晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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Current File : //lib/firewalld/services/dds-multicast.xml
<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>OMG DDS</short>
  <description>Open Management Group (OMG) Data Distribution Service (DDS) is protocol supporting various applications. It is usally found in control systems. This is the unicast service for domains with ID 0 to 10 and maximal possible applications (120). Please see https://community.rti.com/content/forum-topic/statically-configure-firewall-let-omg-dds-traffic-through for details.</description>
  <port protocol="udp" port="7400-7401"/>
  <port protocol="udp" port="7650-7651"/>
  <port protocol="udp" port="7900-7901"/>
  <port protocol="udp" port="8150-8151"/>
  <port protocol="udp" port="8400-8401"/>
  <port protocol="udp" port="8650-8651"/>
  <port protocol="udp" port="8900-8901"/>
  <port protocol="udp" port="9150-9151"/>
  <port protocol="udp" port="9400-9401"/>
  <port protocol="udp" port="9650-9651"/>
  <port protocol="udp" port="9900-9901"/>
  <destination ipv4="239.255.0.1"/>
</service>