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The following are summary of changes: 1) when network.disable.rpfilter is set to true, then rp_filter will be disadbled(set to 0) on all the public interfaces and also default setting of the system. 2) when network.disable.rpfilter is set to false, then rp_filter will be enabled(set to 1) on all the public interfaces and also default setting of the system. 3) here public public interface means , eth2 ... ethN. default setting means (/proc/sys/net/ipv4/conf/default/rp_filter). 4) Default setting change will have impact on non-public interface. Due to these, rp_filter is always enabled on Non-public interfaces(eth0,eth1 and lo). 5) when a new public interface is created, new interface will take rp_filter value from the default setting.