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fix: replace device.DefaultMTU with a constant for Windows tunnel MTU #6217

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Merged
soffokl merged 1 commit into from
Aug 17, 2026
Merged

fix: replace device.DefaultMTU with a constant for Windows tunnel MTU #6217

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7 changes: 4 additions & 3 deletions supervisor/daemon/wireguard/wginterface/interface_windows.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,22 +22,23 @@ import (
"net"

"github.com/rs/zerolog/log"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/ipc"
"golang.zx2c4.com/wireguard/tun"

"github.com/mysteriumnetwork/node/supervisor/daemon/wireguard/wginterface/firewall"
"github.com/mysteriumnetwork/node/utils/cmdutil"
)

const windowsTunnelMTU = 1400

func createTunnel(interfaceName string, dns []string) (tunnel tun.Device, _ string, err error) {
log.Info().Msg("Creating Wintun interface")
wintun, err := tun.CreateTUN(interfaceName, device.DefaultMTU)
wintun, err := tun.CreateTUN(interfaceName, windowsTunnelMTU)
if err != nil {
return nil, interfaceName, fmt.Errorf("could not create Wintun tunnel: %w", err)
}

cmd := fmt.Sprintf(`netsh interface ipv4 set subinterface "%s" mtu=%d store=persistent`, interfaceName, device.DefaultMTU)
cmd := fmt.Sprintf(`netsh interface ipv4 set subinterface "%s" mtu=%d store=persistent`, interfaceName, windowsTunnelMTU)
if _, err := cmdutil.PowerShell(cmd); err != nil {
return nil, interfaceName, fmt.Errorf("could not set MTU for tunnel: %w", err)
}
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