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xCAT Network Boot Agent
5efc2fcb60
Instead of keeping only the best IP and PXE offers, store all of them, and pick the best to use just before a request is sent. This allows priority differentiation to work even when lower-priority offers provide PXE options, and improves robustness at sites with broken PXE servers intermingled with working ones: when a ProxyDHCP request times out, instead of giving up, we try the next PXE offer we've received. It also allows us to avoid breaking up combined IP+PXE offers, which can be important with some firewall configurations. This behavior matches that of most vendor PXE ROMs. Store a reference to the DHCPOFFER packet in the offer structure, so that when registering settings after a successful ACK we can register the proxy PXE settings we originally received; this removes the need for a nonstandard duplicate REQUEST/ACK to port 67 of proxy servers like dnsmasq that provide PXE options in the OFFER. Total cost: 450 bytes uncompressed. Signed-off-by: Marty Connor <mdc@etherboot.org> |
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gPXE README File gPXE is an implementation of the PXE specification for network booting, with extensions to allow additional features such as booting via HTTP, iSCSI, and AoE. In generally, gPXE is compatible with the industry-standard PXE specification, and also supports Etherboot .nbi file loading and some additional protocols and features. For more detailed information about gPXE, please visit our project website at: http://etherboot.org/ BUILDING gPXE IMAGE FROM SOURCE If you don't want to install development tools, and have access to the Web, you can get gPXE and Etherboot ROM images made on demand from http://rom-o-matic.net/ If you would like to compile gPXE images from source, here are some tips. We normally compile gPXE images on x86, 32-bit Linux machines. It is possible to also use x86-64 machines. We use gcc compiler options to create 32-bit output. It is important to have the necessary software packages installed. A gcc-based toolchain is required. The following packages (at least) are required: - a gcc tool chain (gcc 3.x or gcc 4.x) - binutils - perl - syslinux - mtools To test your environment, cd to the "src" directory and type: make You should see a lot of output, and when it stops, the "bin" directory should be populated with gPXE images and object files. To learn more about what to build and how to use gPXE, please visit our project website at http://etherboot.org/ , particularly the "howto" section. CONTACTING US Pointers to our project mailing lists are on http://etherboot.org/ Real-time help is often available on IRC on the #etherboot channel of irc.freenode.net.