My Ubuntu Server (18.04) will suddenly lose all internet connection, after running fine for a few minutes to a few hours, can't ping 184.108.40.206 or hostnames. Local network works fine.
It happens with both DHCP and static IP in /etc/netplan/50-cloud-init.yaml
Rebooting the server doesn't fix anything. Only rebooting the router restores internet.
Weirdly, DHCP works, and I will successfully get IP from my router, upon reboot or restarting network on the server.
running ifconfig -a gives following on my wired connection. (I have a ton of other interfaces, that I left out, from having docker running on the server)
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.99 netmask 255.255.0.0 broadcast 192.168.255.255 inet6 fe80::3e97:eff:fe3b:f588 prefixlen 64 scopeid 0x20<link> ether 3c:97:0e:3b:f5:88 txqueuelen 1000 (Ethernet) RX packets 286557 bytes 39798935 (39.7 MB) RX errors 0 dropped 63 overruns 0 frame 0 TX packets 407440 bytes 427684619 (427.6 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 20 memory 0xf2500000-f2520000
And ethtool enp0s25 gives:
Settings for enp0s25: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on MDI-X: on (auto) Cannot get wake-on-lan settings: Operation not permitted Current message level: 0x00000007 (7) drv probe link Link detected: yes
I'm unfortunately not very strong in the internals of linux/ubuntu to know how to troubleshoot this issue better. There are no indications in the logs in my cockpit interface.
I've had the exact same networking setup running fine on a ubuntu desktop for months - same router, routersetup and switches/cables.
Can anyone point me in the right direction?