Can't connect to ISP until ping ISP router address

I recently added a new MacBook (w/latest 10.5 updates) and had a lot of difficulty getting it to connect to our ISP through our AE. So much so that I reset our AE and re-entered all the information, creating a new network name and new network password. The AE is setup to share a specific ISP supplied IP address with a specific ISP provided router IP address and 2 specific ISP provided DNS IP addresses using DHCP and distributing a range of IP addresses for our 3 computers (2 airport connected MacBooks and 1 wired enet connected iMac). I also set it up to bind specific IP addresses to each computers MAC address using the airport MAC addresses for the MacBooks and enet MAC address for the iMac.
Now when I try to connect from the older MacBook or iMac (both of which are running 10.4.11) it may or may not work until I actually ping the ISP router address from a terminal app window. Once I've pinged the ISP router the connections seem to be okay for a while.
If I shut down the computer(s) and come back the next day I have to ping the router again before I can make a connection. I've not yet seen this problem with the new MacBook that's running the latest 10.5.
Any ideas why I need to ping the ISP router from the older (10.4.11) computers before connections can be made?
Have I missed some configuration step in the AE?

Thanks for your respond . I gave it a try and still didn't work . Here the thing I been messing around with the setting just to be sure I enter everything right I could of change a setting that I shouldn't of , now I'm not sure if everything is correct . Where is the guide or steps I can follow to be sure my setting are correct . I'm using cable connection . I know my pop and smtp are correct but I'm not sure as to whether the other areas are . I mean if this or that should be check .

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