call mtr.add_suppression("santa.claus.ipv4.example.com");
flush status;
flush hosts;
flush user_resources;
flush privileges;
select `User`, `Host` from mysql.`user` where `host` like '%\\%%';
User	Host
select `User`, `Host` from mysql.`user` where `user` like '192.%';
User	Host
select `User`, `Host` from mysql.`user` where `user` like '2001:%';
User	Host
select `User`, `Host` from mysql.`user` where `user` like 'santa.claus.%';
User	Host
create user 'root'@'santa.claus.ipv4.example.com';
grant select on test.* to 'root'@'santa.claus.ipv4.example.com';
create user 'root'@'192.0.2.4';
grant select on test.* to 'root'@'192.0.2.4';
connect  con1,"127.0.0.1",root,,test,$MASTER_MYPORT,;
select "Con1 is alive";
Con1 is alive
Con1 is alive
select current_user();
current_user()
root@localhost
disconnect con1;
connection default;
SET @saved_dbug = @@GLOBAL.debug_dbug;
set global debug_dbug= "+d,vio_peer_addr_fake_ipv4,getnameinfo_fake_ipv4,getaddrinfo_error_noname";
connect  con2,"127.0.0.1",root,,test,$MASTER_MYPORT,;
select "Con2 is alive";
Con2 is alive
Con2 is alive
select current_user();
current_user()
root@192.0.2.4
disconnect con2;
connection default;
"Dumping performance_schema.host_cache"
IP	192.0.2.4
HOST	NULL
HOST_VALIDATED	YES
SUM_CONNECT_ERRORS	0
COUNT_HOST_BLOCKED_ERRORS	0
COUNT_NAMEINFO_TRANSIENT_ERRORS	0
COUNT_NAMEINFO_PERMANENT_ERRORS	0
COUNT_FORMAT_ERRORS	0
COUNT_ADDRINFO_TRANSIENT_ERRORS	0
COUNT_ADDRINFO_PERMANENT_ERRORS	1
COUNT_FCRDNS_ERRORS	0
COUNT_HOST_ACL_ERRORS	0
COUNT_NO_AUTH_PLUGIN_ERRORS	0
COUNT_AUTH_PLUGIN_ERRORS	0
COUNT_HANDSHAKE_ERRORS	0
COUNT_PROXY_USER_ERRORS	0
COUNT_PROXY_USER_ACL_ERRORS	0
COUNT_AUTHENTICATION_ERRORS	0
COUNT_SSL_ERRORS	0
COUNT_MAX_USER_CONNECTIONS_ERRORS	0
COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS	0
COUNT_DEFAULT_DATABASE_ERRORS	0
COUNT_INIT_CONNECT_ERRORS	0
COUNT_LOCAL_ERRORS	0
COUNT_UNKNOWN_ERRORS	0
FIRST_ERROR_SEEN	set
LAST_ERROR_SEEN	set
connect  con3,"127.0.0.1",root,,test,$MASTER_MYPORT,;
select "Con3 is alive";
Con3 is alive
Con3 is alive
select current_user();
current_user()
root@192.0.2.4
disconnect con3;
connection default;
"Dumping performance_schema.host_cache"
IP	192.0.2.4
HOST	NULL
HOST_VALIDATED	YES
SUM_CONNECT_ERRORS	0
COUNT_HOST_BLOCKED_ERRORS	0
COUNT_NAMEINFO_TRANSIENT_ERRORS	0
COUNT_NAMEINFO_PERMANENT_ERRORS	0
COUNT_FORMAT_ERRORS	0
COUNT_ADDRINFO_TRANSIENT_ERRORS	0
COUNT_ADDRINFO_PERMANENT_ERRORS	1
COUNT_FCRDNS_ERRORS	0
COUNT_HOST_ACL_ERRORS	0
COUNT_NO_AUTH_PLUGIN_ERRORS	0
COUNT_AUTH_PLUGIN_ERRORS	0
COUNT_HANDSHAKE_ERRORS	0
COUNT_PROXY_USER_ERRORS	0
COUNT_PROXY_USER_ACL_ERRORS	0
COUNT_AUTHENTICATION_ERRORS	0
COUNT_SSL_ERRORS	0
COUNT_MAX_USER_CONNECTIONS_ERRORS	0
COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS	0
COUNT_DEFAULT_DATABASE_ERRORS	0
COUNT_INIT_CONNECT_ERRORS	0
COUNT_LOCAL_ERRORS	0
COUNT_UNKNOWN_ERRORS	0
FIRST_ERROR_SEEN	set
LAST_ERROR_SEEN	set
revoke select on test.* from 'root'@'santa.claus.ipv4.example.com';
revoke select on test.* from 'root'@'192.0.2.4';
drop user 'root'@'santa.claus.ipv4.example.com';
drop user 'root'@'192.0.2.4';
SET @@GLOBAL.debug_dbug = @saved_dbug;