With the software-based iSCSI implementation, you can use standard NICs to connect your host to a remote iSCSI target on the IP network. The software iSCSI adapter that is built into ESXi facilitates this connection by communicating with the physical NICs through the network stack.
Before you can use the software iSCSI adapter, you must set up networking, activate the adapter, and configure parameters such as discovery addresses and CHAP.
Designate a separate network adapter for iSCSI. Do not use iSCSI on 100Mbps or slower adapters.