I can`t access OS X local web-server from guest windows when using 3g modem

[vahrammer]

Hello, sorry for my bad English.
The problem described in the title. I can do that when using wifi connection, but can`t with 3g modem.
I have nginx as frontend to serve static and nodejs as backend. Here is my OS X /private/etc/hosts file:

...

127.0.0.1 dev-testy.com
127.0.0.1 www.dev-testy.com

Here is nginx config:

http {
  include               mime.types;
  default_type          application/octet-stream;
  sendfile              on;
  keepalive_timeout     65;

  charset               utf-8;
  gzip                  on;

  server {
    listen              80;
    server_name         dev-testy.com www.dev-testy.com;

    location / {
      proxy_pass        http://localhost:8000;
      proxy_set_header  Host $host;
    }

    location ^~ /statics/ {
      root              /Users/vahrammer/Sites/Localhost/testy.com;
    }
  }
}

When i connected to internet with my 3g modem, I get such ip 10.230.68.31 (for example).
In guest Windows i edit C:\system32\drivers\etc\hosts and flush dns cache - no effect.
Here is hosts of Windows:

...

10.211.55.255	dev-testy.com
10.211.55.255	www.dev-testy.com

Thank you.