diff -uNr zabbix-3.0.3.orig/database/ibm_db2/schema.sql zabbix-3.0.3/database/ibm_db2/schema.sql
--- zabbix-3.0.3.orig/database/ibm_db2/schema.sql	2016-05-18 15:09:14.000000000 +0200
+++ zabbix-3.0.3/database/ibm_db2/schema.sql	2016-07-07 12:06:08.077327268 +0200
@@ -256,7 +256,7 @@
 	type                     integer         WITH DEFAULT '0'          NOT NULL,
 	useip                    integer         WITH DEFAULT '1'          NOT NULL,
 	ip                       varchar(64)     WITH DEFAULT '127.0.0.1'  NOT NULL,
-	dns                      varchar(64)     WITH DEFAULT ''           NOT NULL,
+	dns                      varchar(255)    WITH DEFAULT ''           NOT NULL,
 	port                     varchar(64)     WITH DEFAULT '10050'      NOT NULL,
 	bulk                     integer         WITH DEFAULT '1'          NOT NULL,
 	PRIMARY KEY (interfaceid)
diff -uNr zabbix-3.0.3.orig/database/mysql/schema.sql zabbix-3.0.3/database/mysql/schema.sql
--- zabbix-3.0.3.orig/database/mysql/schema.sql	2016-05-18 15:09:14.000000000 +0200
+++ zabbix-3.0.3/database/mysql/schema.sql	2016-07-07 12:05:41.736163269 +0200
@@ -256,7 +256,7 @@
 	`type`                   integer         DEFAULT '0'               NOT NULL,
 	`useip`                  integer         DEFAULT '1'               NOT NULL,
 	`ip`                     varchar(64)     DEFAULT '127.0.0.1'       NOT NULL,
-	`dns`                    varchar(64)     DEFAULT ''                NOT NULL,
+	`dns`                    varchar(255)    DEFAULT ''                NOT NULL,
 	`port`                   varchar(64)     DEFAULT '10050'           NOT NULL,
 	`bulk`                   integer         DEFAULT '1'               NOT NULL,
 	PRIMARY KEY (interfaceid)
diff -uNr zabbix-3.0.3.orig/database/oracle/schema.sql zabbix-3.0.3/database/oracle/schema.sql
--- zabbix-3.0.3.orig/database/oracle/schema.sql	2016-05-18 15:09:14.000000000 +0200
+++ zabbix-3.0.3/database/oracle/schema.sql	2016-07-07 12:06:28.151359267 +0200
@@ -256,7 +256,7 @@
 	type                     number(10)      DEFAULT '0'               NOT NULL,
 	useip                    number(10)      DEFAULT '1'               NOT NULL,
 	ip                       nvarchar2(64)   DEFAULT '127.0.0.1'       ,
-	dns                      nvarchar2(64)   DEFAULT ''                ,
+	dns                      nvarchar2(255)  DEFAULT ''                ,
 	port                     nvarchar2(64)   DEFAULT '10050'           ,
 	bulk                     number(10)      DEFAULT '1'               NOT NULL,
 	PRIMARY KEY (interfaceid)
diff -uNr zabbix-3.0.3.orig/database/postgresql/schema.sql zabbix-3.0.3/database/postgresql/schema.sql
--- zabbix-3.0.3.orig/database/postgresql/schema.sql	2016-05-18 15:09:14.000000000 +0200
+++ zabbix-3.0.3/database/postgresql/schema.sql	2016-07-07 12:06:43.987273267 +0200
@@ -256,7 +256,7 @@
 	type                     integer         DEFAULT '0'               NOT NULL,
 	useip                    integer         DEFAULT '1'               NOT NULL,
 	ip                       varchar(64)     DEFAULT '127.0.0.1'       NOT NULL,
-	dns                      varchar(64)     DEFAULT ''                NOT NULL,
+	dns                      varchar(255)    DEFAULT ''                NOT NULL,
