Author: Jesper Dangaard Brouer <hawk@xxxxxxx>
Date: Fri Feb 20 15:20:57 2009 +0100
Doc: Fix rp_filter description in net/ipv4/Kconfig.
The reverse path filter (rp_filter) will NOT get enabled
when enabling forwarding. Read the code and tested in
in practice.
Most distributions does enable it in startup scripts.
Signed-off-by: Jesper Dangaard Brouer <hawk@xxxxxxx>
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 691268f..10c944d 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -35,7 +35,7 @@ config IP_ADVANCED_ROUTER
at boot time after the /proc file system has been mounted.
- If you turn on IP forwarding, you will also get the rp_filter, which
+ If you turn on IP forwarding, you should consider the rp_filter, which
automatically rejects incoming packets if the routing table entry
for their source address doesn't match the network interface they're
arriving on. This has security advantages because it prevents the
@@ -46,9 +46,11 @@ config IP_ADVANCED_ROUTER
rp_filter on use:
echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter
- or
+ and
echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
+ Note that some distributions enable it in startup scripts.
+
If unsure, say N here.
choice
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