PXE boot option 66 not passed to client

[den77]

Hi there. I'm having trouble with setting up a PXE-server. Hopefully someone can help me with this.

I want the OpenWRT dhcp-server (192.168.77.3) to point a PXE-client to a boot file on a TFTP-server (192.168.77.11). I tried setting both options 66 and 67 in the LuCI webinterface:

Now, when I boot the client, I get this:

PXE boot over IPv4
Station IP address is 192.168.77.21
Server IP address is 192.168.77.3
NBP filename is BOOTX64.EFI
NBP filesize is 0 bytes
PXE-E99 unexpected network error

Station IP & filename seem to be ok, but it doesn't get the correct TFTP-server address. It just gets the OpenWRT router IP.

Does anyone have an idea of what I'm doing wrong or how to fix it?

[lleachii]

@den77

but it doesn't get the correct TFTP-server address.

• Who says?
• Did you actually look at the DHCP requests and replies via a software e.g. Wireshark?

[den77]

Ok, that is an assumption. I’ll see if I can use wireshark as you suggested.

Edit: Looks like it does send the correct server host name specified in option 66. Next server IP is 77.3 though. I understood that the Next server IP should be the TFTP server?

Am I missing something here?

Btw, thanks for pointing me to Wireshark, great software!

[trendy]

@den77

Next server IP is 77.3 though. I understood that the Next server IP should be the TFTP server?

No, it is the dhcp server address.

Is the filename on the boot server really all in upper case letters?

[anon50098793]

dnsmasq / uci seems to not support boot sections anymore?... ( adding anyway )

anyway... if you lookup ssh... you can run this;

echo 'dhcp-boot=BOOTX64.EFI,192.168.77.11,192.168.77.11' >> /etc/dnsmasq.conf
/etc/init.d/dnsmasq restart

( efi / multi arches is tricky though... after basic testing you really need to either match via 'tag' or PXE-ARCH )

[den77]

Great! Thank you very much.

I don't have a working PXE-boot yet, but it did download the NBP file, so that's progress!