 	port                     varchar(64)     DEFAULT '10050'           NOT NULL,
 	bulk                     integer         DEFAULT '1'               NOT NULL,
 	PRIMARY KEY (interfaceid)
diff -uNr zabbix-3.0.3.orig/database/sqlite3/schema.sql zabbix-3.0.3/database/sqlite3/schema.sql
--- zabbix-3.0.3.orig/database/sqlite3/schema.sql	2016-05-18 15:09:14.000000000 +0200
+++ zabbix-3.0.3/database/sqlite3/schema.sql	2016-07-07 12:07:06.194371268 +0200
@@ -256,7 +256,7 @@
 	type                     integer         DEFAULT '0'               NOT NULL,
 	useip                    integer         DEFAULT '1'               NOT NULL,
 	ip                       varchar(64)     DEFAULT '127.0.0.1'       NOT NULL,
-	dns                      varchar(64)     DEFAULT ''                NOT NULL,
+	dns                      varchar(255)    DEFAULT ''                NOT NULL,
 	port                     varchar(64)     DEFAULT '10050'           NOT NULL,
 	bulk                     integer         DEFAULT '1'               NOT NULL,
 	PRIMARY KEY (interfaceid)
diff -uNr zabbix-3.0.3.orig/frontends/php/include/schema.inc.php zabbix-3.0.3/frontends/php/include/schema.inc.php
--- zabbix-3.0.3.orig/frontends/php/include/schema.inc.php	2016-05-18 14:59:37.000000000 +0200
+++ zabbix-3.0.3/frontends/php/include/schema.inc.php	2016-07-07 12:14:38.428375268 +0200
@@ -1156,7 +1156,7 @@
 			'dns' => [
 				'null' => false,
 				'type' => DB::FIELD_TYPE_CHAR,
-				'length' => 64,
+				'length' => 255,
 				'default' => '',
 			],
 			'port' => [
diff -uNr zabbix-3.0.3.orig/frontends/php/include/views/js/configuration.host.edit.js.php zabbix-3.0.3/frontends/php/include/views/js/configuration.host.edit.js.php
--- zabbix-3.0.3.orig/frontends/php/include/views/js/configuration.host.edit.js.php	2016-05-18 14:59:37.000000000 +0200
+++ zabbix-3.0.3/frontends/php/include/views/js/configuration.host.edit.js.php	2016-07-07 12:18:37.735969269 +0200
@@ -16,7 +16,7 @@
 		</div>
 	</td>
 	<td class="interface-dns">
-		<input name="interfaces[#{iface.interfaceid}][dns]" type="text" style="width: <?= ZBX_TEXTAREA_INTERFACE_DNS_WIDTH ?>px" maxlength="64" value="#{iface.dns}">
+		<input name="interfaces[#{iface.interfaceid}][dns]" type="text" style="width: <?= ZBX_TEXTAREA_INTERFACE_DNS_WIDTH ?>px" maxlength="255" value="#{iface.dns}">
 	</td>
 	<?= (new CCol(
 			(new CRadioButtonList('interfaces[#{iface.interfaceid}][useip]', null))
diff -uNr zabbix-3.0.3.orig/include/db.h zabbix-3.0.3/include/db.h
--- zabbix-3.0.3.orig/include/db.h	2016-05-18 14:59:35.000000000 +0200
+++ zabbix-3.0.3/include/db.h	2016-07-07 12:19:46.954561268 +0200
@@ -92,11 +92,11 @@
 #define HOST_IPMI_PASSWORD_LEN		20
 #define HOST_IPMI_PASSWORD_LEN_MAX	(HOST_IPMI_PASSWORD_LEN + 1)
 
-#define INTERFACE_DNS_LEN		64
+#define INTERFACE_DNS_LEN		255
 #define INTERFACE_DNS_LEN_MAX		(INTERFACE_DNS_LEN + 1)
 #define INTERFACE_IP_LEN		64
 #define INTERFACE_IP_LEN_MAX		(INTERFACE_IP_LEN + 1)
-#define INTERFACE_ADDR_LEN		64	/* MAX(INTERFACE_DNS_LEN,INTERFACE_IP_LEN) */
+#define INTERFACE_ADDR_LEN		255	/* MAX(INTERFACE_DNS_LEN,INTERFACE_IP_LEN) */
 #define INTERFACE_ADDR_LEN_MAX		(INTERFACE_ADDR_LEN + 1)
 #define INTERFACE_PORT_LEN		64
 #define INTERFACE_PORT_LEN_MAX		(INTERFACE_PORT_LEN + 1)