diff --git a/arch/sandbox/include/asm/eth-raw-os.h b/arch/sandbox/include/asm/eth-raw-os.h
index f986d31..760f5fb 100644
--- a/arch/sandbox/include/asm/eth-raw-os.h
+++ b/arch/sandbox/include/asm/eth-raw-os.h
@@ -9,10 +9,14 @@
 #ifndef __ETH_RAW_OS_H
 #define __ETH_RAW_OS_H
 
+#define	IFNAMSIZ	16
+
 /**
  * struct eth_sandbox_raw_priv - raw socket session
  *
  * sd: socket descriptor - the open socket during a session
+ * host_ifname: interface name on the host to use for sending our packets
+ * host_ifindex: interface index number on the host
  * device: struct sockaddr_ll - the host interface packets move to/from
  * local: 1 or 0 to select the local interface ('lo') or not
  * local_bindsd: socket descriptor to prevent the kernel from sending
@@ -22,14 +26,16 @@
  */
 struct eth_sandbox_raw_priv {
 	int sd;
+	char host_ifname[IFNAMSIZ];
+	unsigned int host_ifindex;
 	void *device;
 	int local;
 	int local_bind_sd;
 	unsigned short local_bind_udp_port;
 };
 
-int sandbox_eth_raw_os_start(const char *ifname, unsigned char *ethmac,
-			    struct eth_sandbox_raw_priv *priv);
+int sandbox_eth_raw_os_start(struct eth_sandbox_raw_priv *priv,
+			     unsigned char *ethmac);
 int sandbox_eth_raw_os_send(void *packet, int length,
 			    struct eth_sandbox_raw_priv *priv);
 int sandbox_eth_raw_os_recv(void *packet, int *length,