Documentation: ip-sysctl.txt: clarify secure_redirects

Clarify how secure_redirects works. Mention that RFC1122 always applies.

Signed-off-by: Eric Garver <e@erig.me>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 6c7f365..9ae9293 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1036,15 +1036,17 @@ proxy_arp_pvlan - BOOLEAN
 
 shared_media - BOOLEAN
        Send(router) or accept(host) RFC1620 shared media redirects.
-       Overrides ip_secure_redirects.
+       Overrides secure_redirects.
        shared_media for the interface will be enabled if at least one of
        conf/{all,interface}/shared_media is set to TRUE,
        it will be disabled otherwise
        default TRUE
 
 secure_redirects - BOOLEAN
-       Accept ICMP redirect messages only for gateways,
-       listed in default gateway list.
+       Accept ICMP redirect messages only to gateways listed in the
+       interface's current gateway list. Even if disabled, RFC1122 redirect
+       rules still apply.
+       Overridden by shared_media.
        secure_redirects for the interface will be enabled if at least one of
        conf/{all,interface}/secure_redirects is set to TRUE,
        it will be disabled otherwise