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enable rp_filter

Hi all,

I used this shell command to enable the rp_filter
functionality on my router:

for f in /proc/sys/net/ipv4/conf/*/rp_filter; do
    echo 1 > $f

There're two devices while one is ppp0 and the
other routes all packets straight into the LAN.

Is this required or recommended to activate rp_filter
on all devices or should only eth1 or ppp0 be 
filtered to avoid spoofing ? 

Best Regards,


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