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by OndrejSkipala
Mon Oct 15, 2012 7:48 pm
Forum: Wireless Networking
Topic: R52n-M, WLM200NX - Works only with NV2 problem
Replies: 4
Views: 1453

R52n-M, WLM200NX - Works only with NV2 problem

Hi, we came to a weird problem while testing 4 radio cards - a pair of R52n-M and a pair of Compex WLM200NX . We established a 100m test link with 24dBi MIMO antennas , got signals about -30dBm (lowered the TX power) on both sides, both chains. No interference at all - this is clear testing outdoor ...
by OndrejSkipala
Mon Jun 18, 2012 8:11 pm
Forum: Wireless Networking
Topic: R52Hn strange readings
Replies: 36
Views: 10215

Re: R52Hn strange readings

I just upgraded my NStreme Dual link and I'm having the very same problem. One way it is R52-R52 card and it works fine. The other way (upgraded) is now R52HN - R52HN card . At TX side I use 22dBi dual-polarity antenna, at RX side I use two antennas, 29dBi vertical pol. and 24dBi horizontal pol. The...
by OndrejSkipala
Wed May 23, 2012 6:32 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

A simple way is create a script which checks the throughput of link each x seconds and changes the HTB limit according to it . Wouldn't that write into flash everytime? I think the flash has limited write count. I wouldn't like to damage my boards in one month :-) But yes, that could be a way out. ...
by OndrejSkipala
Wed May 23, 2012 9:05 am
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

The proper saying is "lucky man" not lucky boy. I wouldnt say this is luck. If you switch to nstreme on wirelss don't you get up to 3ms latency per link without any aggregation ? Im' sorry... Lucky man :-) NStreme? Of course you get up to 3ms latency as well as on empty 802.11a. Problem starts when...
by OndrejSkipala
Tue May 22, 2012 4:24 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

I strive to achieve 0ms latency (less than 1 or 1ms) end-to-end in any network I operate. By using 1Gbps+ etc. Lucky boy, you use ethernet wired links. Set HTB limit under 100M or 1000M for gigabit and enjoy. We have to operate wireless links, which are much more trouble :-( 30ms through the networ...
by OndrejSkipala
Tue May 22, 2012 8:32 am
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

When a NIC has received packets (with or without interrupt moderation) it will interrupt the CPU to grab those packets and put them in memory and a task is added to the scheduler task queue to handle those packets at earliest convenience. So... when packet arrives at interface, it goes to the memor...
by OndrejSkipala
Mon May 21, 2012 6:39 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

sten, I'm very glad there is other person interested in real QoS on Mikrotik :-D Now we are 3 and still growing! :-) Your post about TICK rate is quite interesting. It can be like that, it would be logical. But if the tick rate is 150 ticks per second, that means it collects packets every 7 ms, the ...
by OndrejSkipala
Wed Dec 21, 2011 6:47 pm
Forum: RouterBOARD hardware
Topic: How do you ground shielded cable?
Replies: 18
Views: 9339

Re: How do you ground shielded cable?

By the way, if you use POE to connect outdoor device, isn't it already grounded by the minus pair of the cable(brown, using TIA/EIA-568-B standard)? So maybe there is no reason to use STP cables to ground the outdoor device?
by OndrejSkipala
Wed Dec 21, 2011 2:07 pm
Forum: RouterBOARD hardware
Topic: Problems with new revision of RB711-5Hn
Replies: 63
Views: 19989

Re: Problems with new revision of RB711-5Hn

Reporting the same problem. RB711-5Hn-M , unfortunatelly dont know the serial number now. After installation everything was fine, signals as expected, even though the TXsignal was a little bit unstable (-67dBm +-3dB), but I left it like this. The board is running 14 days now and I can see problems f...
by OndrejSkipala
Tue Nov 08, 2011 6:03 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

Look at my testbed scenarios. On the second and third you will have the 128ms delay (windows 7 interface 10/100) and 20ms if doing same test with ubuntu 11.04. This is my testbed. This was done without any queue on RB433UAH, the idea was just to discover where was the delay coming from. 1) In the f...
by OndrejSkipala
Tue Nov 08, 2011 5:40 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

Ah there is the problem - v4.x , If you have PCQ you must have at least v5.4 (or v5.8 - because of some crash fix in PCQ), before that PCQ was slow on high speed or high packet connections. Is 4Mbps using 1500B packets a high speed connection? I will try the behavior using v5.8, but I'm pretty sure...
by OndrejSkipala
Mon Nov 07, 2011 10:04 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

