18.2. 在现有规则中添加计数器

流程

1. 在链中显示规则及其句柄：

   # nft --handle list chain inet example_table example_chain
   table inet example_table {
     chain example_chain { # handle 1
       type filter hook input priority filter; policy accept;
       tcp dport ssh accept # handle 4
     }
   }

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2. 通过使用 counter 参数替换规则来添加计数器。以下示例替换了上一步中显示的规则并添加计数器：

   # nft replace rule inet example_table example_chain handle 4 tcp dport 22 counter accept

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3. 显示计数器值：

   # nft list ruleset
   table inet example_table {
     chain example_chain {
       type filter hook input priority filter; policy accept;
       tcp dport ssh counter packets 6872 bytes 105448565 accept
     }
   }

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