Linux Hardening and /proc Filesystem Question

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https://bbs.archlinux.org – Hello,I reading about Linux hardening, but when it comes to kernel parameters configuration I have a small doubt.Some tutorials tell you to change kernel network options this way:echo 1 > /proc/sys/net/ipv4/conf /all/rp_filterothers, this way:echo 1 > /proc/sys/net/ipv4/conf /default/rp_filterand others tell you to to change both ways:echo 1 > /proc/sys/net/ipv4/conf /all/rp_filterecho 1 > /proc/sys/net/ipv4/conf /default/rp_filterWhat is the difference, and what is the correct way to change kernel network options? tessio https://bbs.archlinux.org/profile.php?id=46084 (HowTos)