diff --git a/justfile b/justfile
index 6a0621e..f84ec2e 100644
--- a/justfile
+++ b/justfile
@@ -31,9 +31,25 @@ peer-cli-build:
 peer-cli-image:
   docker build -f crates/lanspread-peer-cli/Dockerfile -t lanspread-peer-cli:dev .
 
-peer-cli-run NAME:
+# macvlan: each peer container gets its own MAC/IP on the real LAN.
+# Override on the command line if your LAN differs, e.g.
+#   just LANSPREAD_PARENT_IFACE=enp4s0 LANSPREAD_SUBNET=10.0.0.0/24 LANSPREAD_GATEWAY=10.0.0.1 peer-cli-net
+LANSPREAD_NET := "lanspread"
+LANSPREAD_PARENT_IFACE := "eth0"
+LANSPREAD_SUBNET := "192.168.1.0/24"
+LANSPREAD_GATEWAY := "192.168.1.1"
+
+peer-cli-net:
+  docker network inspect {{LANSPREAD_NET}} >/dev/null 2>&1 || \
+    docker network create -d macvlan \
+      --subnet={{LANSPREAD_SUBNET}} \
+      --gateway={{LANSPREAD_GATEWAY}} \
+      -o parent={{LANSPREAD_PARENT_IFACE}} \
+      {{LANSPREAD_NET}}
+
+peer-cli-run NAME: peer-cli-net
   mkdir -p "target/peer-cli/{{NAME}}/state" "target/peer-cli/{{NAME}}/games"
-  docker run --rm --init --network host --name "lanspread-peer-cli-{{NAME}}" -i \
+  docker run --rm --init --network {{LANSPREAD_NET}} --name "lanspread-peer-cli-{{NAME}}" -i \
     -v "$PWD/target/peer-cli/{{NAME}}/state:/state" \
     -v "$PWD/target/peer-cli/{{NAME}}/games:/games" \
     lanspread-peer-cli:dev \