Cox Business DNS - conflicting issue/server info received

Hi all,

For one of our clients with an East Coast office near Boston, MA, I'm receiving conflicting info on which DNS servers granted by their ISP to use with the LAN.

Their Cox cable modem receives the following 3 DNS servers via DHCP from Cox upon boot: 68.105.28.11 68.105.29.11 68.105.28.12

Calling their support support and using the Cox business support site note to use the following DNS servers: 68.105.28.16 68.105.29.16 https://www.cox.com/business/support/domain-name-services-mail-exchange-hosting-and-dns-server-information.html

Performing a traceroute shows 5 hops from their modem to all IP's, with similar response times on each hop through to the final destination IP:

traceroute to 68.105.28.11 (68.105.28.11), 64 hops max, 72 byte packets 1 192.168.0.1 (192.168.0.1) 1.376 ms 0.982 ms 0.922 ms 2 10.1.216.1 (10.1.216.1) 7.675 ms 7.791 ms 7.631 ms 3 100.120.244.72 (100.120.244.72) 9.566 ms 8.348 ms 10.322 ms 4 100.120.244.54 (100.120.244.54) 11.626 ms 14.604 ms 24.376 ms 5 cdns1.cox.net (68.105.28.11) 9.997 ms 8.628 ms 9.455 ms

traceroute to 68.105.29.11 (68.105.29.11), 64 hops max, 72 byte packets 1 192.168.0.1 (192.168.0.1) 2.290 ms 0.925 ms 0.960 ms 2 10.1.216.1 (10.1.216.1) 7.071 ms 7.057 ms 7.726 ms 3 100.120.244.72 (100.120.244.72) 9.186 ms 8.754 ms 9.394 ms 4 100.120.244.54 (100.120.244.54) 8.157 ms 8.271 ms 7.615 ms 5 cdns6.cox.net (68.105.29.11) 8.550 ms 8.155 ms 9.322 ms

traceroute to 68.105.28.12 (68.105.28.12), 64 hops max, 72 byte packets 1 192.168.0.1 (192.168.0.1) 2.276 ms 0.966 ms 0.928 ms 2 10.1.216.1 (10.1.216.1) 7.548 ms 17.955 ms 7.928 ms 3 100.120.244.72 (100.120.244.72) 9.668 ms 10.047 ms 8.575 ms 4 100.120.244.54 (100.120.244.54) 8.645 ms 8.465 ms 8.713 ms 5 cdns2.cox.net (68.105.28.12) 8.235 ms 8.738 ms 7.190 ms

traceroute to 68.105.28.16 (68.105.28.16), 64 hops max, 72 byte packets 1 192.168.0.1 (192.168.0.1) 2.993 ms 0.948 ms 1.636 ms 2 10.1.216.1 (10.1.216.1) 8.869 ms 12.140 ms 8.877 ms 3 100.120.244.72 (100.120.244.72) 8.243 ms 11.333 ms 8.133 ms 4 100.120.244.54 (100.120.244.54) 7.721 ms 8.360 ms 9.066 ms 5 68.105.28.16 (68.105.28.16) 9.121 ms 9.061 ms 7.796 ms

traceroute to 68.105.29.16 (68.105.29.16), 64 hops max, 72 byte packets 1 192.168.0.1 (192.168.0.1) 2.270 ms 0.968 ms 1.072 ms 2 10.1.216.1 (10.1.216.1) 35.242 ms 8.462 ms 7.867 ms 3 100.120.244.72 (100.120.244.72) 9.031 ms 7.414 ms 9.172 ms 4 100.120.244.54 (100.120.244.54) 8.185 ms 7.169 ms 8.253 ms 5 68.105.29.16 (68.105.29.16) 8.437 ms 10.793 ms 19.922 ms

Can anyone here with hopefully similar Cox service advise what DNS servers should be used here?

As I find it odd that the modem receives different DNS servers than those recommended by Cox support & the Cox support page I posted above.

Thanks all.