关于通过Ethernet cable构建单Wi-Fi网络并实现无缝漫游的设备选型咨询

Hey there, let's break down the right gear for your setup, based on whether you can tweak your ISP router's settings or not:

1. 如果你的ISP路由器允许调整基础Wi-Fi配置 #

Go with a 无线AP（Access Point） — this is the most straightforward option:

• Plug the AP directly into your router via Ethernet.
• Configure the AP to use the exact same SSID, Wi-Fi password, and encryption type as your router's Wi-Fi network.
• Pick a non-overlapping Wi-Fi channel (e.g., if your router uses channel 1, set the AP to 6 or 11) to avoid signal interference.
• If the AP supports 802.11r（快速漫游）, enable it — this lets your phones/laptops switch between the router and AP almost instantly without dropping connections.

This setup keeps everything on one unified Wi-Fi network, just like you want.

2. 如果你的ISP路由器锁定了设置或功能有限 #

No sweat, you still have reliable options:

• 支持有线回程的Mesh Wi-Fi系统: Get a Mesh kit where one node connects to your ISP router (set this main Mesh node to AP mode if your ISP router already handles internet access), then run Ethernet to the second Mesh node in the distant part of your house. Mesh systems are built for seamless roaming out of the box, and wired backhaul ensures a stable, fast connection between nodes.
• 将普通无线路由器设置为AP模式: Grab a standard router, disable its DHCP server, connect one of its LAN ports (not the WAN port!) to your ISP router's LAN port, then match the SSID, password, and encryption to your existing Wi-Fi. This works just like a dedicated AP and is often a more budget-friendly pick.

实现无缝漫游的关键注意点： #

• 两个设备的SSID、密码、加密方式必须完全一致 — 这是设备自动漫游的前提。
• 避免使用重叠的Wi-Fi信道，防止信号冲突影响体验。
• 如果追求最流畅的切换效果，优先选支持802.11r（快速漫游）的设备。

备注：内容来源于stack exchange，提问作者ironcito