Inability to See Network Computers with PPPoE

I am using a MacBook, connected to a Linksys WRT150N wireless router. I am also using PPPoE to connect to the internet; the PPPoE settings are in the router, not in the computer.
I would like to connect to computers in my LAN, but am not able to when PPPoE is turned on. (N.B. - I have this problem whether or not I connect to the network via the router or directly.) Turning PPPoE every time I want to connect to other computers in my network is obviously not an option. Are there any thoughts on my problem?
(It is also important to note that I had the same problem with my iBook, running Tiger.)

In both cases (cable directly attached or with a router), you have a firewall enabled between you and external network.
I'm pretty sure that you also have DHCP going because if you didn't, you would be getting an 'auto-ip' address (something starting with 169). I suspect you're currently getting something like 192.168.1.x? DHCP doesn't cross router boundaries (unless configured - and a personal router wouldn't be configured to do that).
If you want to make this work and keep your router in the mix, I suspect at the minimum you'll need to configure the router to consider your machine on the 'DMZ'. There should be a menu in there someplace that does this.
When you setup an internal host as 'DMZ' on these routers, you're basically just thrown out on the external side of the router. So be sure to protect your system with a local firewall.
As for when you're directly on the wire without the router, I'm not 100% certain how OS X handles its routing on PPPoE. Remember, with PPPoE, you're building a tunnel over a foreign network to a specific location, and then sending all traffic over the tunnel. The traffic wouldn't be able to break out of that tunnel to go to other network hosts by itself, so the OS would have to do what's called a 'split tunnel' and allow some traffic to stay out of the tunnel (the traffic that isn't working for you) while the rest travels in the tunnel (to the Internet).
Hopefully with this information, you can re-arrange/re-configure things to get you going. Just be aware of your host security in doing this.
Oh - and I'm heading out to work. Just a courtesy so you're not waiting for another reply this morning.
Message was edited by: mreckhof

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The recommented network setup is to make the router connected to the broadband connection be the ONLY router in the home and configure all other routers so they are in "Bridge" mode. That is to say, the other routers are configured so they just extend the primary router's subnet.
How a home router is put into bridge mode is different depending on the make and model of router.
In your case, I think the Belkin should be the primary router, and you should put the Time Capsule into "Bridge" mode. Applications -> Utilities -> Airport Utility -> Time Capsule -> Internet -> Connection Sharing: Off (Bridge Mode).
Once you put the Time Capsule in bridge mode, all your systems should be on the same Belkin subnet, and now Bonjour will see all the Macs in your home.

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Should I be able to click on Network in Finder and see networked PCs on my LAN? I can share and transfer files from a laptop to this iMac, but I don't have the laptop with me right now. I'm trying to see a different desktop PC right now. Under Network, then Servers, I only see iMac.local.
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Message was edited by: FeatherM

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Yes you should see them if they are Sharing and on the same Subnet.
If you know the IP of the other Laptop, try In finder, select Go menu>Connect to Servers..., then on the iMac, type in smb://ip.of.the.pc, like...
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Message was edited by: Robbie1702
Message was edited by: Robbie1702

Hi Robbie, and a warm welcome to the forums!
Have you done any Maintenance since installing?
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Safe Boot , (holding Shift key down at bootup), use Disk Utility from there to Repair Permissions, move these files to the Desktop.
/Library/Preferences/SystemConfiguration/preferences.plist
/Users/YourUserName/Library/Preferences/com.apple.systempreferences.plist
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist
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$xxxxxxxxx
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Inability to See Network Computers with PPPoE

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