diff --git a/tun.cpp b/tun.cpp
index 4c95680..3293a70 100644
--- a/tun.cpp
+++ b/tun.cpp
@@ -28,6 +28,7 @@
 #include <syslog.h>
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 
 typedef ip IpHeader;
 
@@ -39,7 +40,7 @@ Tun::Tun(const char *device, int mtu)
 
 	if (device != NULL)
 	{
-		strncmp(this->device, device, VTUN_DEV_LEN);
+		strncpy(this->device, device, VTUN_DEV_LEN);
 		this->device[VTUN_DEV_LEN] = 0;
 	}
 	else
@@ -81,7 +82,8 @@ void Tun::write(const char *buffer, int length)
 	if (tun_write(fd, (char *)buffer, length) == -1)
 	{
 		syslog(LOG_ERR, "error writing %d bytes to tun", length);
-		throw Exception("writing to tun", true);
+		if (errno != EINVAL) // can be caused by invalid data packet
+			throw Exception("writing to tun", true);
 	}
 }
 
@@ -89,7 +91,10 @@ int Tun::read(char *buffer)
 {
 	int length = tun_read(fd, buffer, mtu);
 	if (length == -1)
+	{
+		syslog(LOG_ERR, "error reading from tun", length);
 		throw Exception("reading from tun", true);
+	}
 	return length;
 }