Hi, I have configured failover with simple (single) recursion on my Mikrotik CCR1009. I’m checking if the google DNS - 8.8.8.8 or 8.8.4.4 are available through the first and 2nd ISP respectively. In the IP->DNS section I’m using currently 1.1.1.1 and 1.0.0.1 Everything was working fine until recent days, but my colleagues are complaining when trying to send some mail - thunderbird says cant connect to smtp.gmail.com. I personally don’t see other errors, but this is very frustrating for me. Colleague is getting reservations constantly and has to import them to the system, responding to messages to guests on booking. We pay for internet connection to 2 ISP’s with the main ISP having 300mbit/s, and the 2nd is guaranteed using it as a backup - speed is 100mbit/s 100%.
Here is my DNS server config. PC’s on every VLAN are using the DNS of the mikrotik respectively - 192.168.1.1, 192.168.2.1
/ip dns
set allow-remote-requests=yes cache-size=20480KiB servers=1.1.1.1,1.0.0.1
The configuration before couple of days with 2nd public DNS as 9.9.9.9
Should I change the DNS servers to Cisco’s OpenDNS? Are they more efficient?
Thank you.