请看我的nftables如下
# Warning: table ip6 filter is managed by iptables-nft, do not touch!
table ip6 filter {
        chain INPUT {
                type filter hook input priority filter; policy accept;
                udp sport 5887 udp dport 5888 counter packets 4 bytes 3136 accept
        }

        chain FORWARD {
                type filter hook forward priority filter; policy accept;
                tcp flags syn / syn,rst counter packets 0 bytes 0 tcp option maxseg size set rt mtu
                tcp flags syn / syn,rst counter packets 0 bytes 0 tcp option maxseg size set rt mtu
        }

        chain OUTPUT {
                type filter hook output priority filter; policy accept;
        }
}
注意INPUT Chain里的第二条UDP规则，counter显示通过了4个包，诡异的地方在于，
我写了个简单程序监听UDP 5888端口，结果啥也没收到，这包有可能是在什么地方
被抛弃了呢？
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FROM 61.48.18.52