call mtr.add_suppression("192.0.2.4");
flush status;
flush hosts;
select @@global.debug;
@@global.debug

grant select on test.* to 'root'@'192.0.2.4';
grant select on test.* to 'root'@'santa.claus.ipv4.example.com';
select "Con1 is alive";
Con1 is alive
Con1 is alive
select current_user();
current_user()
root@localhost
set global debug= "+d,vio_peer_addr_fake_ipv4,getnameinfo_error_again";
select "Con2 is alive";
Con2 is alive
Con2 is alive
select current_user();
current_user()
root@192.0.2.4
"Dumping performance_schema.host_cache"
IP	192.0.2.4
HOST	NULL
HOST_VALIDATED	NO
SUM_CONNECT_ERRORS	0
COUNT_HOST_BLOCKED_ERRORS	0
COUNT_NAMEINFO_TRANSIENT_ERRORS	1
COUNT_NAMEINFO_PERMANENT_ERRORS	0
COUNT_FORMAT_ERRORS	0
COUNT_ADDRINFO_TRANSIENT_ERRORS	0
COUNT_ADDRINFO_PERMANENT_ERRORS	0
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
select "Con3 is alive";
Con3 is alive
Con3 is alive
select current_user();
current_user()
root@192.0.2.4
"Dumping performance_schema.host_cache"
IP	192.0.2.4
HOST	NULL
HOST_VALIDATED	NO
SUM_CONNECT_ERRORS	0
COUNT_HOST_BLOCKED_ERRORS	0
COUNT_NAMEINFO_TRANSIENT_ERRORS	2
COUNT_NAMEINFO_PERMANENT_ERRORS	0
COUNT_FORMAT_ERRORS	0
COUNT_ADDRINFO_TRANSIENT_ERRORS	0
COUNT_ADDRINFO_PERMANENT_ERRORS	0
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
set global debug= "+d,vio_peer_addr_fake_ipv4,getnameinfo_fake_ipv4,getaddrinfo_fake_good_ipv4";
select "Con4 is alive";
Con4 is alive
Con4 is alive
select current_user();
current_user()
root@192.0.2.4
"Dumping performance_schema.host_cache"
IP	192.0.2.4
HOST	santa.claus.ipv4.example.com
HOST_VALIDATED	YES
SUM_CONNECT_ERRORS	0
COUNT_HOST_BLOCKED_ERRORS	0
COUNT_NAMEINFO_TRANSIENT_ERRORS	2
COUNT_NAMEINFO_PERMANENT_ERRORS	0
COUNT_FORMAT_ERRORS	0
COUNT_ADDRINFO_TRANSIENT_ERRORS	0
COUNT_ADDRINFO_PERMANENT_ERRORS	0
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
select "Con5 is alive";
Con5 is alive
Con5 is alive
select current_user();
current_user()
root@192.0.2.4
"Dumping performance_schema.host_cache"
IP	192.0.2.4
HOST	santa.claus.ipv4.example.com
HOST_VALIDATED	YES
SUM_CONNECT_ERRORS	0
COUNT_HOST_BLOCKED_ERRORS	0
COUNT_NAMEINFO_TRANSIENT_ERRORS	2
COUNT_NAMEINFO_PERMANENT_ERRORS	0
COUNT_FORMAT_ERRORS	0
COUNT_ADDRINFO_TRANSIENT_ERRORS	0
COUNT_ADDRINFO_PERMANENT_ERRORS	0
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'@'192.0.2.4';
revoke select on test.* from 'root'@'santa.claus.ipv4.example.com';
drop user 'root'@'192.0.2.4';
drop user 'root'@'santa.claus.ipv4.example.com';
set global debug= default;