While server re-image you would need to make a note of existing network configuration settings and then manually complete the configuration once the server is completed with OS Deployment. This is bit uneasy task and Sometimes, this is more tough while using ILO.

Therefore, it is good to use command to backup and restore the settings. This should complete the task in seconds.

Use the following command to backup your network configuration:
netsh interface dump > netcfg.dat

Use the following command to restore your network configuration:
netsh exec netcfg.dat