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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. 2) here public public interface means , eth2 ... ethN. default setting means (/proc/sys/net/ipv4/conf/default/rp_filter). 3) Default setting change will have impact on non-public interface.if there is no specific setting for other interfaces in /etc/sysctl.conf or otherexplict setting , they will follow this default settings. currently non-public interface like eth0 ,eth1 does not have any specific setting in sysctl.conf, due to this there rp_filters will be changed when ever network.disable.rpfilter setting is changed. 4) default setting is required to changes beacuse when a new public interface is created, new interface will take rp_filter value from the default setting.
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