network: add auto-detection of optimal MTU for WireGuard interface, --wg-mtu flag, set max_mtu for Corrosion to 1232

cmd/uncloud/machine/add.go

@@ -30,6 +30,7 @@ type addOptions struct {
 	version     string
 	wgEndpoints []string
 	wgPort      int
+	wgMTU       int
 	yes         bool
 }
 
@@ -104,6 +105,10 @@ Connection methods:
 			"Multiple endpoints can be specified by repeating the flag or using a comma-separated list.\n"+
 			"Defaults to the auto-detected public and routable machine IPs.",
 	)
+	cmd.Flags().IntVar(
+		&opts.wgMTU, "wg-mtu", 0,
+		"MTU of the WireGuard network interface on the machine. (default auto-detects the optimal value)",
+	)
 	cmd.Flags().IntVar(
 		&opts.wgPort, "wg-port", network.DefaultWireGuardPort,
 		"UDP port WireGuard listens on for incoming connections from other machines.",
@@ -133,12 +138,17 @@ func add(ctx context.Context, uncli *cli.CLI, remoteMachine *cli.RemoteMachine,
 	if opts.wgPort < 1 || opts.wgPort > 65535 {
 		return fmt.Errorf("invalid WireGuard port %d: must be between 1 and 65535", opts.wgPort)
 	}
+	if opts.wgMTU != 0 && (opts.wgMTU < network.MinWireGuardMTU || opts.wgMTU > 65535) {
+		return fmt.Errorf("invalid WireGuard MTU %d: must be 0 (auto-detect) or between %d and 65535",
+			opts.wgMTU, network.MinWireGuardMTU)
+	}
 	addOpts := cli.AddMachineOptions{
 		MachineName:   opts.name,
 		PublicIP:      publicIP,
 		RemoteMachine: remoteMachine,
 		SkipInstall:   opts.noInstall,
 		Version:       opts.version,
+		WireguardMTU:  opts.wgMTU,
 		WireguardPort: opts.wgPort,
 		AutoConfirm:   opts.yes,
 	}

cmd/uncloud/machine/init.go

@@ -34,6 +34,7 @@ type initOptions struct {
 	version     string
 	wgEndpoints []string
 	wgPort      int
+	wgMTU       int
 	yes         bool
 }
 
@@ -143,6 +144,10 @@ Connection methods:
 			"Multiple endpoints can be specified by repeating the flag or using a comma-separated list.\n"+
 			"Defaults to the auto-detected public and routable machine IPs.",
 	)
+	cmd.Flags().IntVar(
+		&opts.wgMTU, "wg-mtu", 0,
+		"MTU of the WireGuard network interface on the machine. (default auto-detects the optimal value)",
+	)
 	cmd.Flags().IntVar(
 		&opts.wgPort, "wg-port", network.DefaultWireGuardPort,
 		"UDP port WireGuard listens on for incoming connections from other machines.",
@@ -186,6 +191,10 @@ func initCluster(ctx context.Context, uncli *cli.CLI, remoteMachine *cli.RemoteM
 	if opts.wgPort < 1 || opts.wgPort > 65535 {
 		return fmt.Errorf("invalid WireGuard port %d: must be between 1 and 65535", opts.wgPort)
 	}
+	if opts.wgMTU != 0 && (opts.wgMTU < network.MinWireGuardMTU || opts.wgMTU > 65535) {
+		return fmt.Errorf("invalid WireGuard MTU %d: must be 0 (auto-detect) or between %d and 65535",
+			opts.wgMTU, network.MinWireGuardMTU)
+	}
 	initOpts := cli.InitClusterOptions{
 		Context:       opts.context,
 		MachineName:   opts.name,
@@ -194,6 +203,7 @@ func initCluster(ctx context.Context, uncli *cli.CLI, remoteMachine *cli.RemoteM
 		RemoteMachine: remoteMachine,
 		SkipInstall:   opts.noInstall,
 		Version:       opts.version,
+		WireguardMTU:  opts.wgMTU,
 		WireguardPort: opts.wgPort,
 		AutoConfirm:   opts.yes,
 	}

internal/cli/cli.go

@@ -175,6 +175,7 @@ type InitClusterOptions struct {
 	Version            string
 	AutoConfirm        bool
 	WireguardEndpoints []*pb.IPPort
+	WireguardMTU       int
 	WireguardPort      int
 }
 
