feat(hack): Add script for venv-based virtual network

hack/make-interfaces.sh

@@ -0,0 +1,27 @@
+#!/bin/bash -ex
+
+# Create a venv-based virtual network for testing, consisting of:
+#
+# - venv0: Interface for the DHCP server (static address: 10.0.0.254/24)
+# - venv1: Interface for DHCP client
+# - br-dhcp: A bridge for communication between these interfaces
+
+BR=br-dhcp
+SERVERADDR="10.0.0.254/24"
+
+brctl delbr $BR
+brctl addbr $BR
+
+for i in {0..1}; do
+    IFNAME="veth${i}"
+    PEERNAME="${IFNAME}s"
+
+    ip link add "$IFNAME" type veth peer name "$PEERNAME"
+    ip link set "$IFNAME" up
+    ip link set "$PEERNAME" up
+
+    brctl addif $BR "$PEERNAME"
+done
+
+ip addr add dev veth0 "$SERVERADDR"
+ip link set "$BR" up