If you move your USB drive between Server A (Intel NIC) and Server B (Realtek NIC), ESXi will fail to boot due to missing drivers. To solve this, you need to create a custom ISO with (ESXi-Customizer). This allows you to pack the net55-r8168 driver into the installation. Without this, your "portable" ESXi will only work on servers with identical NICs.
How to Download and Create a Portable ESXi 7.0 ISO Whether you are setting up a home lab or deploying to remote servers, having a portable ESXi 7.0 installer esxi 70 download iso portable
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