@@ -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
echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
+ Note that some distributions enable it in startup scripts.
If unsure, say N here.