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Problems with WAP54GP's

Discussion in 'Other Linksys Equipment' started by Rick_G, Mar 28, 2006.

  1. Rick_G

    Rick_G LI Guru Member


    I'm trying to install a wireless network that encompasses 2 buildings with 2 floors each. My plan was to put an access point on each floor of each building (total of 4) wired to a switch and then to a router to the internet.

    I called linksys sales and ask how I should do this. They sold me 1ea wrt54gr, 1ea srw224p and 4ea wap54gp's. I have had them configured in several ways but can only connect through the router. Sales says to give all AP's same SSID and leave in AP mode with same channel and router gateway IP.

    I'm new at this and have been told by technical support that what I have won't work how I want, but I think there's something missing in the translation. So can I configure this network with this hardware, or do I need to buy new stuff?? I wish I would have found this forum before I ordered.

    Thanks Rick
  2. Rick_G

    Rick_G LI Guru Member


    Not sure what I did different, but it's seems to be working now. I have router on channel 6 access points on channel 1,3,9,11. I can log on to them individually now and access the internet. There seems to be some trouble when I power them all up sitting on my desk, but 1,6,11 I can switch between them, 3,6,9 I can switch between them. Maybe when I get them installed with a little distance between they will be alright.

    EDIT: Switching back and forth between channels seems to make the router drop the internet. Only way to get the router connected again is to unplug all AP's and power cycle the router. Once router picks internet back up, plug AP in and they work. Anyone know what might be happening?

  3. RTSAnime

    RTSAnime Network Guru Member

    THe wireless channels do overlap. So keep them as far apart in the spectrum as possible. Also each AP should be on a different channel, although they should all have the same SSID and security settings. That should accomplish what you hope.
  4. Rick_G

    Rick_G LI Guru Member

    Thanks for the reply-

    Do you suppose the overlap is causing the router to drop the DSL modem? Kind of strange since they're connected with a cable, but I guess it could be just locking up?

  5. Rick_G

    Rick_G LI Guru Member


    I separated the 2 AP's in the first building, one upstairs hallway (ch#1) and one under neither the first floor "wood" (ch#11) The 12 rooms down stairs get ~40%-70%, upstairs about the same. I can see each of the AP's from the different floors at about 0%-30% signal strength.

    I can log on to both AP's and get the internet. The problem now is, when I log on to the downstairs AP (ch#11) ping all devices surf internet, everything fine. Turn off laptop go upstairs try and log on to ch#1, I get AP (ch#1) but can ping switch, router or internet. Do a power cycle on AP (ch#1) and back to being able to ping AP's, switch, router and internet. I go back downstairs log on to ch#11 and can only ping AP ch#11, power cycle AP ch#11 back to being able to ping everything again.

    I have a desktop hooked up wireless upstairs that I see Ch#1 with at 75% and no ch#11. I bring the laptop into the office after being hooked up to ch#11, while desktop is still connected to ch#1 and can't get hooked up, power cycle and both go on line. The cycle repeats.

    I am running static IP's on all equipment, desktop and laptop are auto IP. I can always ping AP's just can get to network unless I power cycle.

    Modem DHCP to router, router @ is DHCP server enabled .100-.149= 50 users. Switch static @ 192.168.254, AP ch#1 static @, AP ch#2 static @ Does it seems like it could be IP conflict?? Should I try router DHCP server, switch and AP @ DHCP??

    When I get to the switch on either AP it works good, just can't switch channels without power cycle of AP's. I turn laptop and desktop completely off and disable wireless LAN but still have to power cycle to connect to other channel.

    Due to the over whelming response to thread I thought I'd keep up guys updated.

  6. Toxic

    Toxic Administrator Staff Member

    what IP have you defined as your gateway?
  7. Rick_G

    Rick_G LI Guru Member


    Default gateway used at first and entered into the switch. Later we switched IP's on everything, tried DHCP on switch , entered DNS from modem in all devices.

    One of the other posters on the forum that's having the same problems summed it up like this, I don't think it was posted here, hopefully he won't mind.

    :eek: It looks like another new poster is having the same problem :eek:


    Well, the conclusion was that this is a limitation of WAP54GP. From Linksys support, nobody really cares with this problem. Their support is really bad. Even getting to the 2nd level support did not make any difference. Also, from the group discussion that was also no really interesting feedback.

    I will describe you my understanding of the problem and my workaround to it.
    Linksys does not support roaming or WDS. It is not even in their roadmap. The maximum they support is a 1 main + 3 repeaters.
    What I am trying to do is a little bit related with WDS because I am moving from one AP to the other.
    The problem is that each AP stores the mac address of the clients associated to it.
    This means that it builts a table of mac/interface.
    Each AP has 2 interfaces: wireless and physical.

    So, when you connect your laptop to AP1, the AP1 will store your mac related with the wireless interface.
    Now, while you are connected to AP1, AP2 is also learning and filing in this table. AP2, which is in the same segment, will put your laptop mac address into the table associated with the physical interface.
    Now, AP2 knows that your laptop is not in its wireless interface, but on the wire. AP2 thinks that you are connected to the wire as it does not know about the existence of AP1.

    When you move to AP2, disassociating from AP1 and associating with AP2, AP2 still has the entry in its table thinking that your mac address is in the wire. For this reason, it will not forward the traffic until this entry has aged!

    Workaround: Create one VLAN for each AP.
    I have implemented this solution with a VLAN for each AP and a network for each VLAN. Every time you change are, you have to press in the rescan button. The rescan will restart the 802.11 connection, get the strongest AP and get a new IP address.

    This is the only way that I have found it to work. If you find another, let me know!
    My customer just could not wait 15 minutes to get connectivity!

    My advice: Buy Cisco!! This linksys stuff is for home use only. I have tested this scenario with a 1200 series and works perfectly. Plus, it supports WDS with IAPP and another protocol fast roaming.

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