diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests/AbServerFixture.cs b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests/AbServerFixture.cs
index fe17ff9..4213db2 100644
--- a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests/AbServerFixture.cs
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests/AbServerFixture.cs
@@ -8,7 +8,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests;
/// Reachability probe for the ab_server Docker container (libplctag's CIP
/// simulator built via Docker/Dockerfile) or any real AB PLC the
/// AB_SERVER_ENDPOINT env var points at. Parses
-/// AB_SERVER_ENDPOINT (default localhost:44818) + TCP-connects
+/// AB_SERVER_ENDPOINT (default 10.100.0.35:44818 — the shared Docker host) + TCP-connects
/// once at fixture construction. Tests skip via
/// / when the port isn't live, so
/// dotnet test stays green on a fresh clone without Docker running.
@@ -28,7 +28,10 @@ public sealed class AbServerFixture : IAsyncLifetime
/// instantiate the fixture with the profile matching their compose-file service.
public AbServerProfile Profile { get; }
- public string Host { get; } = "127.0.0.1";
+ // 10.100.0.35 = the shared Docker host (see CLAUDE.md "Docker Workflow"). Migrated
+ // off this VM's 127.0.0.1 on 2026-04-28 alongside the rest of the Docker-host move.
+ // Override via AB_SERVER_ENDPOINT to point at a real PLC or a locally-running container.
+ public string Host { get; } = "10.100.0.35";
public int Port { get; } = AbServerProfile.DefaultPort;
public AbServerFixture() : this(KnownProfiles.ControlLogix) { }
@@ -59,7 +62,7 @@ public sealed class AbServerFixture : IAsyncLifetime
TcpProbe(ResolveHost(), ResolvePort());
private static string ResolveHost() =>
- Environment.GetEnvironmentVariable(EndpointEnvVar)?.Split(':', 2)[0] ?? "127.0.0.1";
+ Environment.GetEnvironmentVariable(EndpointEnvVar)?.Split(':', 2)[0] ?? "10.100.0.35";
private static int ResolvePort()
{
@@ -84,7 +87,7 @@ public sealed class AbServerFixture : IAsyncLifetime
///
/// [Fact]-equivalent that skips when ab_server isn't reachable — accepts a
-/// live Docker listener on localhost:44818 or an AB_SERVER_ENDPOINT
+/// live Docker listener on 10.100.0.35:44818 or an AB_SERVER_ENDPOINT
/// override pointing at a real PLC.
///
public sealed class AbServerFactAttribute : FactAttribute
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.IntegrationTests/AbLegacyServerFixture.cs b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.IntegrationTests/AbLegacyServerFixture.cs
index 3e8bd09..20cff56 100644
--- a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.IntegrationTests/AbLegacyServerFixture.cs
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.IntegrationTests/AbLegacyServerFixture.cs
@@ -18,7 +18,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.IntegrationTests;
/// Env-var overrides:
///
/// - AB_LEGACY_ENDPOINT — host:port of the PCCC-mode simulator.
-/// Defaults to localhost:44818 (EtherNet/IP port; ab_server's PCCC
+/// Defaults to 10.100.0.35:44818 — the shared Docker host (EtherNet/IP port; ab_server's PCCC
/// emulation exposes PCCC-over-CIP on the same port as CIP itself).
/// - AB_LEGACY_CIP_PATH — routing path appended to the ab://host:port/
/// URI. Defaults to 1,0 (port-1/slot-0 backplane), required by ab_server
@@ -50,7 +50,10 @@ public sealed class AbLegacyServerFixture : IAsyncLifetime
///
public const string DefaultCipPath = "1,0";
- public string Host { get; } = "127.0.0.1";
+ // 10.100.0.35 = the shared Docker host (see CLAUDE.md "Docker Workflow"). Migrated
+ // off this VM's 127.0.0.1 on 2026-04-28 alongside the rest of the Docker-host move.
+ // Override via AB_LEGACY_ENDPOINT to point at a real PLC or a locally-running container.
+ public string Host { get; } = "10.100.0.35";
public int Port { get; } = DefaultPort;
/// CIP routing path portion of the device URI (after the / separator).