@@ -236,6 +237,7 @@ func (cli *CLI) initRemoteMachine(ctx context.Context, opts InitClusterOptions)
 		MachineName:        opts.MachineName,
 		Network:            pb.NewIPPrefix(opts.Network),
 		WireguardEndpoints: opts.WireguardEndpoints,
+		WireguardMtu:       int32(opts.WireguardMTU),
 		WireguardPort:      int32(opts.WireguardPort),
 	}
 	if opts.PublicIP != nil {
@@ -320,6 +322,7 @@ type AddMachineOptions struct {
 	Version            string
 	AutoConfirm        bool
 	WireguardEndpoints []*pb.IPPort
+	WireguardMTU       int
 	WireguardPort      int
 }
 
@@ -463,6 +466,7 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
 		Machine:         addResp.Machine,
 		OtherMachines:   otherMachines,
 		MinStoreVersion: storeVersion,
+		WireguardMtu:    int32(opts.WireguardMTU),
 		WireguardPort:   int32(opts.WireguardPort),
 	}
 	if _, err = machineClient.JoinCluster(ctx, joinReq); err != nil {

internal/machine/api/pb/machine.pb.go

@@ -238,6 +238,8 @@ type InitClusterRequest struct {
 	WireguardEndpoints []*IPPort `protobuf:"bytes,5,rep,name=wireguard_endpoints,json=wireguardEndpoints,proto3" json:"wireguard_endpoints,omitempty"`
 	// WireGuard listen port for this machine. Uses the default port (51820) if 0 or not set.
 	WireguardPort int32 `protobuf:"varint,6,opt,name=wireguard_port,json=wireguardPort,proto3" json:"wireguard_port,omitempty"`
+	// MTU of the WireGuard interface on this machine. The daemon auto-detects the optimal MTU if 0 or not set.
+	WireguardMtu int32 `protobuf:"varint,7,opt,name=wireguard_mtu,json=wireguardMtu,proto3" json:"wireguard_mtu,omitempty"`
 }
 
 func (x *InitClusterRequest) Reset() {
@@ -321,6 +323,13 @@ func (x *InitClusterRequest) GetWireguardPort() int32 {
 	return 0
 }
 
+func (x *InitClusterRequest) GetWireguardMtu() int32 {
+	if x != nil {
+		return x.WireguardMtu
+	}
+	return 0
+}
+
 type isInitClusterRequest_PublicIpConfig interface {
 	isInitClusterRequest_PublicIpConfig()
 }
@@ -393,6 +402,8 @@ type JoinClusterRequest struct {
 	OtherMachines []*MachineInfo `protobuf:"bytes,3,rep,name=other_machines,json=otherMachines,proto3" json:"other_machines,omitempty"`
 	// WireGuard listen port for this machine. Uses the default port (51820) if 0 or not set.
 	WireguardPort int32 `protobuf:"varint,5,opt,name=wireguard_port,json=wireguardPort,proto3" json:"wireguard_port,omitempty"`
+	// MTU of the WireGuard interface on this machine. The daemon auto-detects the optimal MTU if 0 or not set.
+	WireguardMtu int32 `protobuf:"varint,7,opt,name=wireguard_mtu,json=wireguardMtu,proto3" json:"wireguard_mtu,omitempty"`
 	// Cluster store version this machine must reach before participating.
 	// Per-actor vector (Corrosion actor UUID → max applied db_version).
 	MinStoreVersion map[string]int64 `protobuf:"bytes,6,rep,name=min_store_version,json=minStoreVersion,proto3" json:"min_store_version,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
@@ -451,6 +462,13 @@ func (x *JoinClusterRequest) GetWireguardPort() int32 {
 	return 0
 }
 
