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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.
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.
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