MikroTik

jpjust

Maybe you can provide us with details about amount of traffic consumption by your users? You can check products performance test and compare it with you results: http://routerboard.com/pdf/routerboard_performance_tests.pdf Maybe there is the problem. My traffic is very low. Right now, ether2 (PPPoE...

jpjust

Hello guys. I have some unused RB450 and I had the idea to use them as PPPoE servers. My plan is to install at least 3 of them, so if one gets bad, there are still 2 to serve my customers. So, I tried only one first to test. Last week I got one of these RB450, updated it to ROS 5.2 and configured it...

jpjust

What's that noise control you are using?

jpjust

Hello, folks.

Does ROS send/respond RTS/CTS frames in 802.11b mode or it's only for 802.11g mode?

TIA

jpjust

Hello, folks.

I've seen that wireless-test has cts-to-self protection mode. When using cts-to-self, the AP still sensing the carrier before transmiting or it just sends a CTS to self and transmits?

TIA

jpjust

Is the "Disable CSMA" option on the Nstreame tab not what you are looking for?

-Louis

Yeah, but it's only for Nstreme mode. I was thinking about something for the general 802.11 mode.

jpjust

Hello folks. I'd like to suggest another medium access. I think most of problems WISPs have with interference is related to the exposed terminal problem. In my case, for example, I use sector antennas in my ERBs and directional antennas in my clients. When my RouterBOARDs transmit to a client, I'm s...

jpjust

ste:that's what I meant. This weekend I learned that cable length does matter. Sometimes, a long cable is better than a short one (but not so long). We have to consider the wavelength and other cable's attributes to determine the best size :) I'm still learning how to calculate the correct size. I c...

jpjust

Hello, folks.

I see some people talking about cutting the RF cable at correct lengths, to avoid standing waves (just as amateur radios do). What do you say about it? Should we really care? Or it doesn't has strong effects in microwaves links?

jpjust

I think DFS scans and selects only ONCE (when you enable the interface) ;) you can make use of scripting, to disable/enable interface at 3:00AM for example, to choose best frequency every night. also the DFS does something when it finds a RADAR. It won't work nice, because at 3 AM most of every com...

jpjust

So, channel usage is more important than noise? I've made some tests here and found out that noisy channels with few networks are better than clean channels with lots of networks. Am I right?

jpjust

I know Snooper already, but what I meant was something automatic.

jpjust

Hummm, didn't know about it.

So, I'd still suggest another feature, something like "Dynamic Channel Selection" or "Automatic Channel", which would do all those steps I've described before.

jpjust

Hello, folks, specially MikroTik developers. DFS is really a cool feature, it can simplify the process of choosing a channel. As the docs say: "AP scans channel list from "scan-list" and chooses the frequency which is with the lowest amount of other networks detected." So, I'd li...

jpjust

I've read somewhere that Adaptive Noise Immunity changes card's sensitivity dynamically to avoid interference (I don't know if it is true, but that's what I've read). From this reading, I've had the idea to change the sensitivity manually. I've thought about using low gain antennas already, but as R...

jpjust

Hello, folks. Is there any way to change the receive sensitivity via software? Let's suppose I have an AP running ROS and all of its clients are connected at -70 dBm or higher. So, I'd like to set the receiver sensitivity to, let's say, -75 dBm, so, lower signals from other radios couldn't interfere...

jpjust

I've heard the same noise in EMP-8602 and R52. I think it's normal

jpjust

Until now is OK. They are connected to a R52.

We've got an increase in performance, but I'm not sure if it's related to RTS/CTS or card change, because we were using R52H before and changed to R52 the same time we've started to test RTS :p

jpjust

I enabled it on the ap also.

I think you don't need RTS in AP, as every client will sense the channel.

This week I'm testing RTS/CTS in my clients. They use Ovislink, Edimax or Zinwell radios. I'm setting RTS Threshold on these radios to 500 to test.

jpjust

You've enabled RTS on clients only or on AP also?

jpjust

I've enabled RTS/CTS in a NanoStation5 which connects to a RB333+EnGenius 8602 as AP, but didn't work. But, I've also enabled RTS/CTS in some Edimax and OvisLink 2,4 GHz radios which connect to a RB333+R52H and it worked fine. Does RTS/CTS answers has anything to do with the wireless card we use in ...

jpjust

I think the point is enabling RTS/CTS on client side. Why? Because when the AP sends a frame, everybody listen to it and wait (CSMA/CA). But when a client wants to send a frame, it needs to RTS first, so the AP can CTS everybody and everybody will wait. I'm talking about the hidden node problem, whi...

jpjust

The mad reason to turn off ROS RTS/CTS responses is to disable RTS/CTS at all in a network and test the effects. As a computer scientist, I enjoy doing such things. :) It helps me to learn more. Of course, in a real application, I'd let RTS/CTS working as normal. But, anyway, I think disabling RTS/C...

jpjust

I've got another question now: is it possible (or, will it be possible via wireless-test) to disable RTS responses totally? I mean, even if a client sends a RTS frame, ROS won't answer with CTS (I know this might sound crazy :p)

jpjust

That's what I wanted to know. Thanks!

jpjust

OK, it's like this: Previously RouterOS AP always replied with CTS to those who asked RTS, but RouterOS client never asked for RTS. Ie. the support was not in the client. Then we introduced NStreme polling to solve the hidden node problem. Right now, in the Wireless Test package, we have also inclu...

jpjust

No RTS/CTS in the past and polling was only used when Nstream was enabled.

