feat: show IOL-style interface names on iol-runner ports

Name ports after the IOL interface they map to (Ethernet0/0, one 4-port
unit per adapter range) via the _get_container_ifname override point, so
the GNS3 UI matches the IOS CLI. Display only — the flat adapter number
remains the socket index.

docs/features/iol-runner-docker.md

@@ -103,7 +103,7 @@ API docs for the auth flow), or in the Web UI under
 | `extra_volumes` | `["/config"]` | `/tmp/run` is auto-added. **Never add `/tmp`** — it would persist the socket directory into the projects tree and uBridge would reject the too-long AF_UNIX path. |
 | `memory` | optional; `0` (default) = no cap | Unset works — Docker applies no limit. When you do set a cap, keep it at IOL memory + ~512 MB, or the cgroup OOM-killer shoots the router. |
 | `console_type` | `telnet` | The runner muxes the IOS console onto PID 1 stdio; `docker_exec` is not needed. |
-| `adapters` | multiple of 4 | IOL port granularity; interfaces are `Ethernet0/0`-style. |
+| `adapters` | multiple of 4 | IOL port granularity. Ports are shown as `Ethernet0/0`-style (one 4-port unit per adapter range), matching the IOS CLI. |
 
 ### Verify
 

gns3server/compute/docker/iol_docker_vm.py

@@ -105,6 +105,15 @@ class IOLDockerVM(VendorDockerVM):
                 volumes.append(needed)
         return volumes
 
+    def _get_container_ifname(self, adapter_number):
+        """
+        Override: name ports after the IOL interface they map to
+        (Ethernet0/0, Ethernet0/1, … — a new 4-port unit every four
+        adapters), so what the GNS3 UI shows matches the IOS CLI. Wiring is
+        unaffected: the flat adapter number remains the socket index.
+        """
+        return f"Ethernet{adapter_number // 4}/{adapter_number % 4}"
+
     async def start(self):
 
         await self._prepare_iol_runtime()

tests/compute/docker/test_iol_docker_vm.py

@@ -177,6 +177,20 @@ def test_iol_memory_knob(compute_project, manager):
     assert vm._iol_memory == 2048
 
 
+# ---------------------------------------------------------------------------
+# Port naming
+# ---------------------------------------------------------------------------
+
+def test_ports_are_named_after_iol_interfaces(compute_project, manager):
+
+    vm = _make_vm(compute_project, manager, adapters=8)
+    assert vm._get_container_ifname(0) == "Ethernet0/0"
+    assert vm._get_container_ifname(3) == "Ethernet0/3"
+    # the second 4-port unit starts its own slot numbering
+    assert vm._get_container_ifname(4) == "Ethernet1/0"
+    assert vm._get_container_ifname(7) == "Ethernet1/3"
+
+
 # ---------------------------------------------------------------------------
 # create()
 # ---------------------------------------------------------------------------