Airport connects, but still no internet activity...

Heya. This is my first post so be gentle with me.
I've recently had an issue with my Powerbook G4 12
inch where I could connect to an open wireless
network (no WEP password) and my internet would
function fine, until the past three days when Airport
says it's connected but I can't browse the internet,
use BitTorrent etc.
Now when I open Firefox, it doesn't go immediately to
a "page cannot be displayed" dialog, it just keeps
looking for the page for a few minutes. Also, when I
run network diagnostics, everything is green until
"internet".
I don't have access to the modem or router base
station.
Anyone have any ideas?
I just posted my own experience in the forum "internet, networking and Power Mac G4" which is the same as the one of nofryzone. In that discussion, I think Lawrence Kahan has the answer to our problem. I will still have to try his proposed solution because it will entail changing the firmware of the linksys wrt54g router. In order to connect, I asked the help of [email protected] and they made me configure my airport connection manually placing the values that Lawrence Kahan wrote in his post. You will have to open system preferences and click on network. Configure Airport settings manually and enter the IP address 192.168.1.55, subnet mask 255.255.255.0, router 192.168.1.1. For the DNS server, you will have to get the value of DNS1 & DNS2 of your router and put them in the field for DNS server.
At least for now I am able to connect but through a static IP address and not through DHCP.
powerbook G4 12inch Mac OS X (10.4.7)

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I tried both of your suggestions and neither of them worked.
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If this is correct, the following would be the basic settings:
Either connect to the AEBS's wireless network or temporarily connect your computer directly (using an Ethernet cable) to the LAN port of the AEBS, and then, using the AirPort Utility in Manual Setup, check these settings:
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o Base Station Name: <whatever you wish or use the default>
o Base Station Password: <enter the desired administrator's password, the default is "public">
o Verify Password: <re-enter the desired password>
o Set time automatically: (optional)
o Allow configuration over Ethernet WAN port: (optional)
AirPort - Base Station - Base Station Options
o Contact: (optional)
o Location: (optional)
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o Wireless Mode: Create a wireless network
o AirPort Network Name: <whatever you wish or use the default>
o Radio Mode: 802.11b/g compatible
o Channel: Automatic
o Wireless Security: None
AirPort - Wireless - Wireless Options
o Multicast Rate: 2 Mbps
o Transmit Power: 100%
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o Use Interference Robustness: Not enabled
Internet - Internet Connection tab
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o Configure: Using DHCP
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o Domain Name: (optional)
o DHCP Client ID: (optional)
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o Connection Sharing: Share a public IP address
Internet - DHCP tab
o DHCP Range: <leave default or enter desired range>
o DHCP Beginning Address: <leave default or enter desired beginning address>
o DHCP Ending Address: <leave default or enter desired ending address>
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o DHCP Message: (optional)
o LDAP Server: (optional)
Internet - NAT tab
o Enable default host at: (unchecked)
o Enable NAT Port Mapping Protocol: (unchecked)
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Give me a screenshot of the working network IP setup on the MBP.
It should look like this. I need to see the IP address and you can also copy and paste for me the dns address.
The same thing from the iphone IP address and DNS will then help me figure out what is wrong.
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Airport connects, but still no internet activity...

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