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usr/lib/sysctl.d/990-security-misc.conf
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@ -477,6 +477,9 @@ net.ipv4.conf.*.arp_filter=1
## https://github.com/mullvad/mullvadvpn-app/pull/7141
## https://www.x41-dsec.de/static/reports/X41-Mullvad-Audit-Public-Report-2024-12-10.pdf
##
## Can lead to breakages with certain VM configurations that may be resolved by lowering protection to `arp_ignore=1`.
## https://github.com/Kicksecure/security-misc/pull/290
##
net.ipv4.conf.*.arp_ignore=2
## Drop gratuitous ARP (Address Resolution Protocol) packets.