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It's usually best to enable every mode offered by your router, rather then a subset of those modes. All devices, including older devices, can then connect using the fastest radio mode they support. This also helps reduce interference from nearby legacy networks and devices.

Each band of your router is divided into multiple, independent communication channels, like lanes in a street. When channel selection is set to automatic, your router selects the best Wi-Fi channel for you.

If your router doesn't support automatic channel selection, choose whichever channel performs best in your network environment. That varies depending on the Wi-Fi interference in your network environment, which can include interference from any other routers and devices that are using the same channel. If you have multiple routers, configure each to use a different channel, especially if they are close to each other.

Make sure that your device has Location Services turned on for Wi-Fi networking, because regulations in each country or region define the Wi-Fi channels and wireless signal strength allowed there. Location Services helps to ensure that your device can reliably see and connect to nearby devices, and that it performs well when using Wi-Fi or features that rely on Wi-Fi, such as AirPlay or AirDrop.

Lets say all connected users receive updates regarding modifications to every post - there is no reason to have post based topics. All the updates can be broadcasted to say common post_updates channel/topic. At the minimum you will have 1 socket and 1 channel for pushing updates to a user.

Everything was working fine, then I remembered to change channel on the radio, so I choose channel 11 and 13 for 2.4 GHz, and ch. 36 and 64 for 5GHz. But after applying changes, radio0 (5GHz) on AP number two reverted back automatically to channel 36. So now both are working in the same channel. Is this a bad thing ? Actually I see no issues at all.

Can I leave it in this config or is better to force a change ? And in case, which channels are the best choice ?

Your 5GHz radio moved to channel 35 probably because it detected a radar on channel 64, or it is not available in your country; have a look at _of_WLAN_channels#5_GHz_(802.11a/h/j/n/ac/ax) for more info.

Now last question: let's say for a moment that bandwidth is not an issue, so using the same channel for roaming APs is safe and can even give a small benefit (faster jump). But if the same channel is shared across access points of completely different networks, can this create problems, also from a security point of view ?

This is to understand whether it is better to fix channels but leaving the possibility that some neighbour uses the same, or let the AP decide which to choose on a "least populated" basis ?

AFAIK, OpenWrt does not really support auto-configuring AP channels, and the "auto" value is interpreted as "first channel in that band"; so, you are going to have to choose a channel yourself. Get one of those "wifi analyzer" app for your phone, see which channels are used by your neighbors around you, and choose one channel.

If you APs allow channel 13 then according to _of_WLAN_channels 1, 5, 9, 13 allow 4 (almost) non-interfering channels. In reality use a wifi scanner like kismet to figure out what the APs in your surround are using.

Sidenote it seems better to have two APs on the same channel as compared to two directly neighboring channels as in the first case they can arbitrate their tx-slots while in the second case they simply add noise to each other. In both cases bandwidth is going to be reduced if the neighbor is active...

I believe it would be best if people would manually select the channels, or better if there was a way of restricting the auto method to restrict itself to a sane subset of channels (1, 5, 9 in the US, 1, 5, 9, 13 in europe). The big problem simply is that the nominal 12-14 channel center frequencies one can select do not map into the same number of non-interfereing/non-overlapping 20MHz channels. This probably is great in areas without other APs around as it will allow to select the best frequency with a nice granularity, but it certainly is suboptimal in the more typically RF-crowded areas.

In my experience, one is either in an area where there is RF congestion, or one that is quiet. If in a congested area, it seems to change by the minute. A channel scan might suggest that one channel is "clearer" than others (as many APs seems to default to channel 1), but getting two, "non-overlapping" channels free is a rarity. I'm not aware of any successful, non-impactful implementations of dynamic channel selection in consumer-grade APs.

I go with the US non-overlapping channels of 1, 6, and 11 with a preference to avoid channel 1 as it seems to be the "auto" selection of other APs (OpenWRT or not). I used to try to use a channel scanner when I was in the city, but found it a futile effort, even before the explosion of wireless APs.

On 5 GHz, things will be very different due to radar/DFS. I just avoid the impacted channels as I'm close enough to airports and all that I assume that they're all filled one way or another. As I use wireless backhaul between APs, I can't have channel switching.

And I wish everybody would go with the 1, 5, 9, (13) instead, as that scheme will work virtually everywhere. If there are no other APs/Stations in the vicinity it does not matter one whit and unless everybody else is using 1, 6, 11 the probability is high that those users on channels 2,3,4,5, and 7,8,9,10 will cause more interference than the slightly larger sideband overlap in the 1,5,9 scheme as compared to 1,6,11. But I realize that is wishful thinking...

Avoiding 1, seems like a good idea; my experience with a channel scanner is more positive than yours, but the main thing I use it for is to detect whether there are other APs around or not, not so much for exactly selecting a channel as most other APs are pretty variable...

While you are right in principle, it's a losing game. Way too many APs use 1, 6, 11 - and way too many wlan cards sold in non-FCC regions don't allow channel 12, 13. Unless you are far away from other wireless stations, 1, 6, 11 is sadly the only option that doesn't create even more havoc.

Couldn't we just have openwrt auto pick randomly from 1,6,11 ? Here in the US it's actually more and more common to see these as the main channels, I think vendor firmwares default settings seem to hop between them on some basis.

Have to agree, my neighborhood in germany currently exclusively uses 1, 6, 11. I really really wish the initial recommendation would have been the world usable 1,5,9,(13), but that train has left the station. On the upside this looks better than the broad mixture of all channels I have seen in the past, so progress!

Yep, definitely progress. The default algorithm for many vendor firmwares I'd say does hop, because I've seen my neighbors hopping around. What I've found is that picking a setting 1,6,11 and sticking to it is best, let the vendors hop around me.

APs should be deployed in such a manner that wireless clients experience minimal packet loss and choose the AP with the strongest signal when roaming. In order to achieve this, neighboring APs will need to be close enough so that their coverage cells have some overlap. When APs have overlapping coverage they should be set to different non-overlapping channels. This prevents the APs from causing an increase in channel utilization or interfering with each other.

The Cisco Meraki wireless system provides two features (auto channel selection and power reduction) that automatically adjust the channel settings and power levels of neighboring APs in the same network with the goal of providing strong wireless coverage while preventing an increase in channel utilization or causing interference. In certain high density deployments however, these features may not be aggressive enough. In these instances, a Dashboard administrator can use RF measurements from a site survey to perform manual channel and power selection to fine tune the wireless network. e24fc04721

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