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-rw-r--r--proto/ospf/ospf.h16
1 files changed, 9 insertions, 7 deletions
diff --git a/proto/ospf/ospf.h b/proto/ospf/ospf.h
index 30922fa..341d9a7 100644
--- a/proto/ospf/ospf.h
+++ b/proto/ospf/ospf.h
@@ -10,13 +10,15 @@
#define _BIRD_OSPF_H_
#define MAXNETS 10
-#define OSPF_MAX_PKT_SIZE 65536
- /*
- * RFC 2328 says, maximum packet size is 65535
- * This could be too much for small systems, so I
- * normally allocate 2*mtu - (I found one cisco
- * sending packets mtu+16)
- */
+#define OSPF_MAX_PKT_SIZE 65535
+/*
+ * RFC 2328 says, maximum packet size is 65535 (IP packet size
+ * limit). Really a bit less for OSPF, because this contains also IP
+ * header. This could be too much for small systems, so I normally
+ * allocate 2*mtu (i found one cisco sending packets mtu+16). OSPF
+ * packets are almost always sent small enough to not be fragmented.
+ */
+
#ifdef LOCAL_DEBUG
#define OSPF_FORCE_DEBUG 1
#else