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I have two wireless SSIDs, one for internal and the other for guest users.

Both of these are ran through a sonicwall. Originally it had a sonicpoint hooked up to it so I suspected that. I replaced it with a Ubiquiti AP pro and guess what, it does it too.

If one stabilizes the other will keep dropping. I want to say every 7-15 seconds it drops, comes back up, drops comes back up. If I disable one the other one is ok and it alternates between the two, so one day internal sucks, the other day guest sucks.

Any advice would be great.

Thanks!

*edited for terminology.

Edited Jul 20, 2018 at 13:08 UTC
CrashFF
Datil
OP
CrashFF

On a Unifi AP, leave both 5 and 2.4 enabled, and leave the channel and power settings to Auto, and enable band steering. this allows the AP to manage what channel and how much power is used to help reduce interference. Most multi-SSID capable AP's use the same channel for both SSID's no matter what settings. there are only a handful that I know of that will allow you to specify separate channels for each SSID, and most require DD-WRT firmware.

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8 Replies

· · ·
CrashFF
Datil
OP
CrashFF

You must have something else causing interference with that channel.

On a Unifi AP, you should leave it set to AUTO for power and channel selection. The internal software is designed to avoid interference like that.

(After re-reading the OP, I think there is a significant chance of miscommunication and incorrect terminology in use here)

1
· · ·
Techelp
Thai Pepper
OP
Techelp

CrashFF wrote:

You must have something else causing interference with that channel.

On a Unifi AP, you should leave it set to AUTO for power and channel selection. The internal software is designed to avoid interference like that.

(After re-reading the OP, I think there is a significant chance of miscommunication and incorrect terminology in use here)

Agreed - does the OP mean SSIDs being broadcast rather than channels? Depending on how many antennas and the 802.11 spec being used depends on how many channels a single AP could simultaneously send out on. Generally, I'd expect 1 channel for an AP that dishes out multiple SSIDs on that one channel. 

OP, do you want to clarify whether you mean SSIDs or whether it really is a channel issue? You can use a free tool to check channels in use by using INSSIDER - definitely a great tool to have.

0
· · ·
leeyang
Pimiento
OP
leeyang

My apologies, I meant SSID, one of them keeps falling off then coming back up. Had a long day, was trying to get out of the office.

0
· · ·
CrashFF
Datil
OP
CrashFF

There is something going on that sounds like a severe misconfiguration somewhere - likely in a switch or the sonicwall. Sonicpoint AP's and Unifi AP's have very different configurations, and for the same issue to be occuring on both points to the issue being further up the chain in the network connections.

 We need a LOT more detail to be able to help sufficiently.

How is the Unifi AP configured?

Your SSID's - are they both configured on the one AP?   Are they on separate VLAN's? Are the VLAN's on separate subnets? Are they DHCP or static? Where is the DHCP address coming from? What is the AP connected to? a PoE switch, managed switch, unmanaged switch, straight to the sonicwall?

0
· · ·
leeyang
Pimiento
OP
leeyang

Yes, both SSID's are off a single AP, both on 2.4ghz.

One on vlan 10, the other on vlan 11, AP is static with the last octet being .1, .100-.200 is fair game for all devices that want to connect and is handled via sonicwall dhcp setting.

The AP is drawing 15watts from a cisco 2960x, with the inline power set to auto. I want to say the distance is around 75-100 feet from switch to AP.

Since switching one SSID to 5ghz, both has been stabile. I did notice with the analyzer that when both SSIDs on 2.4 is broadcasted that they are on the same channel and not separated. 

0
· · ·
CrashFF
Datil
OP
Best Answer
CrashFF

On a Unifi AP, leave both 5 and 2.4 enabled, and leave the channel and power settings to Auto, and enable band steering. this allows the AP to manage what channel and how much power is used to help reduce interference. Most multi-SSID capable AP's use the same channel for both SSID's no matter what settings. there are only a handful that I know of that will allow you to specify separate channels for each SSID, and most require DD-WRT firmware.

0
· · ·
leeyang
Pimiento
OP
leeyang

Thanks for being patient with me Crash, just took over a role at a new place and the previous IT guy left weeks before I started so trying to sort things out as I go. Seems like keeping one SSID on 5 and the other on 2.4 is working well so unless someone says something I think I'll leave it as is. Strength is only 10db off each other at the far end of the building. I appreciate the help.

0
· · ·
CrashFF
Datil
OP
CrashFF

The reason to put them both on 2.4 and 5, and turn on band steering is that the AP will talk to the device, and if the device can use 5ghz, the ap will move it over. This helps cut down on interference, since the AP can use multiple channels, and the 5ghz band has more available.

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