Remote office can't access the Internet because of the DNS

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Remote Office can't access the Internet because of the DNS

Situation: a small company just opens a new office in a remote side. Both offices connect via T1 line and they can share each other. In the main office, they have another T1 line connecting to the Internet. However, the remote office can’t access the Internet through the main office Internet.

Troubleshooting: To find out the problem, we setup a USR8200 router in the main office. The LAN IP is 192.168.0.0/24 and USR8200 router inside IP is 192.168.1.0/24. From the 192.168.1.x (behind the USR router), I can ping any public IP, and TS/VPN to my office using public IP addresses. However, I can’t access/ping any web sites.

By default, the workstations in 192.168.1.0 subnet use USR router IP 192.168.1.1 as the DNS. I changed the DNS to 4.2.2.1 and also the ISP DNS. None of them worked. I event assigned the DNS (all mentioned above DNS IP) manually on the computer, but could not make it work.

Resolution: Create an internal DNS in the 192.168.0.0 subnet and all workstation in the 192.168.1.0 subnet use the internal DNS instead of the IPS DNS. That works.