Hi. We are seeing some strange packet traces on the nodes, and we suspect that it might be a MTU-issue.
According to the documentation ( https://docs.openshift.com/enterprise/3.1/install_config/configuring_sdn.html#configuring-the-pod-network-on-nodes) a "mtu" parameter in node-config.yaml should be reflected on the overlay network settings (tun0). But on my hosts (OSE 3.1) that's not true: master201 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 master202 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 master203 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 infra201 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 infra202 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450 node201 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450 node202 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450 node203 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450 node204 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 node205 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 node206 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 node207 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 node208 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 node209 mtu: 1450 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 [root@master201 ~]# oc version oc v3.1.0.4-16-g112fcc4 kubernetes v1.1.0-origin-1107-g4c8e6f4 BTW: we are using the mutitenant SDN. -- Pelle Research is what I'm doing when I don't know what I'm doing. - Wernher von Braun
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