Following Scenario: A additional VMkernel port is required to communicate via L3 to a backup device. My vmk adapter needs to talk to the backup device via  as gateway.

As our management vmk is on a different network we need to create a new tcp/ip stack for this communication. This can be done via esxcli:

esxcli network ip netstack add -N "BRS"

Now we can see the new stack created and we can create a vmk for it.

Now as final step we need to add a manual route, again via esxcli:

esxcli network ip route ipv4 add --gateway --network