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　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。 . Prv8 Shell

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Current File : //usr/share/doc/nftables/examples/sets_and_maps.nft

#!/usr/sbin/nft -f

# This example file shows how to use sets and maps in the nftables framework.
# This script is meant to be loaded with `nft -f <file>`
# For up-to-date information please visit https://wiki.nftables.org

# symbolic anonymous set definition built from symbolic singleton definitions
define int_if1	 = eth0
define int_if2	 = eth1
define int_ifs	 = { $int_if1, $int_if2 }

define ext_if1	 = eth2
define ext_if2	 = eth3
define ext_ifs	 = { $ext_if1, $ext_if2 }

# recursive symbolic anonymous set definition
define local_ifs = { $int_ifs, $ext_ifs }

# symbolic anonymous set definition
define tcp_ports = { ssh, domain, https, 123-125 }

delete table filter
table filter {
	# named set of type iface_index
	set local_ifs {
		type iface_index
	}

	# named map of type iface_index : ipv4_addr
	map nat_map {
		type iface_index : ipv4_addr
	}

	map jump_map {
		type iface_index : verdict
	}

	chain input_1 { counter; }
	chain input_2 { counter; }
	chain input {
		type filter hook input priority 0

		# symbolic anonymous sets
		meta iif $local_ifs tcp dport $tcp_ports counter

		# literal anonymous set
		meta iif { eth0, eth1 } counter

		meta iif @local_ifs counter
		meta iif vmap @jump_map

		#meta iif vmap { eth0 : jump input1, eth1 : jump input2 }
	}
}

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