i certainly dont have as much experience as you, but i wasnt even aware there were 4 dns servers. i have only ever used/seen 2 dns servers for my area (which were auto-configured by my router) and neither one of them has ever had any issues in all the years ive been with cox
That may depend on both the area you are in (what Cox DHCP server you are on, only Cox would truely know what options are present on the server end) and how many DNS server addresses your home router will accept.
They Cox DHCP server I am on is currently handing me the DNS servers, in presented order: 68.105.28.13, 68.105.29.13, 68.105.28.14, 68.105.29.14
The .28.13 and .29.14 DNS servers are currently correctly returning NXDOMAIN. The .29.13 and .28.14 servers are currently hijacking DNS requests.
~]$ dig @68.105.28.13 www.nonexistantmadeupdomain.com
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 48476
~]$ dig @68.105.29.13 www.nonexistantmadeupdomain.com
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29495
www.nonexistantmadeupdomain.com. 0 IN A 92.242.140.2
92.242.140.2 - Cox "Enhanced Results" search page
