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最新推荐文章于 2025-05-29 13:37:11 发布

原创最新推荐文章于 2025-05-29 13:37:11 发布 · 513 阅读

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本文详细介绍如何通过修改配置文件来增强Linux系统的安全性，包括fstab、sshd_config和sysctl.conf等关键文件的设置，以及如何正确配置host.conf以防止IP欺骗。

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1、

vi /etc/fstab

tmpfs /run/shm tmpfs defaults,noexec,nosuid 0 0

2、
vi /etc/ssh/sshd_config

AllowUsers lhadmin@*.*.*.*

3、
vi /etc/sysctl.conf

# IP Spoofing protection
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
# Ignore ICMP broadcast requests
net.ipv4.icmp_echo_ignore_broadcasts = 1
# Disable source packet routing
net.ipv4.conf.all.accept_source_route = 0
net.ipv6.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.default.accept_source_route = 0
# Ignore send redirects
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
# Block SYN attacks net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 5
# Log Martians net.ipv4.conf.all.log_martians = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
# Ignore ICMP redirects
net.ipv4.conf.all.accept_redirects = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
# Ignore Directed pings
net.ipv4.icmp_echo_ignore_all = 1