1 files changed, 10 insertions, 0 deletions
diff --git a/babeld/net.c b/babeld/net.c
index eaed51d2..5e0200b0 100644
--- a/babeld/net.c
+++ b/babeld/net.c
@@ -58,6 +58,7 @@ babel_socket(int port)
     int s, rc;
     int saved_errno;
     int one = 1, zero = 0;
+    const int ds = 0xc0;        /* CS6 - Network Control */
 
     s = socket(PF_INET6, SOCK_DGRAM, 0);
     if(s < 0)
@@ -86,6 +87,15 @@ babel_socket(int port)
     if(rc < 0)
         goto fail;
 
+#ifdef IPV6_TCLASS
+    rc = setsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &ds, sizeof(ds));
+#else
+    rc = -1;
+    errno = ENOSYS;
+#endif
+    if(rc < 0)
+        perror("Couldn't set traffic class");
+
     rc = fcntl(s, F_GETFL, 0);
     if(rc < 0)
         goto fail;