diff --git a/README.md b/README.md
index ac62da6..2687364 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@
 <match foo>
   type remote_syslog
   host example.com
-  port 25
+  port 514
   severity debug
   tag fluentd
 </match>
diff --git a/lib/fluent/plugin/out_remote_syslog.rb b/lib/fluent/plugin/out_remote_syslog.rb
index 171b813..6580210 100644
--- a/lib/fluent/plugin/out_remote_syslog.rb
+++ b/lib/fluent/plugin/out_remote_syslog.rb
@@ -14,7 +14,7 @@ class RemoteSyslogOutput < Fluent::Output
     include Fluent::Mixin::RewriteTagName
 
     config_param :host, :string
-    config_param :port, :integer, :default => 25
+    config_param :port, :integer, :default => 514
 
     config_param :facility, :string, :default => "user"
     config_param :severity, :string, :default => "notice"
@@ -26,6 +26,12 @@ def initialize
       @loggers = {}
     end
 
+    def start
+      super
+      require 'resolv'
+      @host_ip = Resolv.getaddress(@host)
+    end
+
     def shutdown
       super
       @loggers.values.each(&:close)
@@ -41,7 +47,7 @@ def emit(tag, es, chain)
         end
 
         tag = rewrite_tag!(tag.dup)
-        @loggers[tag] ||= RemoteSyslogLogger::UdpSender.new(@host,
+        @loggers[tag] ||= RemoteSyslogLogger::UdpSender.new(@host_ip,
           @port,
           facility: @facility,
           severity: @severity,
diff --git a/test/plugin/out_remote_syslog.rb b/test/plugin/out_remote_syslog.rb
index d23af7a..752b72f 100644
--- a/test/plugin/out_remote_syslog.rb
+++ b/test/plugin/out_remote_syslog.rb
@@ -14,7 +14,7 @@ def test_configure
     d = create_driver %[
       type remote_syslog
       hostname foo.com
-      host example.com
+      host localhost
       port 5566
       severity debug
       tag minitest
@@ -29,7 +29,7 @@ def test_configure
 
     logger = loggers.values.first
 
-    assert_equal "example.com", logger.instance_variable_get(:@remote_hostname)
+    assert_equal "127.0.0.1", logger.instance_variable_get(:@remote_hostname)
     assert_equal 5566, logger.instance_variable_get(:@remote_port)
 
     p = logger.instance_variable_get(:@packet)