@george1421 said in Dell Optiplex 3080 - UEFI - PXE Boot E-21: Remote boot cancelled.:

Side note: If your network doesn’t have a dhcp server I would personally use isc-dhcp server on your fog server over dnsmasq. I would use dnsmasq if you have a dhcp server run by someone else and can’t update settings. In this case dnsmasq would supplement your unchangeable dhcp server.

THANK YOU!

I set up isc-dhcp and it’s working like a charm.

For any future people reading:
I modified /etc/dhcp/dhcp.conf with the below config.
I disabled dnsmasq. systemctl stop dnsmasq.service
I started isc-dhcp service dhcpd start
I tsuccessfully PXE booted with my Dell 3080 a few times.
I permanently disabled dnsmasq. systemctl disable dnsmasq
I set isc-dhcp to start automatically. systemctl enable dhcpd

option space PXE;
option PXE.mtftp-ip    code 1 = ip-address;
option PXE.mtftp-cport code 2 = unsigned integer 16;
option PXE.mtftp-sport code 3 = unsigned integer 16;
option PXE.mtftp-tmout code 4 = unsigned integer 8;
option PXE.mtftp-delay code 5 = unsigned integer 8;
option arch code 93 = unsigned integer 16; # RFC4578

use-host-decl-names on;
ddns-update-style interim;
ignore client-updates;
next-server 192.x.x.7;
authoritative;


subnet 192.x.x.0 netmask 255.255.255.0 {
    option subnet-mask 255.255.255.0;
    range dynamic-bootp 192.x.x.200 192.x.x.254;
    default-lease-time 21600;
    max-lease-time 43200;
    option domain-name-servers 192.x.x.7;
    option routers 192.x.x.7;
 
    class "UEFI-32-1" {
    match if substring(option vendor-class-identifier, 0, 20) = "PXEClient:Arch:00006";
    filename "i386-efi/ipxe.efi";
    }

    class "UEFI-32-2" {
    match if substring(option vendor-class-identifier, 0, 20) = "PXEClient:Arch:00002";
     filename "i386-efi/ipxe.efi";
    }

    class "UEFI-64-1" {
    match if substring(option vendor-class-identifier, 0, 20) = "PXEClient:Arch:00007";
     filename "ipxe.efi";
    }

    class "UEFI-64-2" {
    match if substring(option vendor-class-identifier, 0, 20) = "PXEClient:Arch:00008";
    filename "ipxe.efi";
    }

    class "UEFI-64-3" {
    match if substring(option vendor-class-identifier, 0, 20) = "PXEClient:Arch:00009";
     filename "ipxe.efi";
    }

    class "Legacy" {
    match if substring(option vendor-class-identifier, 0, 20) = "PXEClient:Arch:00000";
    filename "undionly.kkpxe";
    }

}