Issue

• getent/nslookup can resolve hostname but ping gives an error "unknown host"

# cat /etc/resolv.conf
options timeout:1
options attempts:2
options rotate
search example.com sq.example.com ch.example.com example.ad.man.com
nameserver 192.168.0.3
nameserver 192.168.0.2

• nameserver 192.168.0.3--> it is working nameserver. It gives valid info
• nameserver 192.168.0.2--> it is pingable and connectable on port 53. But it does not return any info as it does not have the info.

$ getent hosts test.example.com
10.218.65.39    test.example.com

$ ping test.example.com
ping: unknown host test.example.com