ipv4: Clarify in docs that accept_local requires rp_filter.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 99d0e05..47b6c79 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -857,9 +857,14 @@
FALSE (host)
accept_local - BOOLEAN
- Accept packets with local source addresses. In combination with
- suitable routing, this can be used to direct packets between two
- local interfaces over the wire and have them accepted properly.
+ Accept packets with local source addresses. In combination
+ with suitable routing, this can be used to direct packets
+ between two local interfaces over the wire and have them
+ accepted properly.
+
+ rp_filter must be set to a non-zero value in order for
+ accept_local to have an effect.
+
default FALSE
route_localnet - BOOLEAN