TCP/IP stacks provide flexibility in the VMkernel interface design by allowing you to apply specific DNS and default gateway configurations to a VMkernel interface on a host.
There are three preconfigured TCP/IP stacks:
Custom TCP/IP stacks can be used to handle the network traffic of other applications and services, which may require separate DNS and default gateway configurations.
Create a custom TCP/IP stack on an ESXi host.
Configure DNS, Default Gateway, and Advanced settings on TCP/IP stack.
Assign TCP/IP stack to a VMkernel adapter.