netdev - Which interface events will remove IPv6 Proxy NDP addresses from the interface?

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Date:   Wed, 27 Jan 2021 14:55:38 -0500
From:   "Kevin P. Fleming" <kevin@...g.us>
To:     netdev@...r.kernel.org
Subject: Which interface events will remove IPv6 Proxy NDP addresses from the interface?

I'm trying to track down a problem with systemd-networkd; on three of
my machines, I have 'IPv6ProxyNDPAddress' configured in the network
configuration file so that additional addresses will be added when the
interface comes up.

Unfortunately, even though systemd-networkd is adding the addresses,
they disappear from the interface shortly afterward. It appears that
an interface event is occurring which removes them, and
systemd-networkd is not aware that it needs to re-add the addresses
when this event occurs.

An example is in the log below; 'eno1' (using the ixgbe driver in
kernel 5.10) is configured with five IPv6 Proxy NDP addresses. In the
log lines which include 'KPF' there is evidence that systemd-networkd
sent the requisite netlink messages to add them, and did not receive
any indication of failure. Yet, when I connect to the machine
immediately after bootup, the addresses are not in the table (as
displayed by 'ip neigh show proxy'). I can manually add them and the
system works as expected.

Can anyone indicate which event(s) in the log (this is a
systemd-networkd debug log, not a dmesg log) below could result in the
neighbor handling code removing the proxy addresses from the
interface?

