<div dir="ltr"><div>Hi </div><div>I have 2 following ethernet profiles at /etc/NetworkManager/system-connections on my development board. One for dynamic ip configuration (my-eth0.connection) and other for link local (my-ll-eth0.connection) as fallback whenever DHCP server is not reachable. I have connected the ethernet from the development board directly to Windows host. And my Windows host doesn't run any DHCP server.</div><div>The test setup is the development board is rebooted every time. Before reboot existing profiles (my-eth0, my-ll-eth0) are deleted as part of board enterprise reset logic. But the observation is that sometimes after reboot fallback happens to link-local profile "my-ll-eth0.connection" and sometimes not. Below are profiles for your references. Please let me know your inputs on this and let me know if I am doing anything wrong.</div><div>Note: Issue is not observed in reboot without deleting profile. -- root@YME34C5F9C5:/etc/NetworkManager/system-connections# cat my-eth0.nmconnection [connection] id=my-eth0 uuid=c5b09a38-d2a9-453a-88e4-8daf073d211e type=ethernet autoconnect-priority=1 interface-name=eth0 [ethernet] [ipv4] dhcp-timeout=10 method=auto [ipv6] addr-gen-mode=stable-privacy method=auto ra-timeout=10 [proxy] ----------------------- root@YME34C5F9C5:/etc/NetworkManager/system-connections# cat my-ll-eth0.nmconnection [connection] id=my-ll-eth0 uuid=cf1769a6-0caa-4ce9-a4df-73f7b545f987 type=ethernet interface-name=eth0 [ethernet] [ipv4] method=link-local [ipv6] addr-gen-mode=stable-privacy method=auto [proxy] ------------------------------ root@YME34C5F9C5:/etc/NetworkManager/system-connections# nmcli con show my-eth0 <a href="http://connection.id">connection.id</a>: my-eth0 connection.uuid: c5b09a38-d2a9-453a-88e4-8daf073d211e connection.stable-id: -- connection.type: 802-3-ethernet connection.interface-name: eth0 connection.autoconnect: yes connection.autoconnect-priority: 1 connection.autoconnect-retries: -1 (default) connection.multi-connect: 0 (default) connection.auth-retries: -1 connection.timestamp: 0 connection.read-only: no connection.permissions: -- connection.zone: -- connection.master: -- connection.slave-type: -- connection.autoconnect-slaves: -1 (default) connection.secondaries: -- connection.gateway-ping-timeout: 0 connection.metered: unknown connection.lldp: default connection.mdns: -1 (default) connection.llmnr: -1 (default) connection.dns-over-tls: -1 (default) connection.wait-device-timeout: -1 802-3-ethernet.port: -- 802-3-ethernet.speed: 0 802-3-ethernet.duplex: -- 802-3-ethernet.auto-negotiate: no 802-3-ethernet.mac-address: -- 802-3-ethernet.cloned-mac-address: -- 802-3-ethernet.generate-mac-address-mask:-- 802-3-ethernet.mac-address-blacklist: -- 802-3-ethernet.mtu: auto 802-3-ethernet.s390-subchannels: -- 802-3-ethernet.s390-nettype: -- 802-3-ethernet.s390-options: -- 802-3-ethernet.wake-on-lan: default 802-3-ethernet.wake-on-lan-password: -- 802-3-ethernet.accept-all-mac-addresses:-1 (default) ipv4.method: auto ipv4.dns: -- ipv4.dns-search: -- ipv4.dns-options: -- ipv4.dns-priority: 0 ipv4.addresses: -- ipv4.gateway: -- ipv4.routes: -- ipv4.route-metric: -1 ipv4.route-table: 0 (unspec) ipv4.routing-rules: -- ipv4.ignore-auto-routes: no ipv4.ignore-auto-dns: no ipv4.dhcp-client-id: -- ipv4.dhcp-iaid: -- ipv4.dhcp-timeout: 10 ipv4.dhcp-send-hostname: yes ipv4.dhcp-hostname: -- ipv4.dhcp-fqdn: -- ipv4.dhcp-hostname-flags: 0x0 (none) ipv4.never-default: no ipv4.may-fail: yes ipv4.required-timeout: -1 (default) ipv4.dad-timeout: -1 (default) ipv4.dhcp-vendor-class-identifier: -- ipv4.dhcp-reject-servers: -- ipv6.method: auto ipv6.dns: -- ipv6.dns-search: -- ipv6.dns-options: -- ipv6.dns-priority: 0 ipv6.addresses: -- ipv6.gateway: -- ipv6.routes: -- ipv6.route-metric: -1 ipv6.route-table: 0 (unspec) ipv6.routing-rules: -- ipv6.ignore-auto-routes: no ipv6.ignore-auto-dns: no ipv6.never-default: no ipv6.may-fail: yes ipv6.required-timeout: -1 (default) ipv6.ip6-privacy: -1 (unknown) ipv6.addr-gen-mode: stable-privacy ipv6.ra-timeout: 10 ipv6.dhcp-duid: -- ipv6.dhcp-iaid: -- ipv6.dhcp-timeout: 0 (default) ipv6.dhcp-send-hostname: yes ipv6.dhcp-hostname: -- ipv6.dhcp-hostname-flags: 0x0 (none) ipv6.token: -- proxy.method: none proxy.browser-only: no proxy.pac-url: -- proxy.pac-script: -- -- root@YME34C5F9C5:/etc/NetworkManager/system-connections#nmcli con show my-ll-eth0 <a href="http://connection.id">connection.id</a>: my-ll-eth0 connection.uuid: cf1769a6-0caa-4ce9-a4df-73f7b545f987 connection.stable-id: -- connection.type: 802-3-ethernet connection.interface-name: eth0 connection.autoconnect: yes connection.autoconnect-priority: 0 connection.autoconnect-retries: -1 (default) connection.multi-connect: 0 (default) connection.auth-retries: -1 connection.timestamp: 0 connection.read-only: no connection.permissions: -- connection.zone: -- connection.master: -- connection.slave-type: -- connection.autoconnect-slaves: -1 (default) connection.secondaries: -- connection.gateway-ping-timeout: 0 connection.metered: unknown connection.lldp: default connection.mdns: -1 (default) connection.llmnr: -1 (default) connection.dns-over-tls: -1 (default) connection.wait-device-timeout: -1 802-3-ethernet.port: -- 802-3-ethernet.speed: 0 802-3-ethernet.duplex: -- 802-3-ethernet.auto-negotiate: no 802-3-ethernet.mac-address: -- 802-3-ethernet.cloned-mac-address: -- 802-3-ethernet.generate-mac-address-mask:-- 802-3-ethernet.mac-address-blacklist: -- 802-3-ethernet.mtu: auto 802-3-ethernet.s390-subchannels: -- 802-3-ethernet.s390-nettype: -- 802-3-ethernet.s390-options: -- 802-3-ethernet.wake-on-lan: default 802-3-ethernet.wake-on-lan-password: -- 802-3-ethernet.accept-all-mac-addresses:-1 (default) ipv4.method: link-local ipv4.dns: -- ipv4.dns-search: -- ipv4.dns-options: -- ipv4.dns-priority: 0 ipv4.addresses: -- ipv4.gateway: -- ipv4.routes: -- ipv4.route-metric: -1 ipv4.route-table: 0 (unspec) ipv4.routing-rules: -- ipv4.ignore-auto-routes: no ipv4.ignore-auto-dns: no ipv4.dhcp-client-id: -- ipv4.dhcp-iaid: -- ipv4.dhcp-timeout: 0 (default) ipv4.dhcp-send-hostname: yes ipv4.dhcp-hostname: -- ipv4.dhcp-fqdn: -- ipv4.dhcp-hostname-flags: 0x0 (none) ipv4.never-default: no ipv4.may-fail: yes ipv4.required-timeout: -1 (default) ipv4.dad-timeout: -1 (default) ipv4.dhcp-vendor-class-identifier: -- ipv4.dhcp-reject-servers: -- ipv6.method: auto ipv6.dns: -- ipv6.dns-search: -- ipv6.dns-options: -- ipv6.dns-priority: 0 ipv6.addresses: -- ipv6.gateway: -- ipv6.routes: -- ipv6.route-metric: -1 ipv6.route-table: 0 (unspec) ipv6.routing-rules: -- ipv6.ignore-auto-routes: no ipv6.ignore-auto-dns: no ipv6.never-default: no ipv6.may-fail: yes ipv6.required-timeout: -1 (default) ipv6.ip6-privacy: -1 (unknown) ipv6.addr-gen-mode: stable-privacy ipv6.ra-timeout: 0 (default) ipv6.dhcp-duid: -- ipv6.dhcp-iaid: -- ipv6.dhcp-timeout: 0 (default) ipv6.dhcp-send-hostname: yes ipv6.dhcp-hostname: -- ipv6.dhcp-hostname-flags: 0x0 (none) ipv6.token: -- proxy.method: none proxy.browser-only: no proxy.pac-url: -- proxy.pac-script: -- ----- </div><div> Thanks </div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">Manjunatha Srinivasan N</div></div></div>