Configuring OpenDNS
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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;