Linux distributions
TMA-ROCKY9-3.3.2.2
Ensure net.ipv6.conf.default.forwarding is configured
설명
The net.ipv6.conf.default.forwarding flag tells the system whether it can forward IPv6 on the default or newly added network interface. More information about the kernel parameter configuration files, their location, and load preference is available in the "Configure Network Kernel Parameters" section overview. Note: If IPv6 has been disabled, or this system is a router, this recommendation is not applicable.
점검 방법
감사 방식: 셸 명령
chk() { p=$1; allowed=" $2 "; case $p in net.ipv6.*) [ -d /proc/sys/net/ipv6 ] || return 0;; esac; v=$(sysctl -n "$p" 2>/dev/null) || { echo "$p: not available"; return 1; }; case "$allowed" in *" $v "*) ;; *) echo "$p is $v (running)"; return 1;; esac; sd=$(readlink -e /lib/systemd/systemd-sysctl || readlink -e /usr/lib/systemd/systemd-sysctl); f=$("$sd" --cat-config 2>/dev/null | grep -Po "^\h*${p//./\.}\h*=\h*\K\H+" | tail -n1); [ -n "$f" ] || { echo "$p is not set in any sysctl configuration file"; return 1; }; case "$allowed" in *" $f "*) ;; *) echo "$p is $f in configuration"; return 1;; esac; }; if chk net.ipv6.conf.default.forwarding 0; then echo compliant; fi- 예상 출력
compliant
조치 방법
조치 방식: 가이드 또는 인프라 패치
1. Review all files being used by systemd sysctl and comment out or remove all net.ipv6.conf.default.forwarding lines that are not net.ipv6.conf.default.forwarding=0. Example script: #!/usr/bin/env bash { l_option="net.ipv6.conf.default.forwarding" l_value="0" l_grep="${l_option//./(\\.|\\/)}" a_files=() l_systemdsysctl="$(readlink -e /lib/systemd/systemd-sysctl \ || readlink -e /usr/lib/systemd/systemd-sysctl)" a_files+=("/etc/sysctl.conf") while IFS= read -r l_fname; do l_file="$(readlink -e "${l_fname//# /}")" [ -n "$l_file" ] && ! grep -Psiq -- '(^|\h+)'"$l_file"'\b' \ <<< "${a_files[*]}" && a_files+=("$l_file") done < <("$l_systemdsysctl" --cat-config | tac | \ grep -Psio -- '^\h*#\h*\/…
속성
- 운영 체제
- rocky-9
- 태그
- cis-convertedkernellinuxsysctl
- 참고 자료
- CIS Rocky Linux 9 Benchmark v3.0.0 - 3.3.2.2
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