IPv6 방화벽 규칙이 모든 연결을 차단하는 것으로 나타남

내 소규모 서버에 방화벽이 필요하다고 판단한 후 ferm을 사용하여 iptables 및 ip6tables를 구성했습니다(이 질문에는 ferm 태그가 지정되어야 하지만 태그를 생성할 수 없었습니다).

ipv4와 ipv6에 동일한 규칙을 사용하지만 일단 방화벽을 설정하면 (모든 포트에서) IPv6 연결이 작동을 멈추고 IPv4로 전환해야 합니다. 왜 그럴까요?

내 /etc/ferm.conf

domain (ip ip6) table filter {
    chain INPUT {
        policy DROP;

        # connection tracking
        mod state state INVALID DROP;
        mod state state (ESTABLISHED RELATED) ACCEPT;

        # allow local connections
        interface lo ACCEPT;

        # respond to ping
        proto icmp icmp-type echo-request ACCEPT;

        # allow SSH connections
        proto tcp dport ssh ACCEPT;

        # allow all my lovely server stuff
        proto tcp dport (http https smtp imap imaps) ACCEPT;

        # Teamspeak 3 Server
        proto tcp dport (10011 30033) ACCEPT;
        proto udp dport 9987 ACCEPT;

        # Prosody XMPP
        proto tcp dport (5222 5269) ACCEPT;

        # ident connections are also allowed
        proto tcp dport auth ACCEPT;

        # the rest is dropped by the above policy
    }

    # outgoing connections are not limited
    chain OUTPUT policy ACCEPT;

    # this is not a router
    chain FORWARD policy DROP;
}

IP6테이블-vnL

Chain INPUT (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 DROP       all      *      *       ::/0                 ::/0                 state INVALID
   24  8224 ACCEPT     all      *      *       ::/0                 ::/0                 state RELATED,ESTABLISHED
    0     0 ACCEPT     all      lo     *       ::/0                 ::/0
    0     0 ACCEPT     icmpv6    *      *       ::/0                 ::/0                 ipv6-icmptype 128
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:22
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:80
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:443
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:25
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:143
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:993
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:10011
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:30033
    0     0 ACCEPT     udp      *      *       ::/0                 ::/0                 udp dpt:9987
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:5222
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:5269
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:113

Chain FORWARD (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 24 packets, 8224 bytes)
 pkts bytes target     prot opt in     out     source               destination