I'm setting up a laptop for someone, using OpenBox without a display manager (i.e. the user types startx). This person will primarily be using wireless at home, but will want to use public wifi as well. I've not had to do much with wireless in Arch (or Linux in general), so I may be (likely am) missing something; I'm certainly missing some experience. Also, I haven't used Arch in a year or so; I chose Arch for this since its installer actually worked on the laptop. This has been my first time working with systemd (I've been doing RHEL 6 at work for several years). I wonder if that's part of my problem?
However when I use wifi-radar (had to put the user into the wheel group to get anywhere) I get the message that it could not obtain an ip address. Running 'ip a' shows two address on my wired ethernet, leading me to believe that dhcpcd is being run twice. When I edited the home wifi profile in /etc/wifi-radar.conf, setting "use_dhcp=False", wifi-radar hangs when I try to connect.
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I'm not sure that'll even do it. Many times you need to disable it completely and let the manager manage that interface as well. wifi-radar seems to be specific to wifi, so it may be different, though.
BTW, I realize that my issues aren't really Arch specific (well, maybe wifi-radar hanging when I set 'use_dhcp=False' is). If there's a good site to read about the pros/cons and philosophies of the various ways of managing wireless in modern Linux, I'm fine with reading it.
I use netctl and wifi-menu. But, were I setting up a machine for someone else, I would use wicd. It has CLI interfaces, curses interfaces, and a nice GUI/tray interface. It manages wired and wireless, provides site surveys, and manages pass phrases.
I am trying to connect to my wifi network. Using the standard connection manager in linux mint 13 xfce was not a good idea. No wifi networks are shown there. and when I left-click on it, the wireless are is gray.
I found the tool called wifi-radar which shows all available networks around. But connecting to the right network is not possible so far. I seem to have configure a lot of things to get it right. However, I receive a dhcp error and I am trying to refer the dhcp setting right. In wifi-radar, it refers to this path:
and for the ssid settings: I have a WPA security set. So I guess I have to add it as the tool does not seem to recognize this automatically (why not? the windows xp zero configuration utility does not seem to be so bad at all).which settings for my wifi network do I have to set?
So weird thing happened Tuesday which I brushed off and was like Eh. Users were reporting getting kicked off wifi and re-associating. So I went to check it out and stood there till I saw it happen. I looked at the AP and in channel it said Radar detected and it was trying to switch to another channel. Mind you I caught it quick and without thinking forgot to take a screenshot or remember exactly what it said and rebooted AP. Now I have DFS channels excluded already so why is it still triggering? Also an fyi we are around the area of an air force base 4.4 miles and I feel as if sometimes it's only that building that gets affected and only sometimes. Happened Tuesday might not happen till 2 months from now. Any thoughts?
What is the channel width set to? 20, 40, 80? The channels may be excluded, but if the width is set to high it might overlap. I've not worked with this setting because I have no radar in the area. I'm making the assumption that even if the channel is excluded you might still have some of the overlap.
I live in a radar hell-hole, surrounded by military activity, next to the biggest shipping lane in the world, and incidentally underneath the preferred flight path of cargo operators moving specialised loads in AN-124s (old weather radar), with frequent bad weather and storms (a bit like Wellington, but without the cable car).
Some (older) airfield weather/ILS systems can cause WiFi issues, these systems tend to be used infrequently. Fortunately, it isn't as bad as the situation close to Schiphol's rather distant fifth runway where the radar causes WiFi "failure" frequently in bad winters.
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I had set a 5 GHz Wi-Fi AP to use DFS channels and it didn't go well. To understand whether this was due to getting signals from privileged sources (i.e. radar), I'd like to have a way to listen for radar signal on the channels.
If you were just looking for interference in general, not specifically radar signals triggering DFS channel switches, a 5GHz spectrum analyzer, such as a MetaGeek Wi-Spy DBx, would do. However, a spectrum analyzer mostly just graphs how much energy it sees on various frequencies over time, without actually being able to differentiate between Wi-Fi, radar, and other things that use 5GHz. So it wouldn't give you any insight into whether radar-triggered DFS channel switch events are happening.
