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Set net.ipv4.conf.*.shared_media=0

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raja-grewal 2024-12-19 10:29:56 +00:00 • committed by GitHub
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4
README.md
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@ -102,8 +102,8 @@ Networking:
- Disable ICMP redirect acceptance and redirect sending messages to prevent - Disable ICMP redirect acceptance and redirect sending messages to prevent
man-in-the-middle attacks and minimize information disclosure. man-in-the-middle attacks and minimize information disclosure.
- Optional - Deny sending and receiving shared media redirects to reduce - Deny sending and receiving shared media redirects to reduce the risk of IP
the risk of IP spoofing attacks. spoofing attacks.
- 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.

2
usr/lib/sysctl.d/990-security-misc.conf
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@ -451,7 +451,7 @@ net.ipv6.conf.*.accept_redirects=0
## https://datatracker.ietf.org/doc/html/rfc1620 ## https://datatracker.ietf.org/doc/html/rfc1620
## https://www.frozentux.net/ipsysctl-tutorial/chunkyhtml/theconfvariables.html ## https://www.frozentux.net/ipsysctl-tutorial/chunkyhtml/theconfvariables.html
## ##
#net.ipv4.conf.*.shared_media=0 net.ipv4.conf.*.shared_media=0
## Enable ARP (Address Resolution Protocol) filtering. ## 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