+func (x *JoinClusterRequest) GetWireguardMtu() int32 {
+	if x != nil {
+		return x.WireguardMtu
+	}
+	return 0
+}
+
 func (x *JoinClusterRequest) GetMinStoreVersion() map[string]int64 {
 	if x != nil {
 		return x.MinStoreVersion
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-	0x2e, 0x49, 0x6e, 0x73, 0x70, 0x65, 0x63, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x52,
-	0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1b, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x49, 0x6e, 0x73,
-	0x70, 0x65, 0x63, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f,
-	0x6e, 0x73, 0x65, 0x12, 0x30, 0x0a, 0x0b, 0x4d, 0x61, 0x63, 0x68, 0x69, 0x6e, 0x65, 0x4c, 0x6f,
-	0x67, 0x73, 0x12, 0x10, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x4c, 0x6f, 0x67, 0x73, 0x52, 0x65, 0x71,
-	0x75, 0x65, 0x73, 0x74, 0x1a, 0x0d, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x4c, 0x6f, 0x67, 0x45, 0x6e,
-	0x74, 0x72, 0x79, 0x30, 0x01, 0x42, 0x37, 0x5a, 0x35, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e,
-	0x63, 0x6f, 0x6d, 0x2f, 0x70, 0x73, 0x76, 0x69, 0x64, 0x65, 0x72, 0x73, 0x6b, 0x69, 0x2f, 0x75,
-	0x6e, 0x63, 0x6c, 0x6f, 0x75, 0x64, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f,
-	0x6d, 0x61, 0x63, 0x68, 0x69, 0x6e, 0x65, 0x2f, 0x61, 0x70, 0x69, 0x2f, 0x70, 0x62, 0x62, 0x06,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x32,
+	0x0a, 0x05, 0x52, 0x65, 0x73, 0x65, 0x74, 0x12, 0x11, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x52, 0x65,
+	0x73, 0x65, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f,
+	0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70,
+	0x74, 0x79, 0x12, 0x49, 0x0a, 0x0e, 0x49, 0x6e, 0x73, 0x70, 0x65, 0x63, 0x74, 0x53, 0x65, 0x72,
+	0x76, 0x69, 0x63, 0x65, 0x12, 0x1a, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x49, 0x6e, 0x73, 0x70, 0x65,
+	0x63, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74,
+	0x1a, 0x1b, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x49, 0x6e, 0x73, 0x70, 0x65, 0x63, 0x74, 0x53, 0x65,
+	0x72, 0x76, 0x69, 0x63, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x30, 0x0a,
+	0x0b, 0x4d, 0x61, 0x63, 0x68, 0x69, 0x6e, 0x65, 0x4c, 0x6f, 0x67, 0x73, 0x12, 0x10, 0x2e, 0x61,
+	0x70, 0x69, 0x2e, 0x4c, 0x6f, 0x67, 0x73, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x0d,
+	0x2e, 0x61, 0x70, 0x69, 0x2e, 0x4c, 0x6f, 0x67, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x30, 0x01, 0x42,
+	0x37, 0x5a, 0x35, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x70, 0x73,
+	0x76, 0x69, 0x64, 0x65, 0x72, 0x73, 0x6b, 0x69, 0x2f, 0x75, 0x6e, 0x63, 0x6c, 0x6f, 0x75, 0x64,
+	0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x6d, 0x61, 0x63, 0x68, 0x69, 0x6e,
+	0x65, 0x2f, 0x61, 0x70, 0x69, 0x2f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

internal/machine/api/pb/machine.proto

@@ -61,9 +61,10 @@ message InitClusterRequest {
 
   // Optional WireGuard endpoints other machines will use to connect to this machine instead of auto-discovered ones.
   repeated IPPort wireguard_endpoints = 5;
-
   // WireGuard listen port for this machine. Uses the default port (51820) if 0 or not set.
   int32 wireguard_port = 6;
+  // MTU of the WireGuard interface on this machine. The daemon auto-detects the optimal MTU if 0 or not set.
+  int32 wireguard_mtu = 7;
 }
 
 message InitClusterResponse {
@@ -75,6 +76,8 @@ message JoinClusterRequest {
   repeated MachineInfo other_machines = 3;
   // WireGuard listen port for this machine. Uses the default port (51820) if 0 or not set.
   int32 wireguard_port = 5;
+  // MTU of the WireGuard interface on this machine. The daemon auto-detects the optimal MTU if 0 or not set.
+  int32 wireguard_mtu = 7;
   // Cluster store version this machine must reach before participating.
   // Per-actor vector (Corrosion actor UUID → max applied db_version).
   map<string, int64> min_store_version = 6;

