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Provide option to harden response to ARP requests

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raja-grewal 2024-11-13 05:41:25 +00:00 committed by GitHub
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README.md
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@ -105,6 +105,9 @@ Networking:
- Optional - Enable ARP filtering to mitigate some ARP spoofing and ARP - Optional - Enable ARP filtering to mitigate some ARP spoofing and ARP
cache poisoning attacks. cache poisoning attacks.
- Optional - Respond to ARP requests only if the target IP address is
on-link, preventing some IP spoofing attacks.
- Optional - Drop gratuitous ARP packets to prevent ARP cache poisoning - Optional - Drop gratuitous ARP packets to prevent ARP cache poisoning
via man-in-the-middle and denial-of-service attacks. via man-in-the-middle and denial-of-service attacks.

7
usr/lib/sysctl.d/990-security-misc.conf
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@ -452,6 +452,13 @@ net.ipv6.conf.*.accept_redirects=0
## ##
#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.
##
## https://cyber.gouv.fr/sites/default/files/document/linux_configuration-en-v2.pdf
##
#net.ipv4.conf.*.arp_ignore=2
## Drop gratuitous ARP (Address Resolution Protocol) packets. ## Drop gratuitous ARP (Address Resolution Protocol) packets.
## Stops ARP responses sent by a device without being explicitly requested. ## Stops ARP responses sent by a device without being explicitly requested.
## Prevents ARP cache poisoning by rejecting fake ARP entries into a network. ## Prevents ARP cache poisoning by rejecting fake ARP entries into a network.