Now I am doing a test:
On my laptop, I have a stable Internet connection through wire calbe;
for the test purpose, I add one wireless adapter on my laptop, which can find out one AccessPoint, but, which needs ID and password to provide all services.
Anyway, the current routing table is like:
===========================================================================
Interface List
0x1 ……………………… MS TCP Loopback interface
0x2 …00 06 1b cf c3 41 …… Intel(R) PRO/100 VE Network Connection – packet Scheduler Miniport
0x30004 …00 03 2f 17 5e 8f …… GL242201 – packet Scheduler Miniport
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 172.19.0.2 172.19.3.182 30
0.0.0.0 0.0.0.0 207.162.10.253 207.162.10.161 20
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
172.19.0.0 255.255.128.0 172.19.3.182 172.19.3.182 30
172.19.3.182 255.255.255.255 127.0.0.1 127.0.0.1 30
172.19.255.255 255.255.255.255 172.19.3.182 172.19.3.182 30
207.162.10.0 255.255.255.0 207.162.10.161 207.162.10.161 20
207.162.10.161 255.255.255.255 127.0.0.1 127.0.0.1 20
207.162.10.255 255.255.255.255 207.162.10.161 207.162.10.161 20
224.0.0.0 240.0.0.0 172.19.3.182 172.19.3.182 30
224.0.0.0 240.0.0.0 207.162.10.161 207.162.10.161 20
255.255.255.255 255.255.255.255 172.19.3.182 172.19.3.182 1
255.255.255.255 255.255.255.255 207.162.10.161 207.162.10.161 1
Default Gateway: 207.162.10.253
===========================================================================
Persistent Routes:
None
However, 172.19.3.182 is ip address on my wireless adapter, which can not really access to Internet; 207.162.10.161 on the wire adapter is working.
But, in my application, I want to know how to detect which one can really access to Internet?????