diff --git a/ospfd/ospfd.h b/ospfd/ospfd.h
index ec9d9d6..b0a14ce 100644
--- a/ospfd/ospfd.h
+++ b/ospfd/ospfd.h
@@ -129,6 +129,9 @@
 #define OSPF_LS_REFRESH_SHIFT       (60 * 15)
 #define OSPF_LS_REFRESH_JITTER      60
 
+/* Initial send buffer size for ospfd raw sending socket. */
+#define OSPF_SNDBUFLEN_DEFAULT           1024
+
 /* OSPF master for system wide configuration and variables. */
 struct ospf_master
 {
@@ -266,6 +269,7 @@
   struct thread *t_write;
   struct thread *t_read;
   int fd;
+  int maxsndbuflen;
   struct stream *ibuf;
   struct list *oi_write_q;