graph "1x3" {
    layout  = "neato";
    overlap = false;
    esep    = "+80";

    node [shape=record, fontname="DejaVu Sans Mono, Book"];
    edge [color="cornflowerblue", penwidth="2", fontname="DejaVu Serif, Book"];

    host [
        label="host | { <mgmt> mgmt | <lan> lan | <wan> wan }",
        pos="1,1!",
        requires="controller"
    ];

    gateway [
        label="{ <mgmt> mgmt | <lan> lan | <wan> wan } | gateway",
        pos="3,1!",
        requires="infix",
    ];

    host:mgmt -- gateway:mgmt [requires="mgmt", color="lightgray"]
    host:lan  -- gateway:lan  [color=black, fontcolor=black, taillabel="192.168.1.0/24"]
    host:wan  -- gateway:wan  [color=red, fontcolor=red, taillabel="203.0.113.0/24"]
}