如果你正在为一个拥有大量设备的家庭购买一台新路由器，你可能会想，它是否可以同时处理所有这些设备而不出问题。今天的超级用户问答文章关注的是一位读者在准备为一个使用量大的家庭购买新路由器时所面临的争论。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

照片由安东尼奥·尼古拉斯·皮纳（Flickr）提供。

问题

超级用户读者MyDaftQuesti***想知道路由器是否对可以同时连接的设备数量有限制：

I am going to buy a new router, but I have just realized that for nearly all the routers I have looked at (Belkin, Netgear, D-Link), they do not state the maximum number of devices that can connect concurrently.

I have a D600 and have looked on their website, through the manual, and also found no mention of the limit (which I really need to know if there is one due to debugging another issue).

The new router will be a gift for a friend. The issue is, they have 12 devices in their house, all of which require Wi-Fi, and another 3 devices which will be hard wired.

Since the router websites do not mention any limitati***, can I assume there is a general limit on what the number of concurrently connected devices can do? Or is the issue more about understanding that, the more devices that are connected, the worse the performance will be due to the sharing of the resource?

My question is, without physically trying it, is there any way to know that a certain device will work with a given number of concurrently connected devices?

可以同时连接到路由器的设备数量有限制吗？

答案

超级用户贡献者D.Kasipovic和Daniel B为我们提供了答案。首先，D.Kasipovic：

I do not think there is a limit to the number of devices that can connect. It would make more sense that most routers are limited by their hardware, and will experience performance degradation as the number of devices increases.

This I suppose, largely depends on the speed of the router’s CPU and available RAM, but it would also largely depend on the services running on the router, i.e. is NAT enabled, QoS, VPN, access control, is wireless open or password protected, etc. I think the amount of traffic that devices create is also an important factor to the limit.

I think this might also be the reason why manufacturers do not specify the number of devices that can connect, because it depends on many factors.

接着是丹尼尔B的回答：

There is a (theoretical) absolute limit of 65,535 concurrent connecti***. When using SNAT or MASQUERADE, that is. As such, the maximum feasible number of devices would be somewhere near 800, to account for closing and opening connecti***.

Naturally, this would require a network larger than /24, which poses no problem with OpenWrt and the like. Still, the connection tracking load would be quite high.

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