net: doc: add default value for neighbour parameters

Signed-off-by: Shan Wei <davidshan@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index c6d5fee888c4..0462a7105304 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -30,16 +30,24 @@ neigh/default/gc_thresh3 - INTEGER
         Maximum number of neighbor entries allowed.  Increase this
         when using large numbers of interfaces and when communicating
         with large numbers of directly-connected peers.
+        Default: 1024
 
 neigh/default/unres_qlen_bytes - INTEGER
         The maximum number of bytes which may be used by packets
         queued for each unresolved address by other network layers.
         (added in linux 3.3)
+        Seting negative value is meaningless and will retrun error.
+        Default: 65536 Bytes(64KB)
 
 neigh/default/unres_qlen - INTEGER
         The maximum number of packets which may be queued for each
         unresolved address by other network layers.
         (deprecated in linux 3.3) : use unres_qlen_bytes instead.
+        Prior to linux 3.3, the default value is 3 which may cause
+        secluded packet loss. The current default value is calculated
+        according to default value of unres_qlen_bytes and true size of
+        packet.
+        Default: 31
 
 mtu_expires - INTEGER
         Time, in seconds, that cached PMTU information is kept.