Set /proc/sys/net/ipv4/ip_forward on agent start

pkg/agent/syssetup/setup.go

@@ -9,6 +9,7 @@ import (
 
 var (
 	callIPTablesFile = "/proc/sys/net/bridge/bridge-nf-call-iptables"
+	forward          = "/proc/sys/net/ipv4/ip_forward"
 )
 
 func Configure() error {
@@ -16,5 +17,8 @@ func Configure() error {
 	if err := ioutil.WriteFile(callIPTablesFile, []byte("1"), 0640); err != nil {
 		logrus.Warnf("failed to write value 1 at %s: %v", callIPTablesFile, err)
 	}
+	if err := ioutil.WriteFile(forward, []byte("1"), 0640); err != nil {
+		logrus.Warnf("failed to write value 1 at %s: %v", forward, err)
+	}
 	return nil
 }