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XCCDF
Guide to the Secure Configuration of Ubuntu 18.04
System Settings
Network Configuration and Firewalls
Kernel Parameters Which Affect Networking
Network Related Kernel Runtime Parameters for Hosts and Routers
net.ipv4.conf.all.secure_redirects
net.ipv4.conf.all.secure_redirects
An XCCDF Value
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net.ipv4.conf.all.secure_redirects
Enable to prevent hijacking of routing path by only allowing redirects from gateways known in routing table. Disable to refuse acceptance of secure ICMP redirected packets on all interfaces.