UEFI-PXE-Boot (Asus t100 Tablet)

[K.Hays]

@Wayne-Workman I can attempt to update the firmware, but I feel like that probably isn’t the issue. We have an HP laptop that we put into UEFI mode to help us troubleshoot and it is doing the same thing as the tablets, and it’s not using a USB adapter.

[Junkhacker]

and you’ve been able to use fog with non-uefi systems prior to these tests with uefi, right?

[Wayne Workman]

@K.Hays Well, the problem you’re describing isn’t a fog problem. It’s a firmware or adapter or network issue. You’re not even getting to the point of communicating with the fog server at all.

[Wayne Workman]

@K.Hays said in UEFI-PXE-Boot (Asus t100 Tablet):

all other computers work just fine to image.

@Junkhacker

[K.Hays]

@Wayne-Workman I am currently updating the firmware. If it is a network issue as you’re thinking, could it be caused by the fact that we’re running a Sever 2008 DHCP?

[K.Hays]

@Wayne-Workman Firmware update was ineffective.

[Junkhacker]

@K.Hays well, i know that you can get BIOS and UEFI to coexist and work with Windows 2012 server or a linux DHCP, but you should be able to get BIOS or UEFI (but not both at the same time) to work on Windows 2008 server as DHCP. I’d like to see the exact configuration you have the server set to, is it anything but options 66/67?

[K.Hays]

@Junkhacker What exactly do you mean by that?

[Wayne Workman]

@K.Hays He’s talking about your dhcp server’s scope options. Option 066 should already be correct as you said fog works for other computers. Option 067 needs set to ipxe.efi for this device only, or to snponly.efi @Scott-Adams hit on this point earlier.

It might be worthwhile to run wireshark on the DHCP server to see if it’s even getting a request for DHCP from the device. Also, what are you connecting to as far as the network goes? We know you’re using the adapter, but can you put a dumb-switch (aka a mini-switch) between the adapter and the rest of the network and see what that does?

[Sebastian Roth]

@K-Hays said:

>>Start PXE over IPv4

This is way before any kernel options and even before iPXE binaries are being loaded. To me it seems like it does not get an IP via DHCP. Wonder if it does send a DHCP discovery request at all?!

The only thing that can help is wireshark/tcpdump I suppose. Are you aware on how to use those tools? Please take a packet dump and upload here to the forum.

[george1421]

@Sebastian-Roth I agree here. The image below with starting ipxv4 indicates that the firmware IS seeing that the network interface is pxe bootable (otherwise no boot option). And it is attempting to init it. I would go the tcpdump route if the FOG server and target computer is on the same subnet/broadcast domain.

with this command tcpdump -w output.pcap port 67 or port 68 that would be executed on your FOG server and then attempt to boot the target computer. Stop the tcpdump program after your target computer errors out. Then upload the pcap file here.

[K.Hays]

@george1421 said in UEFI-PXE-Boot (Asus t100 Tablet):

tcpdump -w output.pcap port 67 or port 68

When i run this command i get “tcpdump: no suitable device found”
Tcpdump is installed, and i can run it with just the tcpdump command, but this specific line is not working.

[Quazz]

@K.Hays try

sudo tcpdump -w issue.pcap -i eth0

(make sure the interface is specified correctly there)

[george1421]

@Quazz just for clarity you also need the filter part in addition to the interface selection.

[K.Hays]

@Quazz Thanks, i rebooted and was able to run the previous command.

[Quazz]

@george1421 You can, but you could also filter afterwards so it doesn’t matter much imo.

[george1421]

@Quazz said in UEFI-PXE-Boot (Asus t100 Tablet):

@george1421 You can, but you could also filter afterwards so it doesn’t matter much imo.

The issue is without the filter part you will collect all broadcast traffic as well as unicast traffic to the device where you run tcpdump. This maybe too much to filter through (i.e. looking for a needle in the haystack). Also by only capturing the specific traffic there is little concern about other traffic leaking private info out if the pcap file is posted here.

Just for clarity the command should be this

sudo tcpdump -w issue.pcap -i eth0 port 67 or port 68

Depending on the flavor of linux you are running you may need the sudo command (which now that I think about it could have been the root cause of the interface not being found).

[Wayne Workman]

@K.Hays Please try to re-upload… wireshark is saying it’s damaged/corrupt.

[george1421]

@K.Hays Just so I’m looking at the correct dhcp request (I think I see it already) what is the mac address of this device?

If its the one I think I see it is a uefi device with a IE32 arch.

Also can you confirm that your dhcp server has an 10.40.0.x IP address?

[K.Hays]

@george1421 Would you need the mac address of the adapter or the tablet itself?
The mac adress of the adapter would be 9c:eb:e8:2b:7c:b1
Also the dhcp server does not have a 10.40.0.x address. it would be 10.100.0.x