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Update kubernetes-network-encryption.md 

Added MTU instruction per @ctelfer
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Anne Henmi 2018-09-12 14:06:18 -06:00 committed by GitHub
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ee/ucp/kubernetes/kubernetes-network-encryption.md
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@ -31,6 +31,24 @@ Kubernetes Network Encryption is supported for the following platforms:
* Only supported when using UCP’s default Calico CNI plugin
* Supported on all Docker Enterprise supported Linux OSes
## Configuring MTUs
Before deploying the SecureOverlay components one must ensure that Calico is configured so that the IPIP tunnel
MTU leaves sufficient headroom for the encryption overhead. Encryption adds 26 bytes of overhead but every IPSec
packet size must be a multiple of 4 bytes. IPIP tunnels require 20 bytes of encapsulation overhead. So the IPIP
tunnel interface MTU must be no more than “EXTMTU - 46 - ((EXTMTU - 46) modulo 4)” where EXTMTU is the minimum MTU
of the external interfaces. An IPIP MTU of 1452 should generally be safe for most deployments.
Changing UCP’s MTU requires updating the UCP configuration. This process is described (here)[/ee/ucp/admin/configure/ucp-configuration-file].
The user must update the following values to the new MTU:
[cluster_config]
...
calico_mtu = "1452"
ipip_mtu = "1452"
...
## Configuring SecureOverlay
Once the cluster nodes’ MTUs are properly configured, deploy the SecureOverlay components using the following YAML file to UCP: