1 路由模式设置:	混合模式
 2 DNS设置:	redir_host

1. 开启转发

echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf && sysctl -p

2. NAT 规则

nft add table ip nat
nft add chain ip nat postrouting { type nat hook postrouting priority 100 \; }
nft add rule ip nat postrouting oifname "eth0" masquerade

3. 转发允许

nft add table ip filter
nft add chain ip filter forward { type filter hook forward priority 0 \; policy accept \; }

4. ShellCrash 作为透明网关的特殊配置(关键!)

nft add rule inet fw4 forward iifname "eth0" accept

5. 持久化

nft list ruleset > /etc/nftables.conf && systemctl enable --now nftables