@@ -105,7 +108,7 @@ public sealed class AbLegacyServerFixture : IAsyncLifetime
private static (string Host, int Port) ResolveEndpoint()
{
var raw = Environment.GetEnvironmentVariable(EndpointEnvVar);
- if (raw is null) return ("127.0.0.1", DefaultPort);
+ if (raw is null) return ("10.100.0.35", DefaultPort);
var parts = raw.Split(':', 2);
var port = parts.Length == 2 && int.TryParse(parts[1], out var p) ? p : DefaultPort;
return (parts[0], port);
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.IntegrationTests/ModbusSimulatorFixture.cs b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.IntegrationTests/ModbusSimulatorFixture.cs
index 14f6472..b92c7e6 100644
--- a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.IntegrationTests/ModbusSimulatorFixture.cs
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.IntegrationTests/ModbusSimulatorFixture.cs
@@ -5,7 +5,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus.IntegrationTests;
///
/// Reachability probe for a Modbus TCP simulator (pymodbus in Docker, see
/// Docker/docker-compose.yml) or a real PLC. Parses
-/// MODBUS_SIM_ENDPOINT (default localhost:5020 per PR 43) and TCP-connects once at
+/// MODBUS_SIM_ENDPOINT (default 10.100.0.35:5020 — the shared Docker host) and TCP-connects once at
/// fixture construction. Each test checks and calls
/// Assert.Skip when the endpoint was unreachable, so a dev box without a running
/// simulator still passes `dotnet test` cleanly — matches the Galaxy live-smoke pattern in
@@ -29,8 +29,11 @@ public sealed class ModbusSimulatorFixture : IAsyncDisposable
// PR 43: default port is 5020 (pymodbus convention) instead of 502 (Modbus standard).
// Picking 5020 sidesteps the privileged-port admin requirement on Windows + matches the
// port baked into the pymodbus simulator JSON profiles in Docker/profiles/. Override with
- // MODBUS_SIM_ENDPOINT to point at a real PLC on its native port 502.
- private const string DefaultEndpoint = "localhost:5020";
+ // MODBUS_SIM_ENDPOINT to point at a real PLC on its native port 502, or to a
+ // locally-running container if the shared host is unavailable.
+ // 10.100.0.35 = the shared Docker host (see CLAUDE.md "Docker Workflow"). Migrated
+ // off this VM's localhost on 2026-04-28 alongside the rest of the Docker-host move.
+ private const string DefaultEndpoint = "10.100.0.35:5020";
private const string EndpointEnvVar = "MODBUS_SIM_ENDPOINT";
public string Host { get; }
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.IntegrationTests/OpcPlcFixture.cs b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.IntegrationTests/OpcPlcFixture.cs
index 856a12a..72dd503 100644
--- a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.IntegrationTests/OpcPlcFixture.cs
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.IntegrationTests/OpcPlcFixture.cs
@@ -6,7 +6,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.IntegrationTests;
/// Reachability probe for an opc-plc simulator (Microsoft Industrial IoT's
/// OPC UA PLC from mcr.microsoft.com/iotedge/opc-plc) or any real OPC UA
/// server the OPCUA_SIM_ENDPOINT env var points at. Parses
-/// OPCUA_SIM_ENDPOINT (default opc.tcp://localhost:50000),
+/// OPCUA_SIM_ENDPOINT (default opc.tcp://10.100.0.35:50000 — the shared Docker host),
/// TCP-connects to the resolved host:port at collection init, and records a
/// on failure. Tests call Assert.Skip on that, so
/// `dotnet test` stays green when Docker isn't running the simulator — mirrors the
@@ -32,7 +32,11 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.IntegrationTests;
///
public sealed class OpcPlcFixture : IAsyncDisposable
{
- private const string DefaultEndpoint = "opc.tcp://localhost:50000";
+ // 10.100.0.35 = the shared Docker host (see CLAUDE.md "Docker Workflow"). Migrated
+ // off this VM's localhost on 2026-04-28 alongside the rest of the Docker-host move.
+ // Override via OPCUA_SIM_ENDPOINT to point at a different host or a locally-running
+ // opc-plc instance.
+ private const string DefaultEndpoint = "opc.tcp://10.100.0.35:50000";
private const string EndpointEnvVar = "OPCUA_SIM_ENDPOINT";
/// Full opc.tcp://host:port URL the driver session should connect to.
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests/Snap7ServerFixture.cs b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests/Snap7ServerFixture.cs
index e7dbc22..2b5b306 100644
--- a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests/Snap7ServerFixture.cs
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests/Snap7ServerFixture.cs
@@ -5,7 +5,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests;
///
/// Reachability probe for the python-snap7 simulator Docker container (see
/// Docker/docker-compose.yml) or a real S7 PLC. Parses S7_SIM_ENDPOINT
-/// (default localhost:1102) + TCP-connects once at fixture construction.
+/// (default 10.100.0.35:1102 — the shared Docker host) + TCP-connects once at fixture construction.
/// Tests check + call Assert.Skip when unreachable, so
/// `dotnet test` stays green on a fresh box without the simulator installed —
/// mirrors the ModbusSimulatorFixture pattern.
@@ -35,7 +35,9 @@ public sealed class Snap7ServerFixture : IAsyncDisposable
{
// Default 1102 (non-privileged) matches Docker/server.py. Override with
// S7_SIM_ENDPOINT to point at a real PLC on its native 102.
- private const string DefaultEndpoint = "localhost:1102";
+ // 10.100.0.35 = the shared Docker host (see CLAUDE.md "Docker Workflow"). Migrated
+ // off this VM's localhost on 2026-04-28 alongside the rest of the Docker-host move.
+ private const string DefaultEndpoint = "10.100.0.35:1102";
private const string EndpointEnvVar = "S7_SIM_ENDPOINT";
public string Host { get; }