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Provide option to enable ARP filtering

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raja-grewal 2024-11-13 05:40:21 +00:00 • committed by GitHub
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usr/lib/sysctl.d/990-security-misc.conf
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@ -443,6 +443,15 @@ net.ipv4.conf.*.send_redirects=0
net.ipv6.conf.*.accept_redirects=0
#net.ipv4.conf.*.secure_redirects=1
## Enable ARP (Address Resolution Protocol) filtering.
## Prevents the Linux kernel from handling the ARP table globally
## Can mitigate some ARP spoofing and ARP cache poisoning attacks.
## Improper filtering can lead to increased ARP traffic and inadvertently block legitimate ARP requests.
##
## https://cyber.gouv.fr/sites/default/files/document/linux_configuration-en-v2.pdf
##
#net.ipv4.conf.*.arp_filter=1
## Drop gratuitous ARP (Address Resolution Protocol) packets.
## Stops ARP responses sent by a device without being explicitly requested.
## Prevents ARP cache poisoning by rejecting fake ARP entries into a network.