domain (ip ip6) {
    table filter {
        chain INPUT {
            # XMPP client connections.
            proto tcp dport 5222 ACCEPT;
            proto tcp dport 5223 ACCEPT;
            # File proxying.
            proto tcp dport 5000 ACCEPT;
            # XMPP server connections.
            proto tcp dport 5269 ACCEPT;
        }
    }
}