internal/machine/cluster.go

@@ -326,6 +326,7 @@ func (cc *clusterController) ensureDockerNetwork(ctx context.Context) error {
 	if err := cc.dockerCtrl.EnsureUncloudNetwork(
 		ctx,
 		cc.state.Network.Subnet,
+		cc.state.Network.EffectiveMTU(),
 		cc.dnsServer.ListenAddr(),
 	); err != nil {
 		return fmt.Errorf("ensure Docker network: %w", err)

internal/machine/corroservice/config.go

@@ -32,6 +32,9 @@ type DBConfig struct {
 
 type GossipConfig struct {
 	Addr netip.AddrPort `toml:"addr"`
+	// MaxMTU is the upper bound for QUIC's MTU, preventing automatic MTU discovery. It is the effective MTU:
+	// the gossip network interface's MTU minus the IP and UDP header sizes. Must be >= 1200. Omitted when zero.
+	MaxMTU    uint32   `toml:"max_mtu,omitempty"`
 	Bootstrap []string `toml:"bootstrap"`
 	Plaintext bool     `toml:"plaintext"`
 }

internal/machine/docker/controller_darwin.go

@@ -9,7 +9,9 @@ import (
 )
 
 // EnsureUncloudNetwork is a stub for Darwin.
-func (c *Controller) EnsureUncloudNetwork(ctx context.Context, subnet netip.Prefix, dnsServer netip.Addr) error {
+func (c *Controller) EnsureUncloudNetwork(
+	ctx context.Context, subnet netip.Prefix, mtu int, dnsServer netip.Addr,
+) error {
 	return fmt.Errorf("not supported on Darwin")
 }
 

internal/machine/docker/controller_linux.go

@@ -19,12 +19,21 @@ import (
 	"github.com/psviderski/uncloud/pkg/api"
 )
 
-// EnsureUncloudNetwork creates the Docker bridge network NetworkName with the provided machine subnet
-// if it doesn't exist. If the network exists but has a different subnet, it removes and recreates the network.
+// driverMTUOption is the Docker bridge network option that sets the MTU on the bridge and on each container's
+// interface attached to the network. It is immutable, so changing it requires recreating the network.
+const driverMTUOption = "com.docker.network.driver.mtu"
+
+// EnsureUncloudNetwork creates the Docker bridge network NetworkName with the provided machine subnet and MTU
+// if it doesn't exist. The subnet and MTU are immutable Docker network options, so if the existing network has
+// a different subnet it is removed and recreated. If it has a different MTU, it is recreated only when no
+// containers are attached (otherwise the change is deferred with a warning to avoid disrupting running services).
 // It also configures iptables to allow container access from the WireGuard network.
-func (c *Controller) EnsureUncloudNetwork(ctx context.Context, subnet netip.Prefix, dnsServer netip.Addr) error {
-	// Ensure the Docker network 'uncloud' is created with the correct subnet.
+func (c *Controller) EnsureUncloudNetwork(
+	ctx context.Context, subnet netip.Prefix, mtu int, dnsServer netip.Addr,
+) error {
+	// Ensure the Docker network 'uncloud' is created with the correct subnet and MTU.
 	needsCreation := false
+	mtuStr := strconv.Itoa(mtu)
 	nw, err := c.client.NetworkInspect(ctx, NetworkName, dnetwork.InspectOptions{})
 	if err != nil {
 		if !errdefs.IsNotFound(err) {
@@ -42,6 +51,24 @@ func (c *Controller) EnsureUncloudNetwork(ctx context.Context, subnet netip.Pref
 			return fmt.Errorf("remove Docker network '%s': %w", NetworkName, err)
 		}
 		needsCreation = true
+	} else if nw.Options[driverMTUOption] != mtuStr {
+		// The MTU changed. Recreating the network is the only way to apply it, which is only possible when no
+		// containers are attached. Don't disrupt running services. Defer the change with a warning otherwise.
+		if len(nw.Containers) == 0 {
+			slog.Info("Recreating Docker network to apply new MTU.", "name", NetworkName, "mtu", mtu)
+			if err = c.client.NetworkRemove(ctx, NetworkName); err != nil {
+				return fmt.Errorf("remove Docker network '%s': %w", NetworkName, err)
+			}
+			needsCreation = true
+		} else {
+			slog.Warn("New WireGuard MTU can't be applied to the Docker network because it must be recreated but "+
+				"it's in use by the running service containers. You can either remove all service containers on the "+
+				"machine and restart the daemon (uncloud.service). Or disconnect them from the network "+
+				"(docker network disconnect), restart the daemon, and reconnect them back (docker network connect) "+
+				"without removing them.",
+				"name", NetworkName, "current_mtu", nw.Options[driverMTUOption], "desired_mtu", mtu,
+				"containers", len(nw.Containers))
+		}
 	}
 
