ungleich-graphviz/ipv4-nat.dot

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digraph G {
node [ shape=box ]
label="Standard IPv4 NAT"
v4lan [ label="IPv4 LAN\n192.168.x.y/24" ]
router [ label="Router/Firewall\nPublic IP address" ]
v4internet [ label="IPv4 Internet\n0.0.0.0/0" ]
v4lan->v4internet [ label="Connects via NAT" style=dashed ]
v4lan->router [ label="Connects via default route" ]
router->v4internet [ label="Masquerades 192.168.x.y\nto public IP address" ]
}