Instability of network with multiple AP's (X2000, WRT54G)

I have a network consisting of ADSL modem, connected to an old Linksys wired router, which is acting as a firewall and DHCP server. Then I have connected two Linksys X2000's acting as wireless AP's via wired connection to the old router, and one WRT54G (not sure about the exact model number, as I'm currently off-site). The X2000's are connected to the LAN via Ethernet port 1.
Here is the topology:
ADSL modem
|
Linksys DSL/Cable router
| |
X2000 X2000
|
WRT54G
I have enabled DHCP server on the Linksys DSL/Cable router, and disabled it on the AP's. The SSID is same on all three AP's. The Channels are set on 1, 6 and 11, and they are on Auto (mixed) mode. The network security is currently disabled.
Now, the network is unstable, and I am not able to properly diagnose the problem. When I have only one of the X2000's turned on, it appears to work fine. When I turn on the second, it also appears to work fine. When I connect on through wireless, the ping response is good, and while walking towards the periphery of the first AP, towards the range of second, no ping response stops, but the laptop switches to the 2nd AP. After that, I am not able to get any ping response no matter whether external or internal IP, except for the IP of the AP where I am currently connected to. Sometimes I may be able to ping also the main router, and the other AP's. If I restart the AP, I am again able to connect to internet, and also to ping internal IP's, and all seems to work fine, but after some time I am getting complaints from users that clients are not able to connect to internet.
I have tried to review my X2000 configuration carefully, but I just can't seem to realize what I am doing wrong.
Could you please point me to the right direction?
Thanks

Nah, it did not resolve the issue.
The X2000's are acting really in a weird way. I just don't get it what is going wrong. If I have only one X2000 in the network, everything seems to work fine, but as soon as I connect the 2nd one, the problems start.
I tried using the DHCP Relay as you suggested, but also that did not work.
In the following thread there was a comment that X2000 is not capable sharing the connection via LAN port, which sounds very strange to me. Do I really have to buy new hardware to solve this?
http://community.linksys.com/t5/Wireless-Routers/Using-routers-as-wireless-access-point/td-p/481728
I would like to get more step-by-step troubleshooting suggestions, to check the router routing tables and DNS configuation.
Here is my current routing table when connected to X2000 via wireless - and everything works correctly for now, on my laptop. But the 2nd X2000 segment in not working. To me it seems they disable each other, and I can't figure out what goes wrong and where.
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.0.1 0.0.0.0 UG 0 0 0 wlan0
link-local * 255.255.0.0 U 1000 0 0 wlan0
192.168.0.0 * 255.255.255.0 U 9 0 0 wlan0
And here is the current routing table of the main building X2000, :
Destination LAN IP Subnet Mask Gateway Hop Count Interface
192.168.0.3 255.255.255.0 0.0.0.0 1 LAN & Wireless
0.0.0.0 0.0.0.0 0.0.0.0 1 Internet (WAN)
Here is the routing table of the main router/gateway (BEFSX41 v1, Firmware Version:: 1.52.16)SjkjkX4BEFSX411BEFSX41
Routing Table Entry List
Destination LAN IP Subnet Mask Default Gateway Hop Count Interface
0.0.0.0 0.0.0.0 2.105.253.1 1 WAN
2.105.253.0 255.255.255.0 0.0.0.0 1 WAN
192.168.0.0 255.255.255.0 0.0.0.0 1 LAN

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Hello -
I have been having trouble combining all of my airport devices into one single network. I currently have one Airport Extreme (Gen 2) and two Airport Express (802.11n) devices to cover my home. I have significant difficulty with range on the devices. Right now each of the devices are connected separately via anethernet cable to a switch that then is connected to my home FIOS router. All of my best efforts at bridging the devices with my Extreme as the primary network have failed. Is it possible to have each of the Airport devices act as one network with this configuration?
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I really hope someone can help me with this one because it's giving me all sorts of headaches.
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I really hope someone can help me with this one because it's giving me all sorts of headaches.
I manage all the IT for a large elementary school. We have Macs all over the building. (unfortunately many are still OS 9 Macs) As we replace and add new machines we have some that are wired in the network and some that are wireless. This is creating a rather messy issue with ARD. The backend of our network is running Cisco hardware. Our networking department has split our wired and wireless network on to separate VLANs. If I connect wirelessly to the network from my laptop, I can see the wireless Macs. If I connect through a wired connection I can see the wired machines. If I have both turned on, I tend to get problems with ARD freezing up when it tries to scan the local network. If I scan the wired network and switch to a wireless connection, everything works until the DHCP lease expires on the machines overnight and they get new IP addresses. I'm pretty sure this has to do with Bonjour and mDNS.
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Instability of network with multiple AP's (X2000, WRT54G)

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