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Wireless Networks Thread, ruckus wireless bandwidth issues in Technical; Hi Rushed off my feet for the last few days (my techie is on holiday) so have not had chance ...
  1. #46

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    Hi

    Rushed off my feet for the last few days (my techie is on holiday) so have not had chance to unplug it yet, but I will try. I am having to take half term to use up my holiday so I will do this in a week and post back to you.

    Can I pick your brains further? I used my fluke tester to check which ports two PC's were connected to on the Core switch and one has a Low reading and the other has a Normal reading. They are physically sat next to each other and are less than 30 metres from the core switch as measured on the tester. If I get a low signal on the tester is this something I should worry about? I have noticed this on lots of things but the fluke manual is virtually useless and just shows it as low signal or normal signal. Can you advise please?

    Mark

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    The Low Signal net tool reading is indicative of a voltage issue on the corresponding pair of wires.
    If the equipment being measured is identical eg. NIC, cable and run length then It's worth investigating further.

    Swap transmission lines between the pc's being tested and test inline at both ends of the link.
    This should help you identify if you have a NIC, switch port or cabling issue.

    A LOW signal can result in excessive re-transmissions on a link, but you should use the switches GUI to inspect the stats for the corresponding Switch ports before concluding that the LOW signal recorded by the Fluke is in fact a problem.

    You should use simple ping -t tests on both PC's to check for packet loss.

    Whilst the High-Low test of the nettool is a useful indicator of simple faults it's no substitute for TDR testing.
    You only need one tiny section of cable to have been knotted during installation to have such effects.

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    Hi

    I have a Ruckas Zone Director 1000 and 30 AP's all 10/100. Our switches are nearly all 10/100 with 1Gb fibre between buildings. Despite being promised 50 clients able to login to the Ruckas AP we never get more than 13 connected before login slows down. They are all HP laptops and the kids are all googling the net. I have spent months trying to stop the entire system crashing and have taken the advide of the wireless company who blame our wired network. Having spent money on consultants I realise I really need to upgrade the switches. My best find was Procurve Manager 3.0 (60 day trial at the mo) which shows me realtime and logs utilisation on the ports. I have made some changes as a result and the wireless has been more stable - time will tell.

    What I want to know is - is it a good idea to upgrade my AP's to 1Gb N capable - ours are not I think they were installed about the time we thought about going N?

    I feel let down by the supplier who said we could get 50 clients on each AP. In reality if we get 15 we are lucky. If you do the maths thought they will only get about 0.5mb/s so it is hardly surprising. Who ever has a wireless client that just saves and opens files from a server. Lets face it the teachers want the kids to use the internet as the main reason for using the laptops.

    I have seriously thought about ripping Ruckas out and installing Aruba but money is not easy to come by any more. To be fair the system was brilliant for the first year when all clients were XP. Things have got worse since Vista and now with Windows 7 and a Server 2008 r2 functional domain level we have had these problems.

  4. #49

    localzuk's Avatar
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    Sounds to me like your wired network is at fault, not the wireless networking gear I'm afraid. You are funnelling a lot of connections through 100Mbit links, meaning very poor end user connection speeds.

    What AP's do you have (the model number)?

    You should really have your AP's plugged in to 1Gbit ports you see. It would mean, on the same AP's you would end up being able to handle about 130 clients where you're getting 13 at the moment!

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    Thanks for your comment. Surely my AP's would have to be 1Gb as well in order to get more connected? I appreciate I need to put them into 1 Gb ports - I just don't have any spare. All right I have a couple so will test it on those. I basically need to replace all my switches with 1 Gb ones. Anyone recommend a particular HP switch that is layer 2, can telnet and web manage and have CLI. Must have 1Gb firbe ports (2 normally).

    My Ruckas AP's are ZF2942 running software version 8.2.2.0.7

    Mark

  6. #51

    localzuk's Avatar
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    Ah, those AP's don't have gigabit ports - I think you were sold the wrong AP's by your reseller there. You'll be able to have 50+ users on the net at the same time just fine, but you'd never get 50 users on one AP doing network activity (ie. domain logon/log off, opening files etc...) as that has higher demands of the network.

    Think of it this way - if you have 50 users on that device logging in at the same time, they're going to get a maximum of 2Mbps - which is ridiculously low (and you wouldn't actually be getting 2Mbps, as some is used for overhead etc...).

    When did you have this system installed?

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    Because this is a public forum I do not want to name and shame the company that installed them. To be fair to them 10/100 was the norm nearly three years ago when it was installed. It will be three years this summer holiday. That's why I posted because I wanted to see if it was worth buing newer AP's. Would you recommend replacing the Zone Director with a newer one or would this be OK just with any firware upgrades?

