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XCCDF
Guide to the Secure Configuration of Ubuntu 16.04
System Settings
Network Configuration and Firewalls
Kernel Parameters Which Affect Networking
Network Related Kernel Runtime Parameters for Hosts and Routers
net.ipv4.conf.all.rp_filter
net.ipv4.conf.all.rp_filter
An XCCDF Value
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net.ipv4.conf.all.rp_filter
Enable to enforce sanity checking, also called ingress filtering or egress filtering. The point is to drop a packet if the source and destination IP addresses in the IP header do not make sense when considered in light of the physical interface on which it arrived.