diff --git a/eth_interface.c b/eth_interface.c
index fef4ed8..a244b6b 100644
--- a/eth_interface.c
+++ b/eth_interface.c
@@ -6,10 +6,22 @@
 #include "dynmem.h"
 #include "utils.h"
 
-EthInterface *ethintf_new() {
+static int ethintf_llrecv(EthIODef * io, const RawPckt * pckt) {
+    ethinf_receive((EthInterface *) io->tag, pckt);
+    return 0;
+}
+
+static void ethintf_register(EthInterface * intf) {
+    intf->ioDef->tag = intf;
+    intf->ioDef->llRxDone = ethintf_llrecv;
+}
+
+EthInterface *ethintf_new(EthIODef * io) {
     EthInterface * ethIntf = (EthInterface *)dynmem_alloc(sizeof(EthInterface));
     ASSERT_NULL(ethIntf);
     memset(&ethIntf->sieve.layer0, 0, sizeof(PcktSieveLayer));
+    ethIntf->ioDef = io;
+    ethintf_register(ethIntf);
     return ethIntf;
 }
 
@@ -18,5 +30,5 @@ void ethinf_receive(EthInterface *intf, const RawPckt *rawPckt) {
 }
 
 void ethinf_transmit(EthInterface *intf, const RawPckt *rawPckt) {
-    intf->ioDef.llTx(rawPckt);
+    intf->ioDef->llTx(&(intf->ioDef), rawPckt);
 }
diff --git a/eth_interface.h b/eth_interface.h
index dedd0f6..a5f1f44 100644
--- a/eth_interface.h
+++ b/eth_interface.h
@@ -4,24 +4,27 @@
 #include "packet_sieve.h"
 #include "prefab/packet_parsers/packet_parsers.h"
 
-typedef struct {
-    int (*llTx)(const RawPckt * rawPckt); ///< Function pointer to low-level transmit function
-    int (*llTxDone)(const RawPckt * rawPckt); ///< Transmission done (interrupt) callback
-    int (*llLinkChg)(int linkState); ///< Link change interrupt
-    int (*llError)(int error); ///< Low-level error interrupt
+typedef struct EthIODef_ {
+    int (*llTx)(struct EthIODef_ * io, const RawPckt * rawPckt); ///< Function pointer to low-level transmit function
+    int (*llTxDone)(struct EthIODef_ * io, const RawPckt * rawPckt); ///< Transmission done (interrupt) callback
+    int (*llLinkChg)(struct EthIODef_ * io, int linkState); ///< Link change interrupt
+    int (*llRxDone)(struct EthIODef_ * io, const RawPckt * rawPckt); ///< Receive done callback
+    int (*llError)(struct EthIODef_ * io, int error); ///< Low-level error interrupt
+    void * tag; ///< Some arbitrary tagging
 } EthIODef;
 
 typedef struct EthInterface_ {
     PcktSieve sieve; ///< Packet sieve
-    EthIODef ioDef; ///< Low-level IO definitions
+    EthIODef * ioDef; ///< Low-level IO definitions
     EthernetAddress mac; ///< Ethernet address
 } EthInterface;
 
 /**
  * Allocate a new Ethernet interface
+ * @param io Low-level IO definitions
  * @return new interface instance
  */
-EthInterface * ethintf_new();
+EthInterface *ethintf_new(EthIODef * io);
 
 /**
  * Receive uncooked packet.
diff --git a/global_state.c b/global_state.c
index e9b062c..d4cdf39 100644
--- a/global_state.c
+++ b/global_state.c
@@ -36,5 +36,5 @@ void ethlib_init() {
     E.pcktReg = packreg_new(); // create new packet registry
     register_packet_parsers(); // register packet parsers
 
-    E.ethIntf = ethintf_new(); // create new Ethernet interface
+    //E.ethIntf = ethintf_new(); // create new Ethernet interface
 }
\ No newline at end of file