Re: Strange DNS Issue some site not accessable
☼ Best Answerby Akbar ali 2017/10/26 02:06:02
Most carriers will only answer requests for their subnets. 22.214.171.124 (Google DNS) will answer queries from anywhere. That is what is know as an open DNS server. If your AD DNS server was configured correctly, then all agents using it should be able to get DNS queries from anywhere. I would look closer into that box to see if maybe it is passing queries through instead of interpreting (recursing) those queries. Also if you DIA link is reaching the primary link DNS server, this could prevent queries from completing for the above reason. Since the query is coming from an IP address on the DIA side, the primary will just drop it. Either choose a neutral server, or make sure that all DNS queries exit from the path you need them to.
Hope that wasn't too long winded.