diff --git a/apps/lwip/README.md b/apps/lwip/README.md
index a6bca2d0..3a09eb34 100644
--- a/apps/lwip/README.md
+++ b/apps/lwip/README.md
@@ -14,7 +14,23 @@ arpping -i eth0 192.168.168.2
 
 You should see many packets going back and forth
 
-If there are none check that you are servicing lwip in your timer interrupt.
+Check that you have set the interface up [correctly](https://www.nongnu.org/lwip/2_1_x/sys_init.html)
+
+and you can add logging to LWIP to help for example
+
+```C
+/* debugging */
+#define LWIP_DEBUG                      1
+#define NETIF_DEBUG                     LWIP_DBG_ON
+#define ICMP_DEBUG                      LWIP_DBG_ON
+#define IP_DEBUG                        LWIP_DBG_ON | LWIP_DBG_TRACE
+#define RAW_DEBUG                       LWIP_DBG_ON
+#define UDP_DEBUG                       LWIP_DBG_ON
+#define TCP_DEBUG                       LWIP_DBG_ON
+#define INET_DEBUG                      LWIP_DBG_ON
+#define ETHARP_DEBUG                    LWIP_DBG_ON
+#define TIMERS_DEBUG                    LWIP_DBG_ON
+```
 
 ### arp ping only returns one packet
 
diff --git a/apps/lwip/components/Server/src/eth_interface.c b/apps/lwip/components/Server/src/eth_interface.c
index 6bbc41c6..0afa9d7e 100644
--- a/apps/lwip/components/Server/src/eth_interface.c
+++ b/apps/lwip/components/Server/src/eth_interface.c
@@ -163,7 +163,6 @@ void netif_link_callback(struct netif *netif) {
         err = udp_bind(udp_conn, IP_ADDR_ANY, 7);
         ZF_LOGF_IF(err != ERR_OK, "Failed to bind port 7");
         udp_recv(udp_conn, udp_recv_callback, NULL);
-        netif_set_up(netif);
     }
 }
 
@@ -183,6 +182,7 @@ static struct netif *init_interface(lwip_iface_t *lwip) {
     netif_set_default(lwip->netif);
     netif_set_status_callback(lwip->netif, netif_link_callback);
     netif_set_link_up(lwip->netif);
+    netif_set_up(netif);
     // err = dhcp_start(lwip->netif);
     // ZF_LOGF_IF(err != ERR_OK, "Failed to start dhcp");
 
diff --git a/apps/lwip/components/Server/src/main.c b/apps/lwip/components/Server/src/main.c
index fe5ddb4f..9a53766c 100644
--- a/apps/lwip/components/Server/src/main.c
+++ b/apps/lwip/components/Server/src/main.c
@@ -28,11 +28,11 @@ void pre_init(void)
 /* Callback that gets called when the timer fires. */
 void timer_complete_callback(void)
 {
-    mut_lock();
+    int err = mut_lock();
     counter_s +=1;
     sys_check_timeouts();
     interface_tick();
-    mut_unlock();
+    err = mut_unlock();
 }