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ipv4: Fix rp_filter description in net/ipv4/Kconfig.

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The reverse path filter (rp_filter) will NOT get enabled
when enabling forwarding.  Read the code and tested in
in practice.

Most distributions do enable it in startup scripts.

Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2009-02-22 00:06:20 -08:00 committed by David S. Miller
parent 0117cfabe3
commit b2cc46a8ee
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/Kconfig
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@ -35,7 +35,7 @@ config IP_ADVANCED_ROUTER
at boot time after the /proc file system has been mounted. 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 automatically rejects incoming packets if the routing table entry
for their source address doesn't match the network interface they're for their source address doesn't match the network interface they're
arriving on. This has security advantages because it prevents the arriving on. This has security advantages because it prevents the
@ -46,9 +46,11 @@ config IP_ADVANCED_ROUTER
rp_filter on use: rp_filter on use:
echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter
or and
echo 1 > /proc/sys/net/ipv4/conf/all/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. If unsure, say N here.
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