    Thanks for your help

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    localzuk's Avatar
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    Quote Originally Posted by mtdant View Post
    Because this is a public forum I do not want to name and shame the company that installed them. To be fair to them 10/100 was the norm nearly three years ago when it was installed. It will be three years this summer holiday. That's why I posted because I wanted to see if it was worth buing newer AP's. Would you recommend replacing the Zone Director with a newer one or would this be OK just with any firware upgrades?

    Thanks for your help
    The ZD should be fine with firmware upgrades I'd say - but speaking to a Ruckus specialist such as Net-Ctrl would be better to advise.

    I'd be looking at installing ZF7300 series AP's now, they are a/b/g/n dual radio antennas with gigabit ethernet and can handle a good number of users.

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    Can you give me a weba ddress for this company please or shall I find it by Googling it (other search engines are available!)

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    localzuk's Avatar
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    Quote Originally Posted by mtdant View Post
    Can you give me a weba ddress for this company please or shall I find it by Googling it (other search engines are available!)
    They're a sponsor on here. Try sending a PM to Aggy - View Profile: Aggy - EduGeek.net

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    with 802.11abg networks the advertised speed of 54Mbps includes all the overheads associated with WiFi, such as beacons and acknowlegements. You'll be lucky to see data throughput rates of 20Mbps (you can test this out with a tool like iperf). Now the majority of enterprise APs should be dual band so they can run 802.11g and 802.11a clients concurrently. For light web browsing I would expect an enterprise AP to be able to cope with 50 clients providing those clients can be split between the two radio chipsets (maths = 802.11g @20Mbps + 802.11a @20Mbps/50 clients = 800Kbps each).

    In order to improve wireless performance ensure that all the APs in the same physical locations are using different non -overlapping channels (this means 1,6 or 11 on 802.11g) you can check whats happening around you using InSSIDer.
    Broadcast packets on your wired network will be forwarded into the air by your APs and by default broadcast packets are sent at 2Mbps eating up loads of aitime, so you want to VLAN your wireless network off to stop broadcasts effecting the wireless network.
    Does Ruckus have a client load balancing feature? Make sure that's switched on.

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    Ruckus is a managed wireless system, so channels are automatically chosen by the controller. It actively monitors for overlaps and interference and switches automatically should anything change.

    The issue won't be the web browsing, it will be the network activity - logging on/logging off, and any heavy activities like streaming video etc... that cause issues.

  13. Thanks to localzuk from:

    mtdant (8th March 2011)

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    Hi Thanks for your input.

    I did play with VLAN ing the Ruckas but managed to crash every AP in the school and had to reset them with a paperclip to fix it. I think I will try this again in the summer hols. The Ruckas is a bit complicated because every VLAN port has to be tagged and I still haven't got my head round setting this up yet. I have thought for a long time that multicasts on my network were killing the wireless and was considering VLANing the wireless. For now I will VLAN my server farm which uses multicast because this seems a lot easier and less prone to fail.

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    Our teachers do expect to stream video so maybe this is the cause of the problem or at least is a heavy contributor.

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    localzuk's Avatar
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    Quote Originally Posted by mtdant View Post
    Hi Thanks for your input.

    I did play with VLAN ing the Ruckas but managed to crash every AP in the school and had to reset them with a paperclip to fix it. I think I will try this again in the summer hols. The Ruckas is a bit complicated because every VLAN port has to be tagged and I still haven't got my head round setting this up yet. I have thought for a long time that multicasts on my network were killing the wireless and was considering VLANing the wireless. For now I will VLAN my server farm which uses multicast because this seems a lot easier and less prone to fail.
    You can't simply pick and choose what to 'vlan'. You have to segment your entire network - so if you intend for your wireless to be separate to your servers, you need to have them in their own VLAN, and the servers in their own too.

    You then need to set trunk ports on all switches to carry all vlans (ie. have every vlan 'tagged' on those ports), and set the individual ports used by the devices (eg. ap's, servers etc...) untagged on the specific vlan that you wish to use.

    You also need to have some form of routing device to handle the 'cross-vlan' traffic - so either a specific router, or a layer 3 switch capable of doing the job (HP 5406zl does this for me).

    Quote Originally Posted by mtdant View Post
    Our teachers do expect to stream video so maybe this is the cause of the problem or at least is a heavy contributor.
    Video can demand anything from a few hundred kbps up to a couple of mbps depending on quality - so its very easy to see it eating bandwidth.

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