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Wireless Networks Thread, Sanako Study 100 flooding network in Technical; When sharing a teachers screen using sanako study 100 fragmented UDP and IP packets are sent out from port 2211 ...
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    ranj's Avatar
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    Sanako Study 100 flooding network

    When sharing a teachers screen using sanako study 100 fragmented UDP and IP packets are sent out from port 2211 to port 6112.

    No. Time Source Destination Protocol Info
    16130 51.649159 - 10.122.85.129 - 239.1.85.129 UDP Source port: 2211 Destination port: 6112

    As you can see the source IP is correct and the destination IP is not. And the same happens with IP :-

    No. Time Source Destination Protocol Info
    16132 51.649722 - 10.122.85.129 - 239.1.85.129 IP Fragmented IP protocol (proto=UDP 0x11, off=1480)

    These occur constantly untill screen sharing is disabled and floods the whole network. do other people who use sanako software also have this problem. We thought it may be one of our switches in our room, but we tryed it in other it rooms and its the same problem

    Any help would be great

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    Geoff's Avatar
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    Re: Sanako Study 100 flooding network

    Looks like Multicast to me. Does your network infrastructure support multicast?

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    Re: Sanako Study 100 flooding network

    Quote Originally Posted by Geoff
    Looks like Multicast to me. Does your network infrastructure support multicast?
    As far as I am aware yes, but I dont see how multicast can cause the DoS on the rest of the network other than the software being pants and not adressing properly.

    Considering we run 7 rooms with sanako wich could all be sharing the screen via multicast all at the same time this is a huge amount of traffic.

    Short of seperating each classroom onto a new subnet what options do we have?

    Thanks

    Chris

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    Re: Sanako Study 100 flooding network

    As far as I am aware yes, but I dont see how multicast can cause the DoS on the rest of the network other than the software being pants and not adressing properly.
    Do you have 3com switches? I've seen them die due to multicast traffic. Although a firmware upgrade fixed them.

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    CHR1S's Avatar
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    Re: Sanako Study 100 flooding network

    Thanks for the quick reply Geoff,
    All ours are Netgear FS526T's with the odd old hub playing non essential out of the way roles.

    All the rooms that are effected run directly through a Netgear.

    Thanks

    Chris

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    Re: Sanako Study 100 flooding network

    So are they running the latest firmware?

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    Re: Sanako Study 100 flooding network

    Sorry forgot to say yes they are.

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    Re: Sanako Study 100 flooding network

    Do the switches allow you to setup multicast scopes?

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    Re: Sanako Study 100 flooding network

    no they dont.

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    Re: Sanako Study 100 flooding network

    Is there anything in the swtich config related to multicast?

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    Re: Sanako Study 100 flooding network

    You could try Paul Redhead at Sanako.

    Beech House
    Bradford Road
    BRADFORD
    BD19 6BW

    Tel: (01274) 863380
    Fax: (01274) 863381
    paul.redhead@sanako.com
    Company Web Pages: www.sanako.com

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    Re: Sanako Study 100 flooding network

    Thanks for all your help with this!

    I have come to the conclustion that our switches dont support any multicast features. The multicast traffic will just have to be accepted at present untill we restructure our backbone.


    Thanks

    Chris

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