diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index 691268f3a35972ff931c51bc8c7eeca74e73de78..10c944d42488597ccb06ff12c7b1c7426963ee97 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