So, the default behaviour of ROS is to not use RTS/CTS?

jpjust

Does have MikroTik staff already started developing something on 802.11n standard? Any idea when it will be available to the public?

jpjust

Hello, folks. Since I've started using MK, I've noticed that WinBox doesn't show RTS/CTS options just like ordinary APs like Zinwell, Ovislink, Edimax, etc. Well, I've never used these settings in those other APs, but I'm curious to know why ROS doesn't let us change them. It's some kind of automati...

jpjust

Hello folks. Two of my 2.4 GHz POPs are under heavy interference, so, I did a Freq. Usage to try to select the best channel. In one of them, I've found a channel with -97 dBm noise level, but some 802.11 usage. So, as recommended by another member, I choosed this channel, because the others were und...

jpjust

I haven't had much luck with API in Client/AP mode. It adds latency and doesn't seem to work that well, makes thing worse if anything. Tried with XR9, SR2, R52, SR9 etc. I would not recommend using it, but in some cases it may work, but normally, I would not use it. I didn't had problems with ANI h...

jpjust

Client mode: means that Noise Immunity will be activated only when the radio is in client mode (station).
AP and Cliente mode: means that Noise Immunity will be activated in both modes (station and bridge/ap bridge).

Did you get good results with Adaptive Noise Immunity turned on?

jpjust

Thank you for the fast reply :) this will be shown for most atheros cards, because the driver is the same. check card specifications to find out what you have. So I did. R52H.pdf (downloaded from routerboard.com) says "Chipset: Atheros AR5414". EMP's datasheet doesn't say anything about it...

jpjust

Hello, folks.

Do R52H and EMP-8602 Plus support Adaptive Noise Immunity? I'm asking this because ROS' doc says that it is supported only in AR6001X and newer chipsets and WinBox shows AR5414 for both cards, but the ANI option is available via WinBox.

jpjust

The first two cards were probably a waste of your time and money. The R52H is good, the XR2 is best. Yeah, I already realized that :) My goal is to change everything to XR2 in the future. That's half of what I mean by "right parts." Also, make sure you use good antennas which fit your app...

jpjust

That was I always thought, but I need to be sure :) My problem is that my city is full of pirate WISPs (WISPs that don't have a license to operate). They always use the card's maximum output power, so, noise here is critical! In the US and Canada, a WISP doesn't need a license so there are a lot mo...

jpjust

Thanks for the clarification.

That was I always thought, but I need to be sure

My problem is that my city is full of pirate WISPs (WISPs that don't have a license to operate). They always use the card's maximum output power, so, noise here is critical!

jpjust

RG3.Net - http://www.rg3.net

Feira de Santana, BA, Brazil. We use MikroTik with RouterBOARDs in every ERB. Only our point-to-point solutions still using old Terabeams, but we are going to replace it with RBs soon. A little bit more than 500 customers in our network.

jpjust

Hello, folks.

When I use the frequency usage monitor on a wireless card, it shows me two pieces of information: usage (how many networks are using that channel) and noise floor.

So, my doubt is: what's the best choice? Less network usage or less noise floor?

TIA

Search found 39 matches

Re: RB450 as a PPPoE server

RB450 as a PPPoE server

Re: ROS 3.23 STABLE - TG - PtMP G working fot the 1st time ever

RTS/CTS in 802.11b mode

A question about cts-to-self

Re: Another medium access instead of CSMA/CA

Another medium access instead of CSMA/CA

Re: RF cable length

RF cable length

Re: Why not increase DFS scan time?

Re: how select frequency ?

Re: Why not increase DFS scan time?

Re: Why not increase DFS scan time?

Why not increase DFS scan time?

Re: Changing receive sensitivity via software

Changing receive sensitivity via software

Re: R5H mini pci wireless card noisy ...

Re: 411 client won't connect with rts/cts turned on.

Re: 411 client won't connect with rts/cts turned on.

Re: 411 client won't connect with rts/cts turned on.

Re: RTS/CTS options in ROS

Re: RTS/CTS options in ROS

Re: Confused about rts/cts

Re: Confused about rts/cts

Re: Confused about rts/cts

Re: Confused about rts/cts

Re: Confused about rts/cts

Re: Mikrotik Boards supports 802.11n????

RTS/CTS options in ROS

Strange behavior under interference

Re: Adaptive noise immunity - Client/AP and client mode

Re: Adaptive noise immunity - Client/AP and client mode

Re: Adaptive Noise Immunity support

Adaptive Noise Immunity support

Re: Frequency usage vs noise floor

Re: Frequency usage vs noise floor

Re: Frequency usage vs noise floor

Re: Mikrotik WISPs: Where?

Frequency usage vs noise floor