Use 255 as the outgoing hop count.

net.c

@@ -36,7 +36,7 @@ babel_socket(int port)
     struct sockaddr_in6 sin6;
     int s, rc;
     int saved_errno;
-    int one = 1, zero = 0;
+    int one = 1, zero = 0, twofiftyfive = 255;
 
     s = socket(PF_INET6, SOCK_DGRAM, 0);
     if(s < 0)
@@ -58,6 +58,16 @@ babel_socket(int port)
     if(rc < 0)
         goto fail;
 
+    rc = setsockopt(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
+                    &twofiftyfive, sizeof(twofiftyfive));
+    if(rc < 0)
+        goto fail;
+
+    rc = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
+                    &twofiftyfive, sizeof(twofiftyfive));
+    if(rc < 0)
+        goto fail;
+
     rc = fcntl(s, F_GETFL, 0);
     if(rc < 0)
         goto fail;