How can I connect to a VPN via PPTP?

Hello,
I am a foreigner living in Taiyuan, the capital city of Shanxi Province, in China. I bought my macbook the summer of 2006. It still works perfectly except I cannot connect to the internet here at the university.
The internet here is split into two parts: local, and international. The ethernet connection allows me to access Chinese websites, but nothing else. It sounds counterintuitive but really, that's how it is. In order to get the rest of the world, all computers have to connect to a VPN via PPTP. Once this is established, viola, you have internet.
My problem is I cannot seem to connect to the VPN. I have used Internet Connect, I have created a VPN via PPTP, and put in all the right numbers...
the VPN IP is 202.207.128.115
the username is tyut
the password is tyut
But when I try to connect, it just says it can't. Nobody at the university has been helpful because they've never used a Mac before, and besides which, they aren't used to using a computer in English.
Can anyone help me? Or does anyone know how to get in touch with Apple Services in China (in English)?

Yeah, but that's not the problem here. I'm an English teacher at Taiyuan University of Technology (the irony does not escape me). The other teachers have PCs and can get full internet in their apartment. Since I have a mac, it's much harder for the school technicians to help me.
This is what my log says from the VPN connection (which does connect now.)
Mon Oct 29 16:05:52 2007 : PPTP connecting to server '202.207.128.115' (202.207.128.115)...
Mon Oct 29 16:05:52 2007 : PPTP connection established.
Mon Oct 29 16:05:52 2007 : Using interface ppp0
Mon Oct 29 16:05:52 2007 : Connect: ppp0 <--> socket[34:17]
Mon Oct 29 16:05:52 2007 : local IP address 172.30.1.252
Mon Oct 29 16:05:52 2007 : remote IP address 172.30.1.2
But I still can't load any pages from the VPN connection, just the regular ethernet connection (local internet). It doesn't work if I use IP addresses instead. :-/ I unselected "send all traffic over the VPN connection" because if it's selected, I don't even get local internet.
Looking online I found a possible fix, but it's for Windows XP. I don't know how to find the same settings on the Mac...For Windows XP:
1. Click Start -> Control Panel
2. Click on the Network and Internet Connections icon and then click "Network Connections". If your Control Panel is in classic view, simply double click the "Network Connections" icon.
3. Right click on the new VPN connection and select Properties
4. Select the "Networking" tab
5. Verify that Internet Protocol (TCP/IP) is highlighted
6. Click on the Properties button
7. Within the Internet Protocol (TCP/IP) properties window, click on the "Advanced..." button. Within the Advanced TCP/IP Settings window, REMOVE the check mark next to "Use default gateway on remote network"
8. Click "OK" to close all open windows
Where would the "default gateway on remote network" be on a Mac?

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