VMkernel TCP/IP Stacks

Reference:

http://www.mindthevirt.com/vmkernel-tcpip-stacks-1080

https://virtualizationreview.com/articles/2015/10/26/configure-multiple-tcpip-stacks-in-vsphere-6.aspx

http://wahlnetwork.com/2016/05/26/vmotion-tcpip-stack-layer-3-vmotion/

3 major TCP/IP stack

One of the primary reasons for creating a separate TCP/IP stack from the default one in many cases is to use a different default gateway

當你需要將 VMware 唔同既 traffic 分開唔同 network 經唔同既 default gateway 走就需要 configure TCP/IP stack

Default TCP/IP stack

Management traffic between ESXi hosts and vCenter server are considered as the default TCP/IP stack. Also, host related traffic like vMotion, NFS/iSCSI storage, HA and vSphere FT are part of it.

vMotion TCP/IP stack

By creating a VMkernel port on the vMotion TCP/IP stack you can isolate vMotion traffic to this stack. By doing so, vMotion traffic will be disabled on the default TCP/IP stack. The vMotion TCP/IP stack is used for live VM migrations.

VMware recommends configuring a separate vMotion TCP/IP stack and isolate management traffic from vMotion traffic.

依個 vMotion TCP/IP stack 係 for Layer 3 vMotion, 原本既 vMotion traffic 只係 Layer 2 only. 要 enable 左 vMotion TCP/IP stack 先可以做到 Layer 3 vMotion.

Provisioning TCP/IP stack

The provisioning TCP/IP stack is used for cold VM migration, cloning and snapshotting traffic. In case of a long-distance vMotion (new in vSphere 6), NFC (network file copy) traffic can be configured to use the provisioning TCP/IP stack. Setting up a provisioning TCP/IP stack is useful when you want to isolate this traffic from other TCP/IP stacks. A dedicated provisioning TCP/IP stack is common in VDI environments and in setups with frequent VM snapshots.

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