UPDATE: I think that following issue may have been caused by my ISP or router unable to connect internet properly. Internet was unavailable. It started working now. Though i still think that the warning messages should have been more clear in that case.
Hello,
i hope someone can help me. My main PC with Manjaro is without internet connection.
$ uname -r
5.10.2-2-MANJARO
$ nmcli
enp0s20u5u3: connecting (getting IP configuration) to Wired connection 2 "Realtek RTL8153" ethernet (r8152), 00:**:**:**:**:**, hw, mtu 1500
But the DHCP timeout:
led 21 10:30:31 me avahi-daemon[504]: Interface enp3s0.IPv6 no longer relevant for mDNS.
led 21 10:30:31 me avahi-daemon[504]: Leaving mDNS multicast group on interface enp3s0.IPv6 with address fe80:b:c:d.
led 21 10:30:31 me avahi-daemon[504]: Withdrawing address record for fe80:
led 21 10:30:31 me NetworkManager[562]: [1611221431.8468] device (enp3s0): state change: failed → disconnected (reason ‘none’, sys-iface-state: ‘managed’)
led 21 10:30:31 me NetworkManager[562]: [1611221431.8465] device (enp3s0): Activation: failed for connection ‘Wired connection 1’
led 21 10:30:31 me NetworkManager[562]: [1611221431.8451] manager: NetworkManager state is now CONNECTED_LOCAL
led 21 10:30:31 me NetworkManager[562]: [1611221431.8445] device (enp3s0): state change: ip-config → failed (reason ‘ip-config-unavailable’, sys-iface-state: ‘managed’)
led 21 10:30:31 me NetworkManager[562]: [1611221431.8444] dhcp4 (enp3s0): state changed unknown → timeout
led 21 10:30:31 me NetworkManager[562]: [1611221431.8444] dhcp4 (enp3s0): request timed out…
led 21 10:29:50 me dbus-daemon[506]: [system] Activation via systemd failed for unit ‘dbus-org.freedesktop.resolve1.service’: Unit dbus-org.freedesktop.resolve1.service not found.
led 21 10:29:50 me dbus-daemon[506]: [system] Activating via systemd: service name=‘org.freedesktop.resolve1’ unit=‘dbus-org.freedesktop.resolve1.service’ requested by ‘:1.6’ (uid=0 pid=562 comm="/usr/bin/NetworkManager --no-daemon ")
led 21 10:29:46 me avahi-daemon[504]: Registering new address record for fe80:
led 21 10:29:46 me avahi-daemon[504]: New relevant interface enp3s0.IPv6 for mDNS.
led 21 10:29:46 me avahi-daemon[504]: Joining mDNS multicast group on interface enp3s0.IPv6 with address fe80:
led 21 10:29:46 me NetworkManager[562]: [1611221386.6566] dhcp4 (enp3s0): activation: beginning transaction (timeout in 45 seconds)
led 21 10:29:46 me NetworkManager[562]: [1611221386.6550] device (enp3s0): state change: config → ip-config (reason ‘none’, sys-iface-state: ‘managed’)
NetworkManager-dispatcher.service enabled disabled
NetworkManager-wait-online.service enabled disabled
NetworkManager.service enabled disabled
$ inxi -N Network: Device-1: Intel Wireless 3160 driver: iwlwifi Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 Device-3: Realtek RTL8153 Gigabit Ethernet Adapter type: USB driver: r8152
$ pamac search networkmanager|grep Installed && pamac search dhc|grep Installed
networkmanager-vpnc [Installed] 1.2.7dev+20+gdca3aea-2 extra
networkmanager-pptp [Installed] 1.2.9dev+10+gb41b0d0-2 extra
networkmanager-openvpn [Installed] 1.8.12-1 extra
networkmanager-openconnect [Installed] 1.2.7dev+49+gc512d5a-1 extra
networkmanager [Installed] 1.26.4-1 extra
dhcpcd [Installed] 9.3.4-1 core
dhclient [Installed] 4.4.2-2 extra
I have already tried different network card (USB one) and also tried reboot. And connecting RJ45 to a child router. Other computers works in same router/s. Please which commands to try?
WiFi interface is working to connect the router & internet.
Thank you for sharing! 
