# 公网地址互联

创建 IP Transit 时，您可以启用**公网地址互联**，为互联链路分配一个公网 IPv4 地址块。默认不启用。

默认状态下，复选框未勾选，页面不展示任何额外配置项。

<figure><img src="/files/bNLFyo0yfT1uwpBPL3eN" alt=""><figcaption><p>公网地址互联 — 默认未勾选状态</p></figcaption></figure>

勾选后，互联地址块选择区域展开，默认选中 IPv4/31。

<figure><img src="/files/JisKByJIm4BsmpIAsmR9" alt=""><figcaption><p>公网地址互联 — 勾选后展开互联地址块配置</p></figcaption></figure>

{% hint style="info" %} <mark style="color:blue;">**注意**</mark>

<mark style="color:blue;">公网地址互联仅支持路由模式（静态路由）和路由模式（BGP），不支持网关模式。创建后不可修改。</mark>
{% endhint %}

## 互联地址块大小

勾选**公网地址互联**后，选择互联地址块大小：

| 地址块     | 可用地址数    | 说明                             |
| ------- | -------- | ------------------------------ |
| IPv4/31 | 2 个（点对点） | 无网络地址和广播地址消耗，适合点对点互联，**默认推荐**。 |
| IPv4/30 | 4 个      | 含网络地址和广播地址，适合需要这两类地址的场景。       |

## 费用

勾选后，订单概览中将在「公网 IPv4 地址块」费用行下方新增互联地址费用明细。取消勾选后，费用明细同步移除，总价恢复原始金额。

<figure><img src="/files/qW2yUje8Oc5q7KTIcHmh" alt=""><figcaption><p>订单概览 — 勾选后新增互联地址费用明细行</p></figcaption></figure>


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