diff --git a/src/tun.c b/src/tun.c
index 9a82621..bfaaba4 100644
--- a/src/tun.c
+++ b/src/tun.c
@@ -363,7 +363,7 @@ close_tun(int tun_fd)
 }
 
 int 
-write_tun(int tun_fd, char *data, size_t len) 
+write_tun(int tun_fd, unsigned char *data, size_t len)
 {
 #if defined (FREEBSD) || defined (DARWIN) || defined(NETBSD) || defined(WINDOWS32)
 	data += 4;
@@ -372,8 +372,8 @@ write_tun(int tun_fd, char *data, size_t len)
 #ifdef LINUX
 	data[0] = 0x00;
 	data[1] = 0x00;
-	data[2] = 0x08;
-	data[3] = 0x00;
+	data[2] = 0x86;
+	data[3] = 0xdd;
 #else /* OPENBSD */
 	data[0] = 0x00;
 	data[1] = 0x00;
diff --git a/src/tun.h b/src/tun.h
index 9fbdae7..78f3aa1 100644
--- a/src/tun.h
+++ b/src/tun.h
@@ -19,7 +19,7 @@
 
 int open_tun(const char *);
 void close_tun(int);
-int write_tun(int, char *, size_t);
+int write_tun(int, unsigned char *, size_t);
 ssize_t read_tun(int, char *, size_t);
 int tun_setip(const char *, const char *, int);
 int tun_setmtu(unsigned);
diff --git a/src/user.c b/src/user.c
index feeda3d..a8b4061 100644
--- a/src/user.c
+++ b/src/user.c
@@ -113,6 +113,8 @@ find_user_by_ip(uint32_t ip)
 	int ret;
 	int i;
 
+	return 0;
+
 	ret = -1;
 	for (i = 0; i < usercount; i++) {
 		if (users[i].active && !users[i].disabled &&