digraph G {
    Start [shape=doubleoctagon];
    ProxyDHCP [label="Offer ProxyDHCP"];
    PXE [label="Send PXE boot config"];
    TFTP [label=< Send iPXE<br/>(TFTP) >];
    ProxyDHCP_Ipxe [label=< Offer ProxyDHCP<br/>(to iPXE) >];
    HTTP_Ipxe_Script [label=< Send iPXE boot script<br/>(HTTP) >];
    HTTP_Kernel [label=< Send kernel<br/>(HTTP) >];
    HTTP_Initrd [label=< Send initrd(s)<br/>(HTTP) >];
    Booted [shape=doubleoctagon];

    Start -> ProxyDHCP [label=< <i>DHCP request</i> >, fontsize=11];
    ProxyDHCP -> PXE [label=< <i>PXE request</i><br/><i>(UEFI only)</i> >, fontsize=11];
    ProxyDHCP -> TFTP [label=< <i>TFTP request</i><br/><i>(BIOS only)</i> >, fontsize=11];
    PXE -> TFTP [label=< <i>TFTP request</i> >, fontsize=11];
    TFTP -> ProxyDHCP_Ipxe [label=< <i>DHCP request</i><br/><i>(from iPXE)</i> >, fontsize=11];
    ProxyDHCP_Ipxe -> HTTP_Ipxe_Script [label=< <i>Request boot script</i> >, fontsize=11];
    HTTP_Ipxe_Script -> HTTP_Kernel [label=< <i>Request kernel</i> >, fontsize=11];
    HTTP_Kernel -> HTTP_Initrd [label=< <i>Request initrd(s)</i> >, fontsize=11];
    HTTP_Initrd -> Booted;
}