i'm trying to ping mail.example.com but failed. base on my below zone configuration.
Did I configure anything wrong?
$TTL 604800 ; 1 week
@ IN SOA serverad.example.com. root.example.com. (
232 ; serial
604800 ; refresh (1 week)
86400 ; retry (1 day)
2419200 ; expire (4 weeks)
604800 ; minimum (1 week)
)
IN NS serverad.example.com.
serverad IN A 172.17.5.121
121 IN PTR serverad.example.com.
mail IN A 172.17.5.22
22 IN PTR mail.example.com.