---
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: New device has no
master, continuing without
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Flags change:
+MULTICAST +BROADCAST
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Link 2 added
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: udev initialized link
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: State changed:
pending -> initialized
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Saved original MTU: 1500
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Link state is up-to-date
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: found matching
network '/etc/systemd/network/eno1.network'
Jan 26 09:09:16 net20 systemd-networkd[2584]: Setting
'/proc/sys/net/ipv6/conf/eno1/disable_ipv6' to '0'
Jan 26 09:09:16 net20 systemd-networkd[2584]: Setting
'/proc/sys/net/ipv6/conf/eno1/use_tempaddr' to '0'
Jan 26 09:09:16 net20 systemd-networkd[2584]: Setting
'/proc/sys/net/ipv6/conf/eno1/accept_ra' to '0'
Jan 26 09:09:16 net20 systemd-networkd[2584]: Setting
'/proc/sys/net/ipv6/conf/eno1/proxy_ndp' to '1'
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: KPF: Configuring
proxy NDP address 2607:5300:203:5215:1::1
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: KPF: Configuring
proxy NDP address 2607:5300:203:5215:4::1
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: KPF: Configuring
proxy NDP address 2607:5300:203:5215:5::1
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: KPF: Configuring
proxy NDP address 2607:5300:203:5215:3::1
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: KPF: Configuring
proxy NDP address 2607:5300:203:5215:2::1
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Setting nomaster
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1:
promote_secondaries is unset, setting it
Jan 26 09:09:16 net20 systemd-networkd[2584]: Setting
'net/ipv4/conf/eno1/promote_secondaries' to '1'.
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Setting address
genmode for link
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Failed to read
sysctl property stable_secret: Input/output error
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Setting nomaster done.
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Setting address
genmode done.
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: State changed:
initialized -> configuring
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Bringing link up
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Flags change: +UP
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Link UP
Jan 26 09:09:16 net20 systemd-networkd[2584]: eno1: Started LLDP.
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: ff00::/8, src: n/a, gw: n/a, prefsrc: n/a, scope: global, table:
local, proto: boot, type: unicast
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: fe80::/64, src: n/a, gw: n/a, prefsrc: n/a, scope: global, table:
main, proto: kernel, type: unicast
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Flags change:
+LOWER_UP +RUNNING
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Gained carrier
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Acquiring DHCPv4 lease
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Configuring
address: 66.70.129.136
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Configuring
address: 66.70.129.142
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Configuring
address: 66.70.129.143
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Configuring
address: 2607:5300:203:5215::1
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Setting addresses
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 66.70.129.136/32 (valid forever)
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 66.70.129.136/32, src: n/a, gw: n/a, prefsrc: 66.70.129.136,
scope: host, table: local, proto: kernel, type: local
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 66.70.129.142/32 (valid forever)
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 66.70.129.142/32, src: n/a, gw: n/a, prefsrc: 66.70.129.142,
scope: host, table: local, proto: kernel, type: local
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 66.70.129.143/32 (valid forever)
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 66.70.129.143/32, src: n/a, gw: n/a, prefsrc: 66.70.129.143,
scope: host, table: local, proto: kernel, type: local
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 2607:5300:203:5215::/64, src: n/a, gw: n/a, prefsrc: n/a, scope:
global, table: main, proto: kernel, type: unicast
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 2607:5300:203:5215::1/64 (valid forever)
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: Addresses set
Jan 26 09:09:27 net20 systemd-networkd[2584]: eno1: an address
2607:5300:203:5215::1/64 is not ready
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Flags change:
-LOWER_UP -RUNNING
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Lost carrier
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Removing address
66.70.129.136
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Removing address
66.70.129.143
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Removing address
66.70.129.142
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Removing address
2607:5300:203:5215::1
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: State is
configuring, dropping config
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Forgetting
address: 66.70.129.136/32 (valid forever)
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Forgetting route:
dst: 66.70.129.136/32, src: n/a, gw: n/a, prefsrc: 66.70.129.136,
scope: host, table: local, proto: kernel, type: local
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Forgetting
address: 66.70.129.143/32 (valid forever)
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Forgetting route:
dst: 66.70.129.143/32, src: n/a, gw: n/a, prefsrc: 66.70.129.143,
scope: host, table: local, proto: kernel, type: local
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Forgetting
address: 66.70.129.142/32 (valid forever)
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Forgetting route:
dst: 66.70.129.142/32, src: n/a, gw: n/a, prefsrc: 66.70.129.142,
scope: host, table: local, proto: kernel, type: local
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Forgetting
address: 2607:5300:203:5215::1/64 (valid forever)
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static routes are not configured.
Jan 26 09:09:28 net20 systemd-networkd[2584]: eno1: Forgetting route:
dst: 2607:5300:203:5215::/64, src: n/a, gw: n/a, prefsrc: n/a, scope:
global, table: main, proto: kernel, type: unicast
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Flags change:
+LOWER_UP +RUNNING
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Started LLDP.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Gained carrier
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Acquiring DHCPv4 lease
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Configuring
address: 66.70.129.136
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Configuring
address: 66.70.129.142
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Configuring
address: 66.70.129.143
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Configuring
address: 2607:5300:203:5215::1
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Setting addresses
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 66.70.129.136/32 (valid forever)
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 66.70.129.136/32, src: n/a, gw: n/a, prefsrc: 66.70.129.136,
scope: host, table: local, proto: kernel, type: local
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 66.70.129.142/32 (valid forever)
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 66.70.129.142/32, src: n/a, gw: n/a, prefsrc: 66.70.129.142,
scope: host, table: local, proto: kernel, type: local
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 66.70.129.143/32 (valid forever)
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 66.70.129.143/32, src: n/a, gw: n/a, prefsrc: 66.70.129.143,
scope: host, table: local, proto: kernel, type: local
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 2607:5300:203:5215::/64, src: n/a, gw: n/a, prefsrc: n/a, scope:
global, table: main, proto: kernel, type: unicast
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 2607:5300:203:5215::1/64 (valid forever)
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static addresses are not configured.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Addresses set
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: an address
2607:5300:203:5215::1/64 is not ready
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: DHCPv4 address
51.79.18.21/24 via 51.79.18.254
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Updating address:
51.79.18.21
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 51.79.18.21/24 (valid for 1d)
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): an address 2607:5300:203:5215::1/64 is not ready.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 51.79.18.21/32, src: n/a, gw: n/a, prefsrc: 51.79.18.21, scope:
host, table: local, proto: kernel, type: local
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 51.79.18.255/32, src: n/a, gw: n/a, prefsrc: 51.79.18.21, scope:
link, table: local, proto: kernel, type: broadcast
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 51.79.18.0/24, src: n/a, gw: n/a, prefsrc: 51.79.18.21, scope:
link, table: main, proto: kernel, type: unicast
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 51.79.18.0/32, src: n/a, gw: n/a, prefsrc: 51.79.18.21, scope:
link, table: local, proto: kernel, type: broadcast
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: DHCP: No routes
received from DHCP server: No data available
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Configuring route:
dst: 51.79.18.254/32, src: n/a, gw: n/a, prefsrc: 51.79.18.21, scope:
link, table: main, proto: dhcp, type: unicast
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Configuring route:
dst: n/a, src: n/a, gw: 51.79.18.254, prefsrc: 51.79.18.21, scope:
global, table: main, proto: dhcp, type: unicast
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Received
remembered route: dst: 51.79.18.254/32, src: n/a, gw: n/a, prefsrc:
51.79.18.21, scope: link, table: main, proto: dhcp, type: unicast
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Received
remembered route: dst: n/a, src: n/a, gw: 51.79.18.254, prefsrc:
51.79.18.21, scope: global, table: main, proto: dhcp, type: unicast
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): an address 2607:5300:203:5215::1/64 is not ready.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering
foreign address: fe80::d250:99ff:fed4:2aca/64 (valid forever)
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): an address 2607:5300:203:5215::1/64 is not ready.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Gained IPv6LL
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1:
link_check_ready(): an address 2607:5300:203:5215::1/64 is not ready.
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: fe80::d250:99ff:fed4:2aca/128, src: n/a, gw: n/a, prefsrc: n/a,
scope: global, table: local, proto: kernel, type: local
Jan 26 09:09:29 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: fe80::/128, src: n/a, gw: n/a, prefsrc: n/a, scope: global,
table: local, proto: kernel, type: anycast
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: Remembering
updated address: 2607:5300:203:5215::1/64 (valid forever)
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1:
link_check_ready(): static routes are not configured.
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: Configuring route:
dst: 2607:5300:203:52ff:ff:ff:ff:ff/128, src: n/a, gw: n/a, prefsrc:
n/a, scope: global, table: main, proto: static, type: unicast
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: Configuring route:
dst: n/a, src: n/a, gw: 2607:5300:203:52ff:ff:ff:ff:ff, prefsrc: n/a,
scope: global, table: main, proto: static, type: unicast
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: Setting routes
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 2607:5300:203:5215::1/128, src: n/a, gw: n/a, prefsrc: n/a,
scope: global, table: local, proto: kernel, type: local
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: Remembering route:
dst: 2607:5300:203:5215::/128, src: n/a, gw: n/a, prefsrc: n/a, scope:
global, table: local, proto: kernel, type: anycast
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: Received
remembered route: dst: 2607:5300:203:52ff:ff:ff:ff:ff/128, src: n/a,
gw: n/a, prefsrc: n/a, scope: global, table: main, proto: static,
type: unicast
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: Received
remembered route: dst: n/a, src: n/a, gw:
2607:5300:203:52ff:ff:ff:ff:ff, prefsrc: n/a, scope: global, table:
main, proto: static, type: unicast
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: Routes set
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1:
link_check_ready(): dhcp4:yes dhcp6_addresses:no dhcp_routes:no
dhcp_pd_addresses:no dhcp_pd_routes:no ndisc_addresses:no
ndisc_routes:no
Jan 26 09:09:30 net20 systemd-networkd[2584]: eno1: State changed:
configuring -> configured