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I am getting an intermittent connection when fresh PXE installing centos 7.5.1804 with digital rebar though I don't believe this has anything to do with the method I am using to install the OS. Works fine when I install Ubuntu so I don't believe this is a hardware issue.

Basically the connection cyclically stays live for very close to one minute then goes off for about 80 seconds.

It seems like it is trying to renegotiate the dhcp connection for some reason though I wouldn't know why and if this is a cause (and how to fix it) or effect of something of something else.

My logs after running journalctl are below. Those IP addresses from chrond link to some site about christian polyamorous society (I know right, 66.228.58.20 if your into that kind of thing), and some basic bootstrap site.

Dec 24 07:16:19 c6100-3 nm-dispatcher[4948]: req:2 'connectivity-change': start running ordered scripts...

Dec 24 07:16:19 c6100-3 chronyd[778]: Source 45.76.244.193 online

Dec 24 07:16:19 c6100-3 chronyd[778]: Source 66.228.58.20 online

Dec 24 07:16:19 c6100-3 chronyd[778]: Source 204.11.201.10 online

Dec 24 07:16:19 c6100-3 chronyd[778]: Source 96.8.121.205 online

Dec 24 07:16:19 c6100-3 nm-dispatcher[4948]: req:2 'connectivity-change': new request (3 scripts)

Dec 24 07:16:19 c6100-3 nm-dispatcher[4948]: req:1 'dhcp4-change' [enp1s0f0]: start running ordered scripts...

Dec 24 07:16:19 c6100-3 nm-dispatcher[4948]: req:1 'dhcp4-change' [enp1s0f0]: new request (3 scripts)

Dec 24 07:16:19 c6100-3 systemd[1]: Started Network Manager Script Dispatcher Service.

Dec 24 07:16:19 c6100-3 dbus[756]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'

Dec 24 07:16:19 c6100-3 systemd[1]: Starting Network Manager Script Dispatcher Service...

Dec 24 07:16:19 c6100-3 dhclient[4938]: bound to 10.1.33.104 -- renewal in 23 seconds.

Dec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7662] manager: NetworkManager state is now CONNECTED_GLOBAL

Dec 24 07:16:19 c6100-3 dbus[756]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freeDec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7652] policy: set 'enp1s0f0' (enp1s0f0) as default for IPv4 routingDec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7645] dhcp4 (enp1s0f0): state changed unknown -> bound

Dec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7645] dhcp4 (enp1s0f0):   domain name 'robcannon.xyz'

Dec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7645] dhcp4 (enp1s0f0):   nameserver '1.1.1.1'

Dec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7644] dhcp4 (enp1s0f0):   lease time 60

Dec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7644] dhcp4 (enp1s0f0):   gateway 10.1.33.1

Dec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7644] dhcp4 (enp1s0f0):   plen 24 (255.255.255.0)

Dec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7644] dhcp4 (enp1s0f0):   address 10.1.33.104

Dec 24 07:16:19 c6100-3 dhclient[4938]: DHCPACK from 10.1.33.1 (xid=0x7d4996f4)

Dec 24 07:16:19 c6100-3 dhclient[4938]: DHCPOFFER from 10.1.33.1

Dec 24 07:16:19 c6100-3 dhclient[4938]: DHCPREQUEST on enp1s0f0 to 255.255.255.255 port 67 (xid=0x7d4996f4)

Dec 24 07:16:19 c6100-3 dhclient[4938]: DHCPDISCOVER on enp1s0f0 to 255.255.255.255 port 67 interval 3 (xid=0x7d4996f4)

Dec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7218] dhcp4 (enp1s0f0): dhclient started with pid 4938

Dec 24 07:16:19 c6100-3 NetworkManager[761]: <info>  [1545635779.7200] dhcp4 (enp1s0f0): activation: beginning transaction (timeout Dec 24 07:14:51 c6100-3 chronyd[778]: Source 96.8.121.205 offline

Dec 24 07:14:51 c6100-3 chronyd[778]: Source 66.228.58.20 offline

Dec 24 07:14:51 c6100-3 chronyd[778]: Source 45.76.244.193 offline

Dec 24 07:14:51 c6100-3 chronyd[778]: Source 204.11.201.10 offline

Dec 24 07:14:51 c6100-3 nm-dispatcher[4909]: req:1 'connectivity-change': start running ordered scripts...

Dec 24 07:14:51 c6100-3 nm-dispatcher[4909]: req:1 'connectivity-change': new request (3 scripts)

Dec 24 07:14:51 c6100-3 systemd[1]: Started Network Manager Script Dispatcher Service.

Dec 24 07:14:51 c6100-3 dbus[756]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'

Dec 24 07:14:51 c6100-3 systemd[1]: Starting Network Manager Script Dispatcher Service...

Dec 24 07:14:51 c6100-3 dbus[756]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freeDec 24 07:14:51 c6100-3 NetworkManager[761]: <info>  [1545635691.8469] manager: NetworkManager state is now CONNECTED_SITE

Dec 24 07:14:19 c6100-3 NetworkManager[761]: <info>  [1545635659.5216] device (enp1s0f0): scheduling DHCPv4 restart in 120 seconds, Dec 24 07:14:19 c6100-3 NetworkManager[761]: <info>  [1545635659.5212] dhcp4 (enp1s0f0): state changed expire -> done

Dec 24 07:14:19 c6100-3 NetworkManager[761]: <info>  [1545635659.5212] dhcp4 (enp1s0f0): canceled DHCP transaction, DHCP client pid Dec 24 07:14:19 c6100-3 NetworkManager[761]: <info>  [1545635659.5131] dhcp4 (enp1s0f0): state changed bound -> expire

Dec 24 07:14:19 c6100-3 dhclient[4833]: DHCPNAK from 10.1.33.2 (xid=0x6699ca46)

Dec 24 07:14:19 c6100-3 dhclient[4833]: DHCPREQUEST on enp1s0f0 to 10.1.33.2 port 67 (xid=0x6699ca46)

Dec 24 07:13:58 c6100-3 sshd[4878]: pam_unix(sshd:session): session opened for user root by (uid=0)

Dec 24 07:13:58 c6100-3 systemd[1]: Starting Session 3 of user root.

Dec 24 07:13:58 c6100-3 systemd[1]: Started Session 3 of user root.

Any help is VERY much appreciated. Thank you.