Win7 IP setting:
Step 1.【computer icon】→【Open Network and Sharing Center】

Step 2.【Change adapter settings】

Step 3.【Local Area Connection】→【Propeties】

Step 4.【Internet Protocol Version 4(TCP/IP4)】→【Properties】

Step 5.【Use the following IP address】，and set your IP address and【Subnet mask】(255.255.255. 0)and【Default gateway】
Choice the【Use the following DNS server address】，and set DNS server IP(10.253.1.1), and then【OK】