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Improve logging in case of ICMP blocked

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This commit is contained in:
Quentin McGaw
2025-10-03 14:07:07 +00:00
parent ccc2f306b9
commit b6e873cf25
1 changed files with 10 additions and 9 deletions
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19
internal/vpn/tunnelup.go
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@@ -119,14 +119,16 @@ func updateToMaxMTU(ctx context.Context, vpnInterface string,
const pingTimeout = time.Second
vpnLinkMTU, err = pmtud.PathMTUDiscover(ctx, serverIP, vpnLinkMTU, pingTimeout, logger)
if err != nil {
if errors.Is(err, pmtud.ErrMTUNotFound) {
const conservativeMTU = 1300
vpnLinkMTU = conservativeMTU
logger.Debugf("using a conservative MTU of %d (%s)", conservativeMTU, err)
} else {
return fmt.Errorf("path MTU discovering: %w", err)
}
switch {
case err == nil:
logger.Infof("Setting VPN interface %s MTU to maximum valid MTU %d", vpnInterface, vpnLinkMTU)
case errors.Is(err, pmtud.ErrMTUNotFound):
const conservativeMTU = 1300
vpnLinkMTU = conservativeMTU
logger.Infof("Setting VPN interface %s MTU to a conservative MTU of %d (due to: %s)",
vpnInterface, conservativeMTU, err)
default:
return fmt.Errorf("path MTU discovering: %w", err)
}
err = netlinker.LinkSetMTU(link, vpnLinkMTU)
@@ -134,6 +136,5 @@ func updateToMaxMTU(ctx context.Context, vpnInterface string,
return fmt.Errorf("setting VPN interface %s MTU to %d: %w", vpnInterface, vpnLinkMTU, err)
}
logger.Infof("VPN interface %s MTU set to maximum valid MTU %d", vpnInterface, vpnLinkMTU)
return nil
}