nat: Open IPv4 forwarding file with proper mode

The file needs to be read and written to.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/nat.c b/src/nat.c
index b739e114..33ae6df0 100644
--- a/src/nat.c
+++ b/src/nat.c
@@ -48,7 +48,7 @@ static int enable_ip_forward(bool enable)
 	static char value = 0;
 	int f, err = 0;
 
-	if ((f = open("/proc/sys/net/ipv4/ip_forward", O_CLOEXEC)) < 0)
+	if ((f = open("/proc/sys/net/ipv4/ip_forward", O_CLOEXEC | O_RDWR)) < 0)
 		return -errno;
 
 	if (!value) {