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feat: implement dynamic MTU configuration for WireGuard connections #6215

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Merged
soffokl merged 2 commits into from
Aug 14, 2026
Merged

feat: implement dynamic MTU configuration for WireGuard connections #6215

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6dbb30c
feat: implement dynamic MTU configuration for WireGuard connections
soffokl Aug 14, 2026
800fc7e
Merge branch 'master' into add-dynamic-wireguad-MTU
soffokl Aug 14, 2026
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2 changes: 2 additions & 0 deletions services/wireguard/connection/connection.go
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ import (
"github.com/pkg/errors"
"github.com/rs/zerolog/log"

nodeconfig "github.com/mysteriumnetwork/node/config"
"github.com/mysteriumnetwork/node/core/connection"
"github.com/mysteriumnetwork/node/core/connection/connectionstate"
"github.com/mysteriumnetwork/node/core/ip"
Expand Down Expand Up @@ -173,6 +174,7 @@ func (c *Connection) start(ctx context.Context, start startConn, options connect
var conn wg.ConnectionEndpoint
conn, err = start(wgcfg.DeviceConfig{
IfaceName: "", // Interface name will be generated by connection endpoint.
MTU: nodeconfig.GetInt(nodeconfig.FlagWireguardMTU),
Subnet: config.Consumer.IPAddress,
PrivateKey: c.privateKey,
ListenPort: config.LocalPort,
Expand Down
11 changes: 10 additions & 1 deletion services/wireguard/endpoint/proxyclient/client.go
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Expand Up @@ -65,7 +65,9 @@ func (c *client) ConfigureDevice(cfg wgcfg.DeviceConfig) error {
if err != nil {
return fmt.Errorf("could not parse DNS addr: %w", err)
}
tunnel, tnet, err := netstack.CreateNetTUN([]netip.Addr{localAddr}, []netip.Addr{dnsAddr}, device.DefaultMTU)
mtu := effectiveMTU(cfg.MTU)
log.Info().Int("mtu", mtu).Msg("Creating proxy-mode WireGuard netstack")
tunnel, tnet, err := netstack.CreateNetTUN([]netip.Addr{localAddr}, []netip.Addr{dnsAddr}, mtu)
if err != nil {
return fmt.Errorf("failed to create netstack device %s: %w", cfg.IfaceName, err)
}
Expand Down Expand Up @@ -94,6 +96,13 @@ func (c *client) ConfigureDevice(cfg wgcfg.DeviceConfig) error {
return nil
}

func effectiveMTU(configured int) int {
if configured > 0 {
return configured
}
return device.DefaultMTU
}

func (c *client) DestroyDevice(iface string) error {
return c.Close()
}
Expand Down
6 changes: 6 additions & 0 deletions services/wireguard/endpoint/proxyclient/client_test.go
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Expand Up @@ -23,8 +23,14 @@ import (

"github.com/mysteriumnetwork/node/services/wireguard/wgcfg"
"github.com/stretchr/testify/assert"
"golang.zx2c4.com/wireguard/device"
)

func TestEffectiveMTU(t *testing.T) {
assert.Equal(t, device.DefaultMTU, effectiveMTU(0))
assert.Equal(t, 1280, effectiveMTU(1280))
}

func Test_ConfigureDevice_ConfigureErrors(t *testing.T) {

client, err := New()
Expand Down
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