> On Thu, 16 Jan 2020 15:34:43 +0100, Stephen John Smoogen > <smooge at gmail.com> wrote: > >> On Thu, 16 Jan 2020 at 07:58, Asle Ommundsen <aommundsen at gmail.com> >> wrote: >>> >>> Hi, >>> >>> Tonight I upgraded two CentOS 8 boxes to CentOS 8.1 (1911). Then after >>> a >>> reboot of the first server the network was unavailable. In IPMI console >>> everything except the network was looking good. Network was >>> unreachable. >>> No errors in NetworkManager. I also restarted NetworkManager, but it >>> did >>> not help. Then I discovered that the default gateway suddenly was >>> missing. >>> >>> Then I rebooted the server one more time, but network was still down. >>> >>> Then both myself and a technician in my datcenter was debugging this (I >>> had to wake him up in the middle of the night, costing me a lot of >>> money), >>> without finding any reason for why the default gateway was missing >>> after >>> reboot. >>> >>> Then we rebooted the server a third time, and all of a sudden the >>> problem >>> was gone and the default gateway was back. [...cut...] > >> In order to determine what is going on you need to give a lot more >> information. >> >> 1. How do these boxes get their network information? DHCP or static >> 2. If they are static, what controls the setting of ips: >> NetworkManager or network-scripts >> 3. If they are static, how are they set in >> /etc/sysconfig/network-scripts/ >> 4. Do the files in /etc/sysconfig/network-scripts list a GATEWAY= >> 5. If you are using network-manager, what does nmtui or the graphical >> tool say the gateway or default route is? > > Here is answers to your list. I have anonymized the some of the data: > > 1) Static ip configuration > > 2) This should be NetworkManager. > nmcli output: > > eno1: connected to eno1 > inet4 1.1.1.234/29 > route4 1.1.1.232/29 > route4 0.0.0.0/0 > > eno2: connected to eno2 > inet4 192.168.0.5/24 > route4 192.168.0.0/24 > > [root at server ~]# nmcli d show | grep IP4.GATEWA > IP4.GATEWAY: 1.1.1.1.233 > > 3) > TYPE=Ethernet > PROXY_METHOD=none > BROWSER_ONLY=no > BOOTPROTO=none > DEFROUTE=yes > IPV4_FAILURE_FATAL=yes > IPV6INIT=yes > IPV6_AUTOCONF=yes > IPV6_DEFROUTE=yes > IPV6_FAILURE_FATAL=no > IPV6_ADDR_GEN_MODE=stable-privacy > NAME=eno1 > UUID=1f9ec889-3c64-470a-894b-05543ee44c29 > DEVICE=eno1 > ONBOOT=yes > IPADDR=1.1.1..234 > PREFIX=29 > GATEWAY=1.1.1.233 > IPV6_PRIVACY=no Anything in the logs about what was going on? If you reboot this server again and again, does the problem show up again? Regards, Simon