Apparently the node sets net.ipv4.ip_forward but if the network were restarted then things go sideways. We should set this during installation in a way that's persisted across service restarts and other events.
Fix submitted: https://github.com/openshift/openshift-ansible/pull/2396
Test this issue with openshift-ansible-3.3.24-1 tag, it's working as expected. Setup an ose-3.3 env, after installation, check the current IP forwarding status on node: [root@openshift-156 ~]# sysctl net.ipv4.ip_forward net.ipv4.ip_forward = 1 [root@openshift-156 ~]# grep net.ipv4.ip_forward /etc/sysctl.conf net.ipv4.ip_forward=1 Restart network service and check again: [root@openshift-156 ~]# systemctl restart network [root@openshift-156 ~]# sysctl net.ipv4.ip_forward net.ipv4.ip_forward = 1 Will move bug to verified once openshift-ansible-3.3.24-1 rpm package was included in errata puddle.
Verify this bug with openshift-ansible-3.3.25-1.git.0.56ee824.el7.noarch.rpm After installation, net.ipv4.ip_forward setting is persisted on nodes.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2016:1983