ROBIN -  Open Source Mesh Network Forum Index ROBIN - Open Source Mesh Network
users community forum
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

OM2P Questions

 
Post new topic   Reply to topic    ROBIN - Open Source Mesh Network Forum Index -> Open-Mesh
View previous topic :: View next topic  
Author Message
Ads






Posted: Fri Dec 15, 2017 8:35 am    Post subject: Ads

Back to top
lorell
User
User


Joined: 03 Feb 2009
Posts: 25

PostPosted: Wed Jul 04, 2012 9:56 pm    Post subject: OM2P Questions Reply with quote

Greetings!

I have recently deployed a network of 72 OM2Ps in a 16-story dorm. The environment is a major city in the USA that has a lot of other 802.11b/g traffic in the area. There are 200 other radios that can be seen from the site survey tool in the control panel. The noise floor is higher than normal at around -80 to -85.

With an average of 4.5 radios and 16 rooms per floor, the average signal strength is around -65. With the extra power of the OM2Ps, the signal strength in the rooms with the OM2Ps is -10 to -20 and the lowest signal I've seen on property is -80, but that is in areas that I don't care about, like hallways.

So coverage (signal strength) is not really a problem. If anything, the signal may be too strong in some cases.

Because of my worries of self interference and interference from other adjacent WiFi, I have over ridden the single channel configuration and have gone to a five channel configuration where the channels are not adjacent. Sure, there are only three non-overlapping channels in the 802.11b/g spectrum.

Important to note is that all of the radios are POE powered with the official passive POE device with the 18V power supply.

Finally, my OM2Ps are running fw-ng-r397.

Problem #1: In some areas at least, connectivity seems to be intermittent. We went through a testing procedure that narrowed down the connectivity problem to the rate limiting function on SSID #1 of the OM2Ps.

On the test laptop, we set up three pings at the same time. One to the default gateway of the wifi-connected laptop. One to the default gateway of the OM2Ps which is the internet router for the LAN. One ping to 4.2.2.2. Our testing showed solid pings with no packet loss to the connected OM2P with rate limiting down around 2 Mbps up and down.

Code:
Rate Limiting   Ping to OM2P   Ping to Router   Ping to 4.2.2.2
2 x 2 Mbps      solid          packet loss      packet loss
10 x 10 Mbps    solid          packet loss      packet loss
22 x 11 Mbps    solid          solid            solid


The third option is with the rate limiting at its highest possible setting.

Question #1: This is the biggie. Is there an issue with rate limiting in OM2P? Does it cause packet loss and connectivity issues when implemented? Is it just this software version?

Question #2: Should I just use the normal, single channel configuration? There is no single channel that looks like a good candidate throughout the building.

Question #3: Despite all radios having a direct connection to a switch located within a floor or two, about 10% of them are in repeater mode. We reboot them and they may or may not go into gateway mode. Why is this happening? How do I keep all of them in gateway mode?

Question #4: One thing I have noted is that the radios in repeater mode only seem to connect to other radios that are on the same channel. Is this by design?

Thanks,

Lorell Hathcock
Back to top
View user's profile Send private message
lorell
User
User


Joined: 03 Feb 2009
Posts: 25

PostPosted: Tue Jul 10, 2012 4:30 am    Post subject: Reply with quote

Nothing? No ideas?
Back to top
View user's profile Send private message
sronan
Skilled User
Skilled User


Joined: 17 Feb 2008
Posts: 211

PostPosted: Wed Jul 11, 2012 4:37 am    Post subject: Reply with quote

This message board is intended to support ROBIN, but not ng, on open-mesh devices. Why not submit a ticket with the folks at open-mesh.
Only registered users can see links on this forum!
Register or Login on forum!



I have no expertise with ng but am interested in your experience... and offer a few thoughts, but take 'em with healthy skepticism.

Quote:
Question #1: This is the biggie. Is there an issue with rate limiting in OM2P? Does it cause packet loss and connectivity issues when implemented? Is it just this software version?


You refer to packet loss. I'm curious to know how much packet loss? That Question #1 (with more specific data on degree of packet loss included) seems like a good one to ask Marek via a ticket at cloudtrax.

Quote:
Question #2: Should I just use the normal, single channel configuration? There is no single channel that looks like a good candidate throughout the building.


How are you deciding what devices to have on what channels. My inclination in a situation like that might be to use two channels. Say channel 9 on floors 1,2,3,7,8,9,14,15,16 and channel 2 on floors
4,5,6,10,11,12,13. It's easy to underestimate how often someone's best connection will be to someone above or below rather than on the same floor.

Quote:
Question #3: Despite all radios having a direct connection to a switch located within a floor or two, about 10% of them are in repeater mode. We reboot them and they may or may not go into gateway mode. Why is this happening? How do I keep all of them in gateway mode?


What are you using for a DHCP server? All 72 devices are using that? Do you have great confidence in it? Is it always the same, or a random set of devices that fail to successfully pick up an IP address and go into gateway mode? I wonder if the ng system for using fixed IP addresses would be viable and helpful in the context of your situation:

Only registered users can see links on this forum!
Register or Login on forum!



Quote:
Question #4: One thing I have noted is that the radios in repeater mode only seem to connect to other radios that are on the same channel. Is this by design?


I would think that yes, if you have set those devices to use a particular channel, they would connect just to the other radios set to use the same channel. Were you thinking that they might hop channels looking for a better link with another gateway using the same SSID?
Back to top
View user's profile Send private message
sronan
Skilled User
Skilled User


Joined: 17 Feb 2008
Posts: 211

PostPosted: Wed Jul 18, 2012 3:20 pm    Post subject: Reply with quote

In regard to Question 3, this may be related:
Only registered users can see links on this forum!
Register or Login on forum!

Back to top
View user's profile Send private message
harry_the_face
Power User
Power User


Joined: 24 Aug 2009
Posts: 254

PostPosted: Mon Jul 23, 2012 12:01 am    Post subject: Reply with quote

TO Q#4 Yes a node will only connect to a node on the same channel. If you want everything in the building to mesh then it all has to be on the same channel.

I have had connection issues from to much interference and changing channels solved the problem. You can also go on the cloudtrax dashboard and adjust the TX power down and see if that helps.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    ROBIN - Open Source Mesh Network Forum Index -> Open-Mesh All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
c d
e



Powered by phpBB © 2001, 2005 phpBB Group

Abuse - Report Abuse - TOS & Privacy.
Powered by forumup.it free forum, create your free forum! Created by Hyarbor & Qooqoa
Confirmed

Page generation time: 9.17