DST,GATEWAY>
 2001-44b8-3158-7e00-52e5-49ff-fea6-f5d8.static.ipv6.internode.on.net 50:e5:49:a6:f5:d8
got message of size 152 on Mon Mar  9 20:52:20 2020
RTM_MISS: Lookup failed on this address: len 152, pid 957, seq 0, errno 0, flags: 0x40<DONE>
locks: 0x0 inits: 0x0
sockaddrs: 0x1<DST>
 2401:fa00:9:210:7dee:5cce:d049:214f
got message of size 152 on Mon Mar  9 20:52:20 2020
RTM_MISS: Lookup failed on this address: len 152, pid 957, seq 0, errno 0, flags: 0x40<DONE>
locks: 0x0 inits: 0x0
sockaddrs: 0x1<DST>
 2401:fa00:9:210:7dee:5cce:d049:214f
...
got message of size 152 on Mon Mar  9 20:52:22 2020
RTM_MISS: Lookup failed on this address: len 152, pid 957, seq 0, errno 0, flags: 0x40<DONE>
locks: 0x0 inits: 0x0
sockaddrs: 0x1<DST>
 2401:fa00:9:210:7dee:5cce:d049:214f
got message of size 152 on Mon Mar  9 20:52:22 2020
RTM_MISS: Lookup failed on this address: len 152, pid 957, seq 0, errno 0, flags: 0x40<DONE>
locks: 0x0 inits: 0x0
sockaddrs: 0x1<DST>
 2401:fa00:9:210:7dee:5cce:d049:214f
got message of size 112 on Mon Mar  9 20:52:23 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:52:23 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-3158-7e00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 112 on Mon Mar  9 20:52:23 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:52:23 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-31a3-5d00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 152 on Mon Mar  9 20:52:23 2020
RTM_MISS: Lookup failed on this address: len 152, pid 0, seq 0, errno 0, flags: 0x40<DONE>
locks: 0x0 inits: 0x0
sockaddrs: 0x1<DST>
 2401:fa00:9:210:7dee:5cce:d049:214f
got message of size 152 on Mon Mar  9 20:52:23 2020
RTM_MISS: Lookup failed on this address: len 152, pid 0, seq 0, errno 0, flags: 0x40<DONE>
locks: 0x0 inits: 0x0
sockaddrs: 0x1<DST>
 2401:fa00:9:210:7dee:5cce:d049:214f
...
got message of size 152 on Mon Mar  9 20:52:42 2020
RTM_MISS: Lookup failed on this address: len 152, pid 957, seq 0, errno 0, flags: 0x40<DONE>
locks: 0x0 inits: 0x0
sockaddrs: 0x1<DST>
 2401:fa00:9:210:7dee:5cce:d049:214f
got message of size 152 on Mon Mar  9 20:52:42 2020
RTM_MISS: Lookup failed on this address: len 152, pid 957, seq 0, errno 0, flags: 0x40<DONE>
locks: 0x0 inits: 0x0
sockaddrs: 0x1<DST>
 2401:fa00:9:210:7dee:5cce:d049:214f
got message of size 112 on Mon Mar  9 20:52:42 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:52:42 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-3158-7e00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 112 on Mon Mar  9 20:52:42 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:52:42 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-31a3-5d00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 240 on Mon Mar  9 20:52:42 2020
RTM_ADD: Add Route: len 240, pid 292, seq 42, errno 0, flags: 0x843<UP,GATEWAY,DONE,STATIC>
locks: 0x0 inits: 0x0
sockaddrs: 0x17<DST,GATEWAY,NETMASK,IFP>
 :: fe80::52e5:49ff:fea6:f5d8%emac0 :: link#1
got message of size 192 on Mon Mar  9 20:52:51 2020
RTM_LOSING: Kernel Suspects Partitioning: len 192, pid 0, seq 0, errno 0, flags: 0x843<UP,GATEWAY,DONE,STATIC>
locks: 0x0 inits: 0x0
sockaddrs: 0x7<DST,GATEWAY,NETMASK>
 2401:fa00:9:210:7dee:5cce:d049:214f fe80::52e5:49ff:fea6:f5d8%emac0 default
got message of size 168 on Mon Mar  9 20:52:51 2020
RTM_ADD: Add Route: len 168, pid 0, seq 0, errno 0, flags: 0x2445<UP,HOST,DONE,LLINFO,CLONED>
locks: 0x0 inits: 0x0
sockaddrs: 0x3<DST,GATEWAY>
 fe80::52e5:49ff:fea6:f5d8%emac0 50:e5:49:a6:f5:d8
got message of size 112 on Mon Mar  9 20:52:58 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:52:58 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-3158-7e00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 112 on Mon Mar  9 20:52:58 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:52:58 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-31a3-5d00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net
got message of size 112 on Mon Mar  9 20:53:14 2020
#12: len 112, got message of size 120 on Mon Mar  9 20:53:14 2020
RTM_NEWADDR: address being added to iface: len 120, pid 292, metric 0, addrflags: 0x0
sockaddrs: 0x34<NETMASK,IFP,IFA>
 ffff:ffff:ffff:ffff:: 02:42:db:e7:b6:a4 2001-44b8-3158-7e00-0042-dbff-fee7-b6a4.static.ipv6.internode.on.net

-- 
Paul Ripke
"Great minds discuss ideas, average minds discuss events, small minds
 discuss people."
-- Disputed: Often attributed to Eleanor Roosevelt. 1948.