Why no?? Your example just perfectly illustrated what i'm saying - it all depends on queue type. Queue type is only thing that can delay a packet and change order, if you will put queue-size=0 (theoretically) for all queue types you will be able to see, that priority have no effect on order. I woul...
by OndrejSkipala
Mon Nov 07, 2011 9:55 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

This is not true, our HTB doesn't rearange packets according to priority, it discributes available amounts of traffic according to priority, this way deciding what packets will be dropped. So MacGaiver is right Maybe it's just about seeing it from different angle? Like "what is the HTB"? Like I say...
by OndrejSkipala
Mon Nov 07, 2011 2:23 pm
Forum: Scripting
Topic: API Snooper
Replies: 6
Views: 3200

Re: API Snooper

nope. it is problem with API. Thanks for noticing it.
Hope you fix it in v.5.9 :-)
by OndrejSkipala
Mon Nov 07, 2011 2:20 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

What is your CPU load when this happen? Hardware queue in this case is also known as interface driver and have little to do with RouterOS QoS. That is why you need to place your limits in QoS as close as possible to realistic amounts of traffic that you have available. (putting 200Mbps limit on 100...
by OndrejSkipala
Mon Nov 07, 2011 2:14 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

WMM if different from NV2 qos. While wmm is for accessing the media first (reducing the contention window), NV2 qos has specific queues, and priority will let you choose which data goes to each queue. High priority queue will be transmitted first. Yes, I agree. WMM is different. It does what you sa...
by OndrejSkipala
Mon Nov 07, 2011 1:57 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

Maybe because of queue types, but not because of the priority. Priority is just a option that indicates when to start dropping packets No.... 1) HTB itself does not drop any packet! 2) Packets can be dropped only in queue. (maybe there is a special case when packets are dropped if CPU cant handle i...
by OndrejSkipala
Mon Nov 07, 2011 10:59 am
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

I think you need to examine this: http://www.tiktube.com/index.php?video=mJeK3iHGhLKLIKImpnCsFrHvnlIomlpG= I dont see any new information in it... I think the main confusion will be resolved by this: (slide 28): "HTB priority doesn't rearrange packet sequence – it doesn't put some packets before ot...
by OndrejSkipala
Mon Nov 07, 2011 10:37 am
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

On the meanwhile I'm having very good results with NV2 qos. My topology is (bridge<->station bridge) with NV2, queue count=4 and qos= frame priority. The data is going inside vlans. Just one bridge filter rule to extract priority from vlan and set it to the right queue inside NV2. Well, when using ...
by OndrejSkipala
Fri Nov 04, 2011 3:57 pm
Forum: Scripting
Topic: API Snooper
Replies: 6
Views: 3200

API Snooper

Hi, I'm trying to get list of all wireless devices heared by an antenna (need MAC address + signal strength) using API. In Winbox I simply run Snooper and get them all. However when I use API (using C#), it only replies with !re and nothing more. Scan function works fine. Anybody trying to use Snoop...
by OndrejSkipala
Fri Nov 04, 2011 3:55 pm
Forum: Wireless Networking
Topic: API Snooper
Replies: 3
Views: 661

Re: API Snooper

wrong forum

viewforum.php?f=9
Ok, thank you, I will try my luck there. Thought Snooper is under wireless..... since it is used only in wireless.
by OndrejSkipala
Fri Nov 04, 2011 1:54 pm
Forum: Wireless Networking
Topic: API Snooper
Replies: 3
Views: 661

Re: API Snooper

Nobody uses API? :shock:
by OndrejSkipala
Fri Nov 04, 2011 1:44 pm
Forum: Wireless Networking
Topic: voltage difference??
Replies: 26
Views: 3617

Re: voltage difference??

And now the testing results. Tested 3.11.2011, using laboratory power supply. RB433 was powered via jack, it had one CM9 card using 5GHz band (By the way CM9 card is a really bad card - it does not regulate under 10dBm at all. If you set 2dbm output power, it still transmits 10dBm.... what a piece o...
by OndrejSkipala
Fri Nov 04, 2011 1:14 pm
Forum: Wireless Networking
Topic: voltage difference??
Replies: 26
Views: 3617

Re: voltage difference??

