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Add note on MTU in network troubleshooting

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Sebastiaan van Steenis
2019-04-03 12:51:20 -07:00
committed by Denise
parent 8a1bf7c9af
commit 8f25346de2
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content/rancher/v2.x/en/troubleshooting/networking/_index.md
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@@ -77,6 +77,16 @@ NODE1 cannot reach NODE3
Cleanup the alpine DaemonSet by running `kubectl delete ds/overlaytest`.
### Check if MTU is correctly configured on hosts and on peering/tunnel appliances/devices
When the MTU is incorrectly configured (either on hosts running Rancher, nodes in created/imported clusters or on appliances/devices in between), error messages will be logged in Rancher and in the agents, similar to:
* `websocket: bad handshake`
* `Failed to connect to proxy`
* `read tcp: i/o timeout`
See [Google Cloud VPN: MTU Considerations](https://cloud.google.com/vpn/docs/concepts/mtu-considerations#gateway_mtu_vs_system_mtu) for an example how to configure MTU correctly when using Google Cloud VPN between Rancher and cluster nodes.
### Resolved issues
#### Overlay network broken when using Canal/Flannel due to missing node annotations