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[宽带症候群] 家宽给了一个 22 掩码的公网 IP，我可以继续分配子网地址吗？

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ISP 用的是 DHCP 分配 IP 地址，今天打开路由发现给了一个掩码 22 的公网 IPV4 地址：122.xxx.xxx.xxx/22 。这是不是意味着我直接拥有了一个网段呢？我是不是可以把网段内的公网 ip 分配到下游设备上。我路由是 Openwrt 系统，我应该如何设置呢？

WAN 口: 协议: DHCP 客户端 运行时间: 15d 14h 10m 6s MAC: F0:B4:xx:xx:xx:25 接收: 1.15 TB (1136058618 Pkts.) 发送: 871.62 GB (978393171 Pkts.) IPv4: 122.xxx.xxx.xxx/22

LAN 口： 协议: 静态地址 运行时间: 32d 17h 21m 3s MAC: F0:B4:xx:xx:xx:26 接收: 859.71 GB (991356272 Pkts.) 发送: 1.18 TB (1155076814 Pkts.) IPv4: 192.168.1.1/24

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