Why does my iPhone not show up in iTunes on a mac that has a shared internet connection from another mac?

I have what I would consider a difficult question. I called Apple Care and after she spoke to a senior advisor,the representative ended up saying it wasn't possible.
Having said that, I'm sure this is not a difficult question for people with networking expertise.
Setup
So...I have a MacBook receiving a WiFi signal via AirPort.
In System Preferences, I have turned on Internet sharing (share airport over Ethernet).
I connected the Ethernet port on my MacBook to the Ethernet port on my MDD PowerMac G4.
At this point, I can successfully browse the web, perform software updates, and view other computers and iTunes libraries on my network from my G4.
Goal
However, in iTunes on my G4 I would like to use iTunes DJ.
Tried
So...I click on iTunes DJ.
I set the settings (button in bottom right) to allow guest remotes, etc.
I turned on iTunes Home Sharing (logged into the same account as by iPhone).
Problem
However, from the Remote app on my iPhone, I am unable to see the library on my G4.
Also, if I want to pair my iPhone Remote app with iTunes on my G4, I click add Library in the Remote app, but iTunes on the G4 never displays my iPhone in the left column (although I am able to see all other iTunes libraries being shared on the network).
Thus, I cannot connect to iTunes as a guest Remote, nor can I connect as paired remote.
I have successfully done both of these things with computers connected directly to my modem, as well as with computers connected via WiFi.
The problem is connecting devices to computers that get their internet connection though another computer via internet sharing.
Question
So my question is about Internet sharing itself. Is it not a fully featured ad-hoc network? Does it only provide browsing capabilities and the ability to browse networked computers, but NOT devices such as an iPhone? I don't see the difference; my iPhone is on the same network as the computers, so why is there no communication between it and computers that gain their Internet connection through another computer?
I really hope someone out there who is an expert in networking can help me out with this. Or if it truly is impossible, if someone could explain to me why that is the case, I would also appreciate it.
ps. I usually have my MacBook sharing its Internet connection through an old router that I am using as a switch because I share the connection with three other computers. And if it isn't obvious, the modem is downstairs, and the MacBook, old router being used as a switch, and other computers are upstairs where there is no Ethernet wired.
Thank you in advance for any help.

Phone not recognised in itunes
iPhone not recognised by iTunes on PC
iPhone not recognised by iTunes on Mac

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