Some enterprise ,the USG2210 V1R3 version as to be the nerwork manager to connect external network, and it connects 2 layer switch which has connected 30 PC, they can access Internet normally. The switch connects wireless Router, the PC which has connected wireless Router cannot access Internet.
1、 After testing, PC2 can ping pass the public network interface of USG2210, we can remove the problem of route.
2、 View the session of PC1 accessing external network and PC2 accessing external network ,we can find the IP address which has access external network in the NAT address pool is different, so we change the NAT address pool to a IP address which is public network address of PC2 conversion, then we have a test and find PC2 can access Internet, test again,we use the public network address of PC2 conversion to be address pool, PC1 and PC2 cannot access Internet;
3、 According to the test of step 2, we can judge one of the IP in the NAT address pool is unavailable. This problem has been solved by client contacting carrier.
The PC2 uses the public IP address in the NAT address pool which is unavailable to access Internet.