To configure a DHCP server for installation on EFI-based systems, specify filename "/bootx64.efi" instead of filename "/pxelinux.0" in the dhcpd.conf file, where /bootx64.efi is the directory to which you copied the EFI boot images when setting up the TFTP server.
Acronis Pxe Server Download
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For a PXE server to respond to a PXE request, the request must be able to transverse routers to communicate with PXE servers on other subnets. PXE uses the DHCP option fields to pass information. Therefore having the PXE server in the routers IP helper table helps make sure that the DHCP packets are forwarded to the PXE server so the PXE server can respond correctly.
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I have an Acronis Snap Deploy 4 PXE Server hosted on my Microsoft Windows Server 2008 R2 machine, however when I connect the PXE-Client to the server I get an address from DHCP but I get a PXE - E32: TFTP Open timeout error.
The IP address of my Windows Server is 192.168.103.1 and all clients are on the same subnet as the server. However I still receive the same TFTP open timeout error. The PXE Server shows an address of 169.254.85.114 but I don't know where or how to change that setting either. The Acronis software does not come with so many options.
It sounds like my pxe client can't reach the tftp server.On my windows server I opened the command window and keyed in "netstat -anmore" and look through the list for UDP service that contains either 0.0.0.0:69 or the IP address of my server:69. and I could not find where the tftp service is running. I then checked the windows firewall to ensure that I have this exception and all seems well.
I don't know acronis, but I do know how PXE booting works. Also I made sure that my clients were on the same subnet as my acronis server, just to eliminate any router issue. The goal here is to get it to boot the first time, then we can work with the settings.
Umm.. not off the top of my head lol. I can't think of what would cause that. You're remote connecting to this server using TeamViewer right? So it's not that the server isn't communicating at all... I'm confused as to why that's happening.
At this point, the basic PXE boot is done. There will be additional interaction between the client and the PXE server, but that is decided by the implementation of the NBP. In the case of the WDS NBP implementation, it will ask for the path of a custom boot file (pxeboot.com or bootmgfw.efi), it will download that and run it. That custom boot file will then download the boot WIM and other files needed by Windows PE.
Those eight steps mentioned above normally works as long as the broadcast from the client can get to the servers. That should not be a problem when the client and the servers are on the same network. But what if the client and servers are on different networks? How will the client get an IP address from the DHCP server?
The answer is in the configuration of the routers. They need to be able to route the client requests from the network of the client to the network of the DHCP server. One such simple router rule is the "ip helper." This simply tells the router to forward the DHCP requests to the known IP address of the DHP server.
But what about the PXE requests? Simple - configure the routers to forward the client request to the PXE server - just like you do with the DHCP server. There is no other skill to learn. It is the same thing that you already know how to do and that you have already done. This time, you just need to do it for another server, the PXE server.
Even though there is a very, very simple solution, you will see administrators using an alternative route. This involves configuring the DHCP server to respond to the PXE requests. The rational is that the client request will always get to the DHCP server (otherwise, clients will never get IP addresses), so, let the DHCP server masquerade as a PXE server. The DHCP server will respond to the client and tell it that it is a PXE server ('PXEClient' on Option 60). It will also respond to the client with path to the network boot program (Option 67).
The DHCP server can fool most client firmware in this manner, but not all. Some firmware are too trusting. When it is time to download the boot files, it will try to download them from the DHCP server. After all, the DHCP server did say that IT IS the PXE server. This will of course fail - the DHCP server does not have any boot files.
Not only are the file names different, the folders are also different depending on the PXE server. For example, in WDS, the folder is 'Boot.' In SCCM/WDS, the folder is 'SMSBoot.' In the WDS-less SCCM, the folder is 'SMSBoot\package-ID.' In Linux, it can be anything.
You could program your DHCP server. Add logic there to detect the client architecture and firmware. It is not trivial work, and it does not make sense. The PXE server type is also something that the DHCP will not be able to programmatically determine. There is very little that you can accomplish here.
What if you have multiple PXE servers? Using multiple PXE server is a common practice for load-balancing. In a diverse environment, it is also common to find Windows, Linux and Router PXE servers all co-existing.
In the IP helper world, you simply add an IP helper entry for each PXE server. You can add as many as you need or as many as you want. Yes boss. For the load-balancing case, PXE servers can be up or down in a group, and you don't have to do any additional configuration. For the diverse environment case, the different PXE servers can selectively choose to respond to the clients that they recognize.
This is problematic in some UEFI settings because the client may never attempt to boot from the hard drive once it has been instructed to start a network boot and the network boot fails (e.g., there is not task sequence deployment for the client). This is also problematic for mixed-OS environments. Your Linux machine would be instructed by the DHCP server to download and run the Windows network boot program.
In the IP helper world, the true PXE server decides whether or not it will respond and serve a network boot file. In the Configuration Manager case, it will only respond if there is a task sequence deployed to the client.
Your network administrator just needs to add that one single line of 'IP helper' router configuration that points to your PXE server. It is next to the configuration line that points to the DHCP server.
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