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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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README.md
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@ -105,8 +105,7 @@ Networking:
- Optional - Deny sending and receiving shared media redirects to reduce - Optional - Deny sending and receiving shared media redirects to reduce
the risk of IP spoofing attacks. the risk of IP spoofing attacks.
- Optional - Enable ARP filtering to mitigate some ARP spoofing and ARP - 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 - Optional - Respond to ARP requests only if the target IP address is
on-link, preventing some IP spoofing attacks. on-link, preventing some IP spoofing attacks.

2
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 ## 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. ## 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. ## Reduces IP spoofing attacks by limiting the scope of allowable ARP responses.