OpenDNS
OpenDNS. The first best DNS server on the list is OpenDNS. Now owned and operated by Cisco … Umbrella Roaming Client: Probes (debug.opendns.com In router/firewall logs, you may notice a lot of packets being sent to debug.opendns.com. This is the domain used by the Umbrella roaming client to determine certain characteristics about DNS connectivity, and whether connectivity is possible over certain protocols and ports. OpenDNS Community > Domain Tagging
OpenDNS family shield not working - Spiceworks
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Jun 09, 2020
OpenDNS Home VIP Review | PCMag May 21, 2015