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
