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Merge pull request #291 from raja-grewal/drop_gratuitous_arp

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Drop gratuitous ARP packets
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Patrick Schleizer 2025-01-10 10:29:30 -05:00 committed by GitHub
commit 1b33e83529
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2 changed files with 3 additions and 3 deletions
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4
README.md
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@ -110,8 +110,8 @@ Networking:
- Respond to ARP requests only if the target IP address is on-link, - Respond to ARP requests only if the target IP address is on-link,
preventing some IP spoofing attacks. preventing some IP spoofing attacks.
- Optional - Drop gratuitous ARP packets to prevent ARP cache poisoning - Drop gratuitous ARP packets to prevent ARP cache poisoning via
via man-in-the-middle and denial-of-service attacks. man-in-the-middle and denial-of-service attacks.
- Ignore ICMP echo requests to prevent clock fingerprinting and Smurf attacks. - Ignore ICMP echo requests to prevent clock fingerprinting and Smurf attacks.

2
usr/lib/sysctl.d/990-security-misc.conf
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@ -482,7 +482,7 @@ net.ipv4.conf.*.arp_ignore=2
## https://patchwork.ozlabs.org/project/netdev/patch/1428652454-1224-3-git-send-email-johannes@sipsolutions.net/ ## https://patchwork.ozlabs.org/project/netdev/patch/1428652454-1224-3-git-send-email-johannes@sipsolutions.net/
## https://www.practicalnetworking.net/series/arp/gratuitous-arp/ ## https://www.practicalnetworking.net/series/arp/gratuitous-arp/
## ##
#net.ipv4.conf.*.drop_gratuitous_arp=1 net.ipv4.conf.*.drop_gratuitous_arp=1
## Ignore ICMP echo requests. ## Ignore ICMP echo requests.
## Prevents clock fingerprinting through ICMP timestamps and Smurf attacks. ## Prevents clock fingerprinting through ICMP timestamps and Smurf attacks.