Update SCTP authentication enable call

Change-Id: Id18194a2f4457d40e1176d249cb71c1380be1b64
Signed-off-by: James Kuszmaul <james.kuszmaul@bluerivertech.com>
diff --git a/aos/network/sctp_test.cc b/aos/network/sctp_test.cc
index 8e332e4..458d2d1 100644
--- a/aos/network/sctp_test.cc
+++ b/aos/network/sctp_test.cc
@@ -28,7 +28,9 @@
 namespace {
 void EnableSctpAuthIfAvailable() {
 #if HAS_SCTP_AUTH
-  CHECK(system("/usr/sbin/sysctl net.sctp.auth_enable=1 || /sbin/sysctl "
+  CHECK(system("/usr/sbin/modprobe sctp || /sbin/modprobe sctp; "
+               "/usr/sbin/sysctl net.sctp.auth_enable=1 || "
+               "/sbin/sysctl "
                "net.sctp.auth_enable=1") == 0)
       << "Couldn't enable sctp authentication.";
 #endif