nanog mailing list archives
Re: Project Fi and the Great Firewall
From: Jean-Francois Mezei <jfmezei_nanog () vaxination ca>
Date: Sun, 15 Nov 2015 15:20:07 -0500
On 2015-11-14 23:59, Yucong Sun wrote:
This is what roaming data means, Your data packet is simply trunked to your original operator to process. So you will be having a US ip on the web.
Based on my understanding, the phone establishes a local IP aconnection with equipment associated with an antenna and gets an IP a from it. It then establishes a tunnel to the APN operated by your carrier and the tunnel gets the IP address that your apps see/use. The IP address your apps see/use is given by your home carrier and all packlets flow through your home carrier's APN before going to the internet and you use your home carrier's DNS. Where I am unclear is what happens when you move from tower to tower. Whether your local IP changes and the tunnel is transparently moved to the new local IP, of whether the local IP address moves with you and routing tables are changed. Some phones have "debug" modes that will show both the local (local antenna) and the public IP address (from APN) in use. As your traffic flows out of China, it passes through the "great wall of routers" as traffic between you and your carrier's APN, not between you and some banned site you are trying to access. They'd have to do DPI and possibly decrypt tunnel traffic to catch where you are trying to connect and block those.
Current thread:
- Re: Project Fi and the Great Firewall, (continued)
- Re: Project Fi and the Great Firewall Roland Dobbins (Nov 14)
- Re: Project Fi and the Great Firewall Jake Mertel (Nov 14)
- Re: Project Fi and the Great Firewall Jared Geiger (Nov 15)
- Re: Project Fi and the Great Firewall Carlos Alcantar (Nov 15)
- Re: Project Fi and the Great Firewall Yury Shefer (Nov 16)
- Re: Project Fi and the Great Firewall Mark Tinka (Nov 20)
- Re: Project Fi and the Great Firewall Jake Mertel (Nov 14)
- Re: Project Fi and the Great Firewall Roland Dobbins (Nov 14)
- Re: Project Fi and the Great Firewall Roland Dobbins (Nov 14)
- Re: Project Fi and the Great Firewall Yucong Sun (Nov 14)
- Re: Project Fi and the Great Firewall Jean-Francois Mezei (Nov 15)
- Re: Project Fi and the Great Firewall Mark Tinka (Nov 20)
- Re: Project Fi and the Great Firewall Todd Underwood (Nov 15)
- Re: Project Fi and the Great Firewall Christopher Morrow (Nov 15)