diff --git a/netcon/NetconEthernetTap.cpp b/netcon/NetconEthernetTap.cpp
index 94fd2e9f9..3147ff594 100644
--- a/netcon/NetconEthernetTap.cpp
+++ b/netcon/NetconEthernetTap.cpp
@@ -307,7 +307,7 @@ void NetconEthernetTap::closeAll()
 		closeConnection(tcp_connections.front());
 }
 
-#define ZT_LWIP_TCP_TIMER_INTERVAL 50
+#define ZT_LWIP_TCP_TIMER_INTERVAL 10
 
 void NetconEthernetTap::threadMain()
 	throw()
@@ -657,7 +657,8 @@ err_t NetconEthernetTap::nc_sent(void* arg, struct tcp_pcb *tpcb, u16_t len)
 	if(len) {
 		//fprintf(stderr, "ACKING len = %d, setting read-notify = true, (sndbuf = %d)\n", len, l->conn->pcb->snd_buf);
 		l->tap->_phy.setNotifyReadable(l->conn->dataSock, true);
-		l->tap->handle_write(l->conn);
+		l->tap->_phy.whack();
+		//l->tap->handle_write(l->conn);
 	}
 	return ERR_OK;
 }