 	if needsCreation {
@@ -63,12 +90,15 @@ func (c *Controller) EnsureUncloudNetwork(ctx context.Context, subnet netip.Pref
 					// Starting with Docker 28.2.0 (https://github.com/moby/moby/pull/49832), we have to explicitly
 					// allow direct routing from the WireGuard interface to the bridge network.
 					"com.docker.network.bridge.trusted_host_interfaces": network.WireGuardInterfaceName,
+					// Match the container interfaces' MTU to the WireGuard interface so cross-machine container
+					// traffic is right-sized for the tunnel.
+					driverMTUOption: mtuStr,
 				},
 			},
 		); err != nil {
 			return fmt.Errorf("create Docker network '%s': %w", NetworkName, err)
 		}
-		slog.Info("Docker network created.", "name", NetworkName, "subnet", subnet.String())
+		slog.Info("Docker network created.", "name", NetworkName, "subnet", subnet.String(), "mtu", mtu)
 
 		if nw, err = c.client.NetworkInspect(ctx, NetworkName, dnetwork.InspectOptions{}); err != nil {
 			return fmt.Errorf("inspect Docker network '%s': %w", NetworkName, err)

internal/machine/machine.go

@@ -657,6 +657,12 @@ func (m *Machine) configureCorrosion() error {
 		Gossip: corroservice.GossipConfig{
 			Addr:      gossipAddr,
 			Bootstrap: bootstrap,
+			// Cap QUIC's MTU conservatively based on the minimum possible WireGuard MTU (1280) rather than this
+			// machine's actual (possibly larger) MTU. Gossip is small control-plane traffic where stability matters
+			// far more than throughput: a fixed small MTU keeps datagrams well within any machine's WireGuard link
+			// and avoids black-holing across heterogeneous underlays where the local MTU can't see the path MTU
+			// to a peer. The gossip (management) address is IPv6, so subtract the IPv6 (40) and UDP (8) headers.
+			MaxMTU:    uint32(network.MinWireGuardMTU - 48),
 			Plaintext: true,
 		},
 		API: corroservice.APIConfig{
@@ -772,6 +778,11 @@ func (m *Machine) InitCluster(ctx context.Context, req *pb.InitClusterRequest) (
 		wgPort = network.DefaultWireGuardPort
 	}
 
+	wgMTU := int(req.WireguardMtu)
+	if wgMTU == 0 {
+		wgMTU = network.DetectMTU()
+	}
+
 	// Use explicitly provided WireGuard endpoints, or use the routable IPs on the machine and its public IP
 	// if not provided. The IPs are auto-detected.
 	var endpoints []*pb.IPPort
@@ -831,6 +842,7 @@ func (m *Machine) InitCluster(ctx context.Context, req *pb.InitClusterRequest) (
 		Subnet:        subnet,
 		ManagementIP:  manageIP,
 		WireGuardPort: int(wgPort),
+		MTU:           wgMTU,
 		PrivateKey:    m.state.Network.PrivateKey,
 		PublicKey:     m.state.Network.PublicKey,
 	}
@@ -881,12 +893,18 @@ func (m *Machine) JoinCluster(_ context.Context, req *pb.JoinClusterRequest) (*e
 		wgPort = network.DefaultWireGuardPort
 	}
 