Just think for a minute why do most WISP's use a 24V power supply @ 1.6Amps (or 800mA) to supply AP's when if as you say "signal level is driven by programmable setting" and just use a 12volt at 800mA, the only way this going to answered is when someone puts a RF dummy load onto the radio card and ...
by OndrejSkipala
Wed Nov 02, 2011 4:14 pm
Forum: Wireless Networking
Topic: voltage difference??
Replies: 26
Views: 3617

Re: voltage difference??

is correct about using less power but also it should be noted less power for the radio card so instead of giving out say 25dbm is will be much less and lower signal level from your AP than running at 24volts. That is a nonsence. The output signal level is driven by programmable setting. Can you ret...
by OndrejSkipala
Mon Oct 24, 2011 11:54 am
Forum: Wireless Networking
Topic: voltage difference??
Replies: 26
Views: 3617

Re: voltage difference??

will 12v 7AH battery do the work? and for how long will that work?? I used 12V batteries with approx. 5m cables for measurements done in environment where was no electricity. One 12V 7.2Ah battery can power up RB433 with a R52 card approx. 10 hours without any problem (that was the time I spent in ...
by OndrejSkipala
Mon Oct 24, 2011 11:47 am
Forum: Wireless Networking
Topic: voltage difference??
Replies: 26
Views: 3617

Re: voltage difference??

We used a laboratory power supply with adjustable voltage output. As device we had RB433 with one R52 card. I dont remember the values, but I guess it was something like as few as 3W at 12V and 6W at 24V . The only problem with battery is that its voltage varies from 13.8V to as low as 9V. Mikrotik ...
by OndrejSkipala
Thu Oct 20, 2011 11:14 pm
Forum: Wireless Networking
Topic: API Snooper
Replies: 3
Views: 661

API Snooper

Hi, I'm trying to get list of all wireless devices heared by an antenna (need MAC address + signal strength) using API. In Winbox I simply run Snooper and get them all. However when I use API (using C#), it only replies with !re and nothing more. Scan function works fine. Anybody trying to use Snoop...
by OndrejSkipala
Thu Oct 20, 2011 9:53 pm
Forum: Wireless Networking
Topic: voltage difference??
Replies: 26
Views: 3617

Re: voltage difference??

If you have only 3m of cable, then there is no problem to use 12V. If you run your device from battery, then it is better to use 12V, because then Routerboard takes less power than if you use 24V. Dont know why, just measured this behaviour. If you need longer cable, then use CYKY cable (e.g. 1.5mm)...
by OndrejSkipala
Thu Oct 20, 2011 8:12 pm
Forum: General
Topic: No firmware after upgrade to v5.6
Replies: 5
Views: 1128

Re: No firmware after upgrade to v5.6

After /system routerboard upgrade There is current firmware 2.18, but after 1day is there again current firmware EMPTY and kernel failure ros 5.7 Is this fixed in 5.8? After /system/routerboard/upgrade the firmware was 2.18 on one device, but after second running the command, firmware is 2.38 now. ...
by OndrejSkipala
Mon Oct 10, 2011 10:17 am
Forum: General
Topic: No firmware after upgrade to v5.6
Replies: 5
Views: 1128

Re: No firmware after upgrade to v5.6

Don't want to solve it by just upgrading. I did than on one router and it upgraded to 2.29 and was fine again. Just wondering why that happened and if someone else has the same problem.
by OndrejSkipala
Sun Oct 09, 2011 9:53 pm
Forum: General
Topic: v5.6 released
Replies: 91
Views: 21102

Re: v5.6 released

IIRC the graphing issue is related to the NTP server package taking too long to sync the system clock, and when the graphs are updated the time gap causes it to clear them. If you don't need the NTP server capabilities, using the simple NTP client rather than the separate package is supposed to avo...
by OndrejSkipala
Sun Oct 09, 2011 9:48 pm
Forum: General
Topic: No firmware after upgrade to v5.6
Replies: 5
Views: 1128

No firmware after upgrade to v5.6

Hi, I upgraded to RouterOS v5.6 from v4.16 and on two RB433s I have saw this problem. When I look into /system/routerboard/print the value of current-firmware is empty . I would not notice this, but I had problems with these routers. Pings went higher and packet loss occured . This has nothing to do...
by OndrejSkipala
Sat Oct 08, 2011 1:01 pm
Forum: General
Topic: v5.6 released
Replies: 91
Views: 21102

Re: v5.6 released

Our experience: 1) v5.6 solved our problem with /ip/route/cache where cache-size was growing and growing until it reached the max limit and then the router stopped respondng to all IP traffic. This happened in versions 4.x 2) CPU load of all RB433s and RB600 went up instead of down. RB600 that was u...
by OndrejSkipala
Mon Sep 26, 2011 8:38 am
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

Still no change in RouterOS 5.6. Seems like wireless QoS is really not a point of interest? Just a single parameter would be nice to add: hardware-queue-size.
by OndrejSkipala
Mon Sep 26, 2011 8:36 am
Forum: General
Topic: 5.x routing cache bug (?) - dropped packets, lost network
Replies: 28
Views: 9827

