After updating Oracle Linux 7.3 to 7.4 the device route for the subnet disappears. Everything on the same subnet then gets routed to the gateway instead of using a direct connection from the NIC.
Route table on a 7.3 server (ip route show dev ens160):
default via 192.168.111.1 proto static metric 100
192.168.111.0/24 proto kernel scope link src 192.168.111.85 metric 100
You can see all subnet traffic routed to then link not the gateway.
Route table after upgrading to 7.4 and rebooting:
default via 192.168.111.1 proto static metric 100
Now I am missing the subnet route.
We can add a static route but we have never needed to do this before. Is this a problem with the updated net manager or a change? I reviewed the release notes and I do not see anything about a functionality change in networking routes.
Thanks,
Mike