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Merge pull request #289 from raja-grewal/arp_filter

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Enable ARP filtering
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Patrick Schleizer 2025-01-10 10:28:48 -05:00 committed by GitHub
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2 changed files with 3 additions and 4 deletions
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3
README.md
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@ -105,8 +105,7 @@ Networking:
- Deny sending and receiving shared media redirects to reduce the risk of IP
spoofing attacks.
- Optional - Enable ARP filtering to mitigate some ARP spoofing and ARP
cache poisoning attacks.
- Enable ARP filtering to mitigate some ARP spoofing and ARP cache poisoning attacks.
- Optional - Respond to ARP requests only if the target IP address is
on-link, preventing some IP spoofing attacks.

4
usr/lib/sysctl.d/990-security-misc.conf
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@ -454,13 +454,13 @@ net.ipv6.conf.*.accept_redirects=0
net.ipv4.conf.*.shared_media=0
## Enable ARP (Address Resolution Protocol) filtering.
## Prevents the Linux kernel from handling the ARP table globally
## 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
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.