To find out how the ISP limits one subnet, I 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 IP addresses. However, I canít access/ping any web sites.
By default, the DNS is USR router IP, 192.168.1.1. I changed the DNS to 18.104.22.168 and also the ISP DNS. None of them work. I event assigned the DNS (mentioned above DNS IP) manually on the computer, but could not make it work. Can I conclude that the ISP limits the DNS to subnet 192.168.0.0/24 (for example, limits outbound port 53 to 192.168.1.0.24)?
If yes, what should they do to let remote office access the internet? If not, why canít they access the Internet?
By the way, at this time I just setup a XP computer in the main office for branch office access using RDC and from that computer go to the internet.