These are the DHCP options you need for PXE boot to work with SCCM across different networks.
- DHCP Option 66: Boot server hostname or IP address. (sccm.domain.com). If you use hostname, you must use the fully qualified domain name (sccm.domain.com)
- DHCP Option 67: Boot file name. \SMSBoot\x86\wdsnbp.com