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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/ct_helpers.nft

#!/usr/sbin/nft -f

# This example file shows how to use ct helpers in the nftables framework.
# Note that nftables includes interesting improvements compared to how this
# was done with iptables, such as loading multiple helpers with a single rule
# This script is meant to be loaded with `nft -f <file>`
# You require linux kernel >= 4.12 and nft >= 0.8
# For up-to-date information please visit https://wiki.nftables.org

# Using ct helpers is an important security feature when doing stateful
# firewalling, since it mitigate certain networking attacks.
# More info at: https://home.regit.org/netfilter-en/secure-use-of-helpers/


flush ruleset
table inet filter {
	# declare helpers of this table
	ct helper ftp-standard {
		type "ftp" protocol tcp;
		l3proto inet
	}
	ct helper sip-5060 {
		type "sip" protocol udp;
		l3proto inet
	}
	ct helper tftp-69 {
		type "tftp" protocol udp
		l3proto inet
	}

	chain input {
		type filter hook input priority 0; policy drop;
		ct state established,related accept

		# assign a single helper in a single rule
		tcp dport 21 ct helper set "ftp-standard"

		# assign multiple helpers in a single rule
		ct helper set udp dport map {
	                        69 : "tftp-69", \
		                5060 : "sip-5060" }
	}
}

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