+	wgMTU := int(req.WireguardMtu)
+	if wgMTU == 0 {
+		wgMTU = network.DetectMTU()
+	}
+
 	m.state.ID = req.Machine.Id
 	m.state.Name = req.Machine.Name
 	m.state.Network = &network.Config{
 		Subnet:        subnet,
 		ManagementIP:  manageIP,
 		WireGuardPort: wgPort,
+		MTU:           wgMTU,
 		PrivateKey:    m.state.Network.PrivateKey,
 		PublicKey:     m.state.Network.PublicKey,
 	}

internal/machine/network/config.go

@@ -18,6 +18,8 @@ type Config struct {
 	ManagementIP netip.Addr
 	// WireGuardPort is the UDP port WireGuard listens on. Zero means the default port (51820).
 	WireGuardPort int `json:",omitempty"`
+	// MTU of the WireGuard interface. Use EffectiveMTU to get the default if not set (zero).
+	MTU        int `json:",omitempty"`
 	PrivateKey secret.Secret
 	PublicKey  secret.Secret
 	Peers      []PeerConfig `json:",omitempty"`
@@ -48,6 +50,14 @@ func (c Config) EffectiveWireGuardPort() int {
 	return DefaultWireGuardPort
 }
 
+// EffectiveMTU returns the MTU for the WireGuard interface. Falls back to MaxWireGuardMTU if not set (zero).
+func (c Config) EffectiveMTU() int {
+	if c.MTU != 0 {
+		return c.MTU
+	}
+	return MaxWireGuardMTU
+}
+
 // toDeviceConfig converts the configuration to a WireGuard device configuration. It updates the existing peers
 // without replacing them to not disrupt existing connections and to not lose track of the last handshake time.
 func (c Config) toDeviceConfig(currentPeers []wgtypes.Peer) (wgtypes.Config, error) {

internal/machine/network/mtu.go

@@ -0,0 +1,22 @@
+package network
+
+import "log/slog"
+
+// DetectMTU returns the optimal MTU for the WireGuard interface based on the machine's egress network.
+// The egress MTU is capped at MaxWireGuardMTU to not overestimate the path MTU between machines which can go over
+// the public internet. If the egress MTU cannot be detected, it falls back to MaxWireGuardMTU.
+func DetectMTU() int {
+	egressMTU, err := detectEgressMTU()
+	if err != nil {
+		slog.Warn("Failed to detect egress network MTU, falling back to the default WireGuard MTU.",
+			"mtu", MaxWireGuardMTU, "err", err)
+		return MaxWireGuardMTU
+	}
+
+	mtu := egressMTU - wireGuardEncapOverhead
+	// Clamp the computed MTU to the range [MinWireGuardMTU, MaxWireGuardMTU].
+	mtu = min(max(mtu, MinWireGuardMTU), MaxWireGuardMTU)
+	slog.Info("Detected optimal WireGuard MTU from the egress network.", "mtu", mtu, "egress_mtu", egressMTU)
+
+	return mtu
+}

internal/machine/network/mtu_darwin.go

@@ -0,0 +1,10 @@
+//go:build darwin
+
+package network
+
+import "errors"
+
+// detectEgressMTU is a stub for Darwin. The machine daemon that performs detection only runs on Linux.
+func detectEgressMTU() (int, error) {
+	return 0, errors.New("not implemented on darwin")
+}

internal/machine/network/mtu_linux.go

@@ -0,0 +1,39 @@
+//go:build linux
+
+package network
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/vishvananda/netlink"
+)
+
+// detectEgressMTU returns the MTU of the egress network interface.
+// It resolves the route to a public address to find the egress interface.
+func detectEgressMTU() (int, error) {
+	// Resolve the route to a public address to determine the egress interface.
+	routes, err := netlink.RouteGet(net.IPv4(1, 1, 1, 1))
+	if err != nil {
+		return 0, fmt.Errorf("get route to public address: %w", err)
+	}
+	if len(routes) == 0 {
+		return 0, fmt.Errorf("no route to public address")
+	}
+	route := routes[0]
+
+	link, err := netlink.LinkByIndex(route.LinkIndex)
+	if err != nil {
+		return 0, fmt.Errorf("get egress interface for route: %w", err)
+	}
+	// Don't detect the MTU from the WireGuard interface itself if the default route happens to go through it.
+	if link.Attrs().Name == WireGuardInterfaceName {
+		return 0, fmt.Errorf("egress interface is the WireGuard interface '%s'", WireGuardInterfaceName)
+	}
+
+	// Prefer the route-level MTU (e.g. set by PMTU discovery) over the interface MTU if present.
+	if route.MTU > 0 {
+		return route.MTU, nil
+	}
+	return link.Attrs().MTU, nil
+}

