Selective sub-net filtering in a pre-boot execution environment (PXE)
View Patent ↗Embodiments of the invention address deficiencies of the art in respect to PXE processing and provide a method, system and computer program product for selective PXE subnet filtering. In an embodiment of the invention, a PXE server subnet filtering method can be provided. The method can include selectively referring a PXE client to different boot logic depending upon at least a portion of a network assigned address for the PXE client. In this regard, selectively referring a PXE client to different boot logic depending upon at least a portion of a network assigned address for the PXE client can include selectively referring a PXE client to a different boot image notification layer (BINL) service providing a different filename for a different network bootstrap program depending upon at least a portion of an Internet protocol (IP) assigned address for the PXE client by a network resident dynamic host control protocol (DHCP) server in response to a previous DHCP request provided by the PXE client.
1. A pre-boot execution environment (PXE) server subnet filtering method in a computer system, the method comprising:
excluding a PXE option from a first address request issued by the PXE client;
broadcasting the first address request to at least one dynamic hog control protocol (DHCP) server and receiving in response an assigned network address;
including a PXE option in a second address request issued by the PXE client along with the assigned network address;
broadcasting the second address request to multiple different PXE servers and receiving in response from a single one of the PXE servers a reference to boot logic depending upon at least a portion of the assigned network address; and,
retrieving and executing the boot logic in the PXE client, the boot logic comprising program code initially only broadcasting a DHCP request and subsequently receiving an IP address assigned by one of the at least one DHCP server, creating a new DHCP request including both a PXE request and the assigned IP address and broadcasting the new DHCP request.
2. The method of claim 1 , wherein broadcasting the second address request comprises:
broadcasting the second address request to multiple different PXE servers and receiving in response from a single one of the PXE servers a reference to a BNL service depending upon at least a portion of the assigned network address;
requesting a path and the name for a network boot program from the BIL service and receiving the path and the name in response; and,
wherein retrieving comprises:
retrieving and executing the network boot program corresponding to the path and the name in the PXE client.
3. A computer program product comprising a computer readable storage medium embodying computer usable program code for pre-boot execution environment (PXE) server subnet filtering, the computer program product comprising:
computer usable program code for excluding a FXE option from a first address request issued by the PXE client;
computer usable program code for broadcasting the first address request to at least one dynamic host control protocol (DHCP) server and receiving in response an assigned network address;
computer usable program code for including a PXE option in a second address request issued by the PXE client along with the assigned network address;
computer usable program code for broadcasting the second address request to multiple different FXE servers and receiving in response from a single one of the PXE servers a reference to boot logic depending upon at least a portion of the assigned network address; and,
computer usable program code for retrieving and executing the boot logic in the PXE client, the boot logic comprising program code
initially only broadcasting a DHCP request and subsequently receiving an IP address assigned by one of the at least one DHCP server, creating a new DHCP request including both a PXE request and the assigned IP address and broadcasting the new DHCP request.