Re: 5.x routing cache bug (?) - dropped packets, lost networ

Hi guys, I was trying to solve this problem with Mikrotik support for a hundred times and finally a fix was made. Version 5.6 of RouterOS really seems to work with route-cache. Now, it is not getting unreasonably big (it was growing and growing), so I dont need to restart my routers every 110 days l...
by OndrejSkipala
Fri May 13, 2011 5:19 pm
Forum: General
Topic: 5.x routing cache bug (?) - dropped packets, lost network
Replies: 28
Views: 9827

Re: 5.x routing cache bug (?) - dropped packets, lost networ

Hi, I have the same problem on RouterOS 4.x (lastly on 4.16). My RB433 stops responding to IP traffic, only MAC works (but sometimes not very well). No ping, no routing. When I reboot it, works fine again. This happenes after 112 or 113 days on all routers. Also one of my RB600 collapsed in this way...
by OndrejSkipala
Mon Apr 18, 2011 12:09 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

This is still bufferbloat. Yes, I agree. Lowering the size of the hardware TX queues is a solution for Ethernet interfaces. I think that the right solution is queue management where the bottleneck occurs - use of software queues with minimal hardware queue (1 packet would be the best). Queue sizes ...
by OndrejSkipala
Sun Apr 17, 2011 6:46 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

Well, after reading and listening to Jim Gettys , it actually is a kind of bufferbloat . However what Jim Gettys was talking about are unmanaged queues (FIFO) which are too big (unnecesarily). If you use HTB with one output queue as I did and the type of the queue will be FIFO, size let say 1000 pac...
by OndrejSkipala
Thu Apr 14, 2011 12:46 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Re: Interface HTB - hidden buffer

Allright, I've looked into this book: Cisco - routing and switching (http://www.ciscopress.com/bookstore/product.asp?isbn=1587201968) and I found a page where they say that devices use also a hardware queue, and the description fits exactly. It is FIFO and packets (data frames) from software queues ...
by OndrejSkipala
Fri Apr 01, 2011 10:56 am
Forum: Wireless Networking
Topic: WDS - Torch and PCQ problem
Replies: 0
Views: 414

WDS - Torch and PCQ problem

Hi, I have a WDS link (dynamic) and I run some traffic over it. When I try to torch interface wds , it shows all the traffic. But when I try to torch wlan1 interface (the real interface on AP), it does not show any traffic. In the Interface window in winbox, I can see, that the traffic is normally g...
by OndrejSkipala
Wed Mar 30, 2011 5:01 pm
Forum: Wireless Networking
Topic: Interface HTB - hidden buffer
Replies: 44
Views: 12734

Interface HTB - hidden buffer

Hi, I have made some large investigation around HTB and I found a weird thing that I would like to discuss here: The configuration is this: - I have RB433 with one miniPCI card (R52H), wireless interface set to ap-bridge and one client (RB711) connected to it. - I have two firewall mark rules: chain...
by OndrejSkipala
Thu May 20, 2010 3:41 am
Forum: Wireless Networking
Topic: Starting 11n ptmp
Replies: 8
Views: 2718

Re: Starting 11n ptmp

Hi, we have one site running 802.11n. We use it for a village (3-4km distance), base station is on a hill. We use antenna from UBNT (AirMAX MIMO, 16 dBi, 120°), RB600A, R52N card, both chains for RX and TX. NStreme off, HW retries 15, EIRP 27dBm. On client side we use UBNT NanoBridge M5 (AirMax MIMO...
by OndrejSkipala
Thu May 20, 2010 3:08 am
Forum: RouterBOARD hardware
Topic: Routerboard 433AH 3v1??? chipset problem IP175D!!!
Replies: 21
Views: 7387

Re: Routerboard 433AH 3v1??? chipset problem IP175D!!!

To kirshteins: I myself do not need such a large packets. But what about the connection to ether2 and ether3 via winbox using MAC? Is that a feature too?
by OndrejSkipala
Sat May 08, 2010 4:17 pm
Forum: RouterBOARD hardware
Topic: Routerboard 433AH 3v1??? chipset problem IP175D!!!
Replies: 21
Views: 7387

Re: Routerboard 433AH 3v1??? chipset problem IP175D!!!

I have the same problem. I have two RB433 and two RB433AH here on my table, all of them have IP175D chip. When I connect via winbox (MAC) to ether1, it works fine. But when I connect to ether2 or ether3, I'm not able to change anything in winbox. Windows IP/Addresses and Bridge/Ports does not show a...