To unite networks of two offices. WiFi?

Question

WiFi

Good evening, Habr!
There are two offices, their windows look at each other. 30 meters between them. Direct visibility, basically.
Those. very good conditions for wifi.
It is necessary that in office B the router distributes the Internet that is in office A. Accordingly, there are two wi-fi routers.
As I understand it, all this is possible on dd-wrt, bridged mode, right?
According to the settings - is it worth including n? Or does it not affect the range / quality?
One of the routers is TP-link 1043nd. Buy the second one the same? or is there something more suitable?
And on antennas, does it make sense to communicate with directional ones? What can be done to improve the quality of communication?

Answer 1

at 30 meters, it generally makes sense to connect with antennas, since there will be no speeds with standard antennas. Directed better - so that there will be fewer interfering factors. Plus, according to the law, a license does not require the use of wi-fi only indoors, so directed in this case is an extra way not to glow.

Answer 2

You can ask a stupid question: is it impossible to forward these 30 meters in pairs? It's inexpensive and simple. You get a stable channel and a minimum of problems with neighbors (I once had problems with this and I don’t want to repeat the experience).

Answer 3

1. There is a repeater mode in most of them.
It turns out that something like:

As a result, all computers see the router that is in office "A".
2. N affects the transmission speed, as well as the range, so it's better to turn it on.
3. Directional antennas, in my opinion, are optional, it is enough to provide direct visibility. But you can act according to the situation.
4. I can’t say about the routers, but as the main router, it’s better to take something more powerful. all routing will be assigned to it.

Answer 4

There are not many differences. With a workgroup configuration, one point will work in Access Point mode, the second in client mode. With a bridge configuration, one access point will be a root bridge, the second is a non-root bridge. From this it follows that in the first variant, clients can connect to a point that operates in AP mode, but not in the second. In both options, bridges will be transparent to clients, i.e. one subnet is used.

Answer 5

I would do this - apart from Wi-Fi networks in two offices, I would buy two more reliable routers with a connector for a plug-in antenna that supports various modes, and a repeater and, especially, a wireless bridge (bridge). Then 2 directional antennas (if there are no obstacles between the office windows and there are no trees / wires / structures even near the line between the windows, then you can stop at relatively small and cheap antennas. But keep in mind that the reliability of this entire chain depends very much on them, and I I was convinced from my own experience that it is not good to fence a long chain of wireless devices).
Those. in fact, we have a Wi-Fi network with the Internet in one office and a Wi-Fi network in another office without the Internet, which must be connected, as well as two routers that will do this. This should make it more reliable and easier to diagnose problems. Well, the performance will turn out, because. routers do not have to communicate with clients and each other at the same time.
In principle, 30m is not much for directional antennas with a standard transmitter in the router and line of sight, but you need to take into account a couple of nuances - 1. Some renters provide local Internet at extortionate prices, while others do not. It is in such cases that tenants often begin to block such remote Wi-Fi connections. If the critters find out, they can try to jam the Wi-Fi signal.
2. It is very important to consider how critical the Internet is in the office where we deliver it. If there are, for example, cash registers that cannot do without it (well, or without a network) and the work completely stops, you should invest more in network equipment (routers and antennas).
3. In any case, you should encrypt the channel through which Wi-Fi is transmitted between offices (as well as intra-office WiFi), but you should also remove the SSID broadcast, and in general, in addition to these measures, it is desirable to pass everything through VPN.
A lot can happen if this data link is left vulnerable. If you don’t take care of it right away, you risk never knowing where it came from.
All IMHO

Answer 6

If you need to resolve the issue of legality, as well as high speed requirements (Wi-Fi, moreover, is unreliable, it’s enough to set up an access point for your neighbors, so even at such not very large distances, at best you will get tens of megabits), then ...
... direct visibility may allow the use of atmospheric optical links , i.e. data transmission over the beam - potentially higher speed, and expandable (when building 'cellular' networks or using repeaters), i.e. each channel does not interfere with the other.
ps on Habré there was even a review of such devices with examples (hundreds of meters and megabits, quite lifting prices, even for small businesses, especially if the 'Chinese' try, and not the domestic 'sticker industry'), but I can't find it.

Answer 7

In this case, I would use ubiquiti nanostation in bridge mode. There will be no problems at 30 meters (and at 200 meters too), they have built-in antennas (the angle is about 60 degrees), they are convenient for installation, because The power goes through the PoE adapter. Pleased with the low cost as well.

Answer 8

Do offices have a common PBX? If the wires are already stretched out anyway, VDSL can easily replace Wi-Fi.