Code is taken from frostfs-node#1422
Author: Dmitrii Stepanov (dstepanov-yadro)

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

@@ -0,0 +8,4 @@
+	"golang.org/x/sys/unix"
+)
+
+func newDefaulDialer() net.Dialer {

@@ -0,0 +16,4 @@
+	// with OS defaults for keepalive time and interval, use a net.Dialer that sets
+	// the KeepAlive field to a negative value, and sets the SO_KEEPALIVE socket
+	// option to true from the Control field. For a concrete example of how to do
+	// this, see internal.NetDialerWithTCPKeepalive().

@@ -0,0 +25,4 @@
+}
+
+func (s *DialerSource) build(c Config) error {
+	if c.Enabled {

@@ -0,0 +60,4 @@
+
+// NetContextDialer returns net.DialContext dial function.
+// Returns nil if multinet disabled.
+func (s *DialerSource) NetContextDialer() func(context.Context, string, string) (net.Conn, error) {