Wi-Fi Connection Issue at Startup When NAS configured as Login Item

Hi!
I recently ran into internet connection issue during startup. I managed to find the culprit (it's the firewall) but I believe there should be more behind just blaming the firewall for it.
Before I go any further, it would be best if I try to explain the setup that I have. Also, note that I'm a newbie when it comes to terms like DHCP, IP address, IPv4, IPv6, etc. I think I may have an idea what they do, but I'm not quite sure whether that idea jibes with the real thing. Whatever. Anyways, here's the setup.
For the internet connection at my place, I use a Cisco wifi router and an Airport Extreme Base Station. The Cisco router has been set up to have its own wi-fi network, while the Airport Extreme Base Station is connected to the Cisco router using ethernet. I set up a separate wi-fi network for the Airport Extreme Base Station and almost all of my devices are connected using the Airport Extreme's wi-fi network.
I have 3 external hard drives connected to a USB hub, which in turn is connected to the Airport Extreme base station.
2 Macbooks. One is a white, late 2007 MacBook running Lion. The other is a MacBook Pro running Mountain Lion. I turned the firewall on for both Macbooks.
Initially, there was no problem connecting to the internet and also the 3 external hard drives from the Airport Extreme. I did the wireless connecting to the external hard drives manually after startup (open finder > navigate to airport extreme at the sidebar > click on the hard drives one by one until the eject icon and folders are shown). You can imagine how soon this got annoying for me (yeah, I shutdown my macbooks everytime I finish with them, it's a habit). So I put these external hard drives as a login item at startup (in the system preference setting for accounts) so that I won't have to do this everytime I start my macbooks.
This is where it got interesting.
For my MBPro, during startup the wi-fi icon at the menu bar will show that it was trying to connect and then the '!' symbol is shown. When I go to system preference > network, there was a message about self-assigned IP. I notice that it starts with 169, which is not the usual IP assigned to devices in my home network. This, however, usually did not last long. Soon enough the '!' symbol is gone and the wi-fi connection becomes normal with finder windows popping up showing folders for the external drives. It's a minor annoyance, waiting for the '!' symbol to go away (I think it got something to do with DHCP settings sent from the router and the self-assigned IP address, but again I'm not sure), but at least the MBPro can connect in the end.
For my white MB though, things didn't go well. The '!' remains in the wi-fi icon and there was no internet connection, no matter how long I waited. Even after removing the external drives from login items the problem persists during startup. If I remember correctly sometimes there is a pop-up saying that the computer could not connect to the airport extreme server (this also happens on the MBPro).
I initially tried resetting the wi-fi setup (removing the network from the list of known network in system preference > network, removing the wi-fi network password from keychain access) to no avail (in both macbooks). As mentioned above, I also tried to remove the network hard drives from login item but even after that the connection problem persisted in my white Macbook, while the MBPro initially showed the same symptom before finally managing to connect with the proper IP address.
Finally, after googling through forums some people suggested that turning off the firewall might work. I did so, and voila, it did remedy the situation. Both Macbooks manage to connect to the internet during startup without any fuss, and both even manage to connect to the network drives during startup (I put them in again as login items to see if it would cause further trouble).
So, the firewall was the culprit. But it only started acting up AFTER I put the network drives as login items.
Can anyone explain the cause of this?
Anyways, thanks for reading!

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Message was edited by: Pifman

Pifman wrote:
Thanks to both of you. I guess the search I ran wasn't good enough as I didn't find the discussion that you posted.
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Wi-Fi Connection Issue at Startup When NAS configured as Login Item

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