Wireless Network design puzzle

35 pts.
Tags:
3Com Wireless 7760 Access Point
Bridge pc
Bridges
Linux desktops
Network design
PtMP
PtP
Static IP
Windows Server
Wireless Access Points
Wireless networking
I've got 30 legacy devices with static IP's (running linux), they are all connected to two Windows XP servers (acting as backup to one another) through ethernet. Both servers send broadcasts on the network inviting the legacy devices to connect to whichever is available. I'm trying to change the whole topology to wireless and was thinking of installing a 3Com WL-524 Access Point to every one of the legacy devices and a higher grade 3Com Wireless 7760 Access Point to the Windows XP servers. Its like having slave AP(s) communicating with a master AP, but I dont want the slave AP(s) to communicate with each other. Now my query is will this work ? and what mode should i setup the AP(s) to ? Client / Bridge / PTP / or PTMP mode ? I also need the wireless devices to be transparent, thus preserving the static IP(s) currently set. No internet, no gateways, its just a closed point to multi points network. Any clues?

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This is an interesting approach. Seems a little complex if you’re just looking for basic connectivity. What’s your philosophy behind this?

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Place an access point at each server for redundency and put a bridge at each end point. That should preserve your IP schema. Look for devices that can be remotely managed.

Since you are looking for redundency, you may want to look at more business class equipment as it tends to have more configurability and support redundency feature sets.

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  • Ramigabriel
    I'll explain in more detail, I work as an IT manager in a casino and we have a system connecting all slot machines to servers using devices called PTU(s). PTU(s) main role is to read gaming data from the slot machines and relay this info through the network to 2 XP servers where the data is consolidated for reports. Each PTU has a static IP address and runs linux. Two redundant XP servers broadcast on the network (basically sending messages to all PTU(s) saying they are online and ready to recieve connections.) This is currently all working great on a wired network, but due to moving to a new location, I've found it extremely difficult to extend network cables to every slot machine thus came with the idea of changing the topolgy to wireless. ALL PTU(s) and servers work on a network ID of 192.168.1.x I need this to work in a way where the AP(s) are transparent to the PTU(s), another isue is that the IP addresses are fixed and cannot be changed. example... Server 1 : 192.168.1.201 Server 2 : 192.168.1.202 PTU 1: 192.168.1.1 PTU 2: 192.168.1.2 .... PTU 30: 192.168.1.30 PTU 1 must be able to send data to both Server 1 and 2 (and vice versa) PTU(s) dont communicate with one another and thus don't have to see each other at all (should save on bandwidth) PTU(s) can run happily on even a 1 MBit connection as the data sent is minimal. I've also attached an image of the final topology required... Any help greatly appreciated...Wireless Topolgy
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  • Ramigabriel
    Link to image... http://yfrog.com/5itopolgyj Rami
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  • petkoa
    Hi, Ramigabriel Why do you need an access point on each PTU? I looked at the topology scheme and it seems you need just a single access point, wireless cards (or even usb dongles) on each PTU, and they should be configured in infrastructure mode, so will not "chat" themselves... BR and good luck, Petko
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  • Ramigabriel
    Hi Petkoa, thanks for the response, my issue is the PTU(s) are mini linux computers in small boxes that only have a power connection and a 10 MBit ethernet port. No usb, and no way of adding wireless pci cards... Similar to gaming consoles that only have an ethernet port. Rami
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  • petkoa
    Hi Rami, What they are based on? Some VIA EPIA? If so, they have to have usb, though it obviously is not exposed on the box. If you can open one of these boxes, you might see do they really lack usb... Though, the complimentary question - can you manipulate the linux on the PTU? Even if they have usb's, but they are not exposed, all chances are that you have no software support neither for usb, nor for wifi...:o( So, if you can't add kernel modules/recompile monolithic kernel on the boxes, there is no sense in opening them. So, let's go back to access points... May be, again 1 access point with both servers wired to it and wireless routers at each PTU? I'm not sure (and can't test just now) would it be possible to use just their "internal side" - wifi and lan interfaces without any special configuration, or you'll have to use them as gates, connect PTU from the "external side" and configure transparency using the router firewall, but one of these two scenarios should work. Good luck, Petko
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  • Kevin Beaver
    Aha - the missing link! You may be forced to go the route of an AP at each host...Sounds really messy though. Have you contacted the manufacturer to see if they have any ideas or perhaps some USB or PC Card expansion slots?
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