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Set net.ipv4.conf.*.arp_filter=1

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raja-grewal 2024-12-19 10:31:43 +00:00 • committed by GitHub
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usr/lib/sysctl.d/990-security-misc.conf
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@ -460,7 +460,7 @@ net.ipv6.conf.*.accept_redirects=0
##
## https://cyber.gouv.fr/sites/default/files/document/linux_configuration-en-v2.pdf
##
#net.ipv4.conf.*.arp_filter=1
net.ipv4.conf.*.arp_filter=1
## Respond to ARP (Address Resolution Protocol) requests only if the target IP address is on-link.
## Reduces IP spoofing attacks by limiting the scope of allowable ARP responses.