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。 .
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Current File : //proc/thread-self/root/usr/share/doc/nftables/examples/load_balancing.nft
#!/usr/sbin/nft -f

# This example file shows how to implement load balancing using the nftables
# framework.
# This script is meant to be loaded with `nft -f <file>`
# You require linux kernel >= 4.12 and nft >= 0.7
# For up-to-date information please visit https://wiki.nftables.org

flush ruleset

table ip nat {
	chain prerouting {
		type nat hook prerouting priority -300;
		# round-robing load balancing between the 2 IPv4 addresses:
		dnat to numgen inc mod 2 map {
				0 : 192.168.10.100, \
				1 : 192.168.20.200 }
		# emulate flow distribution with different backend weights using intervals:
		dnat to numgen inc mod 10 map {
				0-5 : 192.168.10.100, \
				6-9 : 192.168.20.200 }
		# tcp port based distribution is also possible:
		ip protocol tcp dnat to 192.168.1.100 : numgen inc mod 2 map {
				0 : 4040 ,\
				1 : 4050 }
		# consistent hash-based distribution:
		dnat to jhash ip saddr . tcp dport mod 2 map {
				0 : 192.168.20.100, \
				1 : 192.168.30.100 }
	}
}

table ip raw {
	chain prerouting {
		type filter hook prerouting priority -300;
		# using stateless NAT, round-robing distribution (you could use hashing too):
		tcp dport 80 notrack ip daddr set numgen inc mod 2 map { 0 : 192.168.1.100, 1 : 192.168.1.101 }
	}
}

table netdev mytable {
	chain ingress {
		# mind the NIC devices, they must exist in the system
		type filter hook ingress device eth0 priority 0;
		# using Direct Server Return (DSR), connectionless approach:
		udp dport 53 ether saddr set aa:bb:cc:dd:ff:ee ether daddr set numgen inc mod 2 map {
					0 : aa:aa:aa:aa:aa:aa,
					1 : bb:bb:bb:bb:bb:bb } fwd to eth1
		# using Direct Server Return (DSR), connection-oriented flows:
		 tcp dport 80 ether saddr set aa:bb:cc:dd:ff:ee ether daddr set jhash ip saddr . tcp sport mod 2 map {
					0 : aa:aa:aa:aa:aa:aa,
					1 : bb:bb:bb:bb:bb:bb } fwd to eth1
	}
}

haha - 2025