internal/machine/network/wireguard.go

@@ -12,6 +12,16 @@ import (
 const (
 	WireGuardInterfaceName = "uncloud"
 	DefaultWireGuardPort   = 51820
+	// MinWireGuardMTU is the minimum MTU for the WireGuard interface. The management traffic inside the tunnel uses
+	// IPv6 whose minimum link MTU is 1280, so this is a safe floor that also keeps Corrosion's max_mtu (>= 1200) valid.
+	MinWireGuardMTU = 1280
+	// MaxWireGuardMTU is the conservative maximum MTU set by auto-detection and the fallback when detection fails.
+	// It's the standard WireGuard MTU for a 1500-byte underlay (1500 - 80) that matches the kernel's default
+	// for WireGuard links.
+	MaxWireGuardMTU = 1500 - wireGuardEncapOverhead
+	// wireGuardEncapOverhead is WireGuard's worst-case (IPv6 endpoint) encapsulation overhead: outer IPv6 (40) +
+	// UDP (8) + WireGuard message header and auth tag (32).
+	wireGuardEncapOverhead = 80
 	// WireGuardKeepaliveInterval is sensible interval that works with a wide variety of firewalls.
 	WireGuardKeepaliveInterval = 25 * time.Second
 )

internal/machine/network/wireguard_linux.go

@@ -53,7 +53,6 @@ func createOrGetLink(name string) (netlink.Link, error) {
 		return nil, fmt.Errorf("find WireGuard link %q: %v", name, err)
 	}
 	link = &netlink.GenericLink{
-		// TODO: figure out how to set the most appropriate MTU.
 		LinkAttrs: netlink.LinkAttrs{Name: name},
 		LinkType:  "wireguard",
 	}
@@ -91,6 +90,14 @@ func (n *WireGuardNetwork) Configure(config Config) error {
 	}
 	slog.Info("Updated addresses of the WireGuard interface.", "name", n.link.Attrs().Name, "addrs", addrs)
 
+	// Set the MTU on the WireGuard interface if it differs from the configured value.
+	if mtu := config.EffectiveMTU(); n.link.Attrs().MTU != mtu {
+		if err = netlink.LinkSetMTU(n.link, mtu); err != nil {
+			return fmt.Errorf("set MTU %d on WireGuard link %q: %w", mtu, n.link.Attrs().Name, err)
+		}
+		slog.Info("Set MTU on the WireGuard interface.", "name", n.link.Attrs().Name, "mtu", mtu)
+	}
+
 	// Bring the WireGuard interface up if it's not already up.
 	if n.link.Attrs().Flags&unix.IFF_UP != unix.IFF_UP {
 		if err = netlink.LinkSetUp(n.link); err != nil {

website/docs/9-cli-reference/uc_machine_add.md

@@ -29,6 +29,7 @@ uc machine add [USER@]HOST[:PORT] [flags]
                               Format: IP, IP:PORT, IPv6, or [IPv6]:PORT. Default port is the value of --wg-port if omitted.
                               Multiple endpoints can be specified by repeating the flag or using a comma-separated list.
                               Defaults to the auto-detected public and routable machine IPs.
+      --wg-mtu int            MTU of the WireGuard network interface on the machine. (default auto-detects the optimal value)
       --wg-port int           UDP port WireGuard listens on for incoming connections from other machines. (default 51820)
   -y, --yes                   Auto-confirm prompts (e.g., resetting an already initialised machine).
                               Should be explicitly set when running non-interactively, e.g., in CI/CD pipelines. [$UNCLOUD_AUTO_CONFIRM]

website/docs/9-cli-reference/uc_machine_init.md

@@ -51,6 +51,7 @@ uc machine init [schema://]USER@HOST[:PORT] [flags]
                               Format: IP, IP:PORT, IPv6, or [IPv6]:PORT. Default port is the value of --wg-port if omitted.
                               Multiple endpoints can be specified by repeating the flag or using a comma-separated list.
                               Defaults to the auto-detected public and routable machine IPs.
+      --wg-mtu int            MTU of the WireGuard network interface on the machine. (default auto-detects the optimal value)
       --wg-port int           UDP port WireGuard listens on for incoming connections from other machines. (default 51820)
   -y, --yes                   Auto-confirm prompts (e.g., resetting an already initialised machine).
                               Should be explicitly set when running non-interactively, e.g., in CI/CD pipelines. [$UNCLOUD_AUTO_CONFIRM]