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pages.zh/linux/nft.md
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# nft
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> 允许配置由Linux内核防火墙提供的表、链和规则。
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> Nftables替代了iptables。
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> 更多信息:<https://wiki.nftables.org/wiki-nftables/index.php/Main_Page>。
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- 查看当前配置:
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`sudo nft list ruleset`
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- 添加一个新的表,家庭为"inet",表名为"filter":
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`sudo nft add table {{inet}} {{filter}}`
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- 添加一个新的链以接受所有入站流量:
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`sudo nft add chain {{inet}} {{filter}} {{input}} \{ type {{filter}} hook {{input}} priority {{0}} \; policy {{accept}} \; \}`
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- 添加一条新规则以接受多个TCP端口:
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`sudo nft add rule {{inet}} {{filter}} {{input}} {{tcp}} {{dport \{ telnet, ssh, http, https \} accept}}`
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- 添加一条NAT规则,将所有来自`192.168.0.0/24`子网的流量转换为主机的公共IP:
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`sudo nft add rule {{nat}} {{postrouting}} ip saddr {{192.168.0.0/24}} {{masquerade}}`
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- 显示规则句柄:
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`sudo nft --handle --numeric list chain {{family}} {{table}} {{chain}}`
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- 删除一条规则:
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`sudo nft delete rule {{inet}} {{filter}} {{input}} handle {{3}}`
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- 保存当前配置:
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`sudo nft list ruleset > {{/etc/nftables.conf}}`
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