Configuring OpenDNS

A good DNS service is extremely important. Asterisk can performs a lots of DNS requests and it can lock awaiting for an answer. It is strongly suggested to configure OpenDNS servers:

nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 208.67.222.220
nameserver 208.67.220.222

If your DNS configuration is managed by NetworkManager, edit your /etc/sysconfig/network-scripts/ifcfg...

DNS1=208.67.222.222
DNS2=208.67.220.220
DNS3=208.67.222.220
DNS4=208.67.220.222

If you are using CentOS 9 and derivative distributions, edit your /etc/NetworkManager/system-connections/...nmconnection

dns=208.67.222.222;208.67.220.220;208.67.222.220;208.67.220.222;