If you specifically want to see if your equipment is detecting radar on DFS channels and switching channels because of it, you should enable verbose logging on the Wi-Fi subsystems/drivers of your APs and client devices, and watch for radar/DFS/channel-switch events in the logs (the details on how to do this can vary wildly between platforms and Wi-Fi chipsets, and is beyond the scope of this question).
i just downloaded the ubuntu 23.04 version in my pc and now am not able to connect to wifi , i tried various online commands available and tried to use Hidden networks but its not working so i am here asking some solution to this.
1. Go to System>Administration>Synaptic Package Manager
2. Hit the search button and type in "wifi-radar" (sans quotes)
3. Hit the white box and click "Mark for installation" on the menu that appears
4. Click Apply, then Apply again.
I live in an extremely congested area (Los Angeles), so I've been trying to get the 5Ghz on my Archer C7 v2 running on radar detection channels. If it's applicable, it's running as an AP with an OPNSense device acting as the main router/firewall. The output of iw list on my device is as follows (abridged to what I believe to be the relevant section):
The weird thing is, I don't see any mention of radar detected in the logs. Furthermore, LUCI presents these channels as available to me, that is, channels 100-144 are available in the dropdown. My device driver is set to 'US', and I've tried switching between manually setting it to 'US' and back to 'default' to no avail. I'd appreciate any help on this! I feel like there might just be some option I'm neglecting to set, but I can't figure out what that might be.
Also, I'd be grateful if anyone could tell me if there's some kind of utility in OpenWRT that allows you to scan for radar without needing to manually check every channel. I've scoured these forums and reddit but haven't found anything aside from scripts that just automate that process.
Since DFS may require changing channels you should specify a list of channels instead of one:
option channels '52 56 60 64 100 104 108 112 116 120 124 128'
That should result in first finding a channel with few neighbors, then scanning it for radar for 1 minute, if radar is found it will try a different one. RADAR events other than from a nearby TDWR tend to be very random, probably from passing military aircraft.
So now comes the ask: have any of you who have been experiencing wifi issue live near an airport? Are any of you using a commercial grade network rig (Ubiquiti, Cisco, etc) and have some advanced metrics that you can share?
What is a DFS channel? These channels share the spectrum with Weather Radar and Radar systems. For the FCC and IEEE to approve the use of these channels in WIFI, a mechanism had to be in place where these channels could co-exist. A mechanism called DFS (Dynamic Frequency Selection) was created to have the WIFI devices listen for radar events and either stop using the channels or automatically move off these channels. When RRM/ARM is used, and an AP hears a radar event it must pick a new channel and inform its clients to move to this new channel. If RRM/ARM is not used, then AP after hearing a radar event must stop transmitting for 30 minutes.
There are 16 DFS channels in the UNII-2 and UNII-2e space (52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, and 144). These channels have two major drawbacks, especially for voice clients. These drawbacks are 1.) The length of time it takes for a client to scan DFS channels. 2.) When radar events are heard the APs and device must move off that channel. The rest of this blog I will talk about these two issues.
802.11 stations, before they transmit in a DFS channel, must validate (listen for 60 seconds) that there is no radar activity on it. And, if an 802.11 radio detects radar while the DFS channel is used, it must vacate that channel quickly. Thus, if a radio detects radar in its serving channel, then switch to another DFS channel, this then imposes (at least) a one-minute outage.
A "false DFS event" is when a radio falsely detects radar. It sees an energy pattern that it believes is radar, even though it is not (it is possibly a signal from a nearby client radio). It is very difficult to determine whether or not radar detection events are "false". If there are multiple AP radios on the same DFS channel in the same location, then we can assume, as a rule of thumb, that if a single AP detects radar at a given time, then it is probably false detection, while if multiple radios detect radar at the same time, it is likely "real" radar. be457b7860
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