版本是2.2.0

dns.Query的构造函数定义：

    def __init__(self, name='', type=A, cls=IN):
        """
        @type name: C{str}
        @param name: The name about which to request information.

        @type type: C{int}
        @param type: The query type.

        @type cls: C{int}
        @param cls: The query class.
        """
        self.name = Name(name)
        self.type = type
        self.cls = cls

 root.Resolver 里的一个调用

    def discoveredAuthority(self, auth, name, cls, type, timeout):
        from twisted.names import client

        q = dns.Query(name, cls, type)

        r = client.Resolver(servers=[(auth, dns.PORT)])
        d = r.queryUDP([q], timeout)
        d.addCallback(r.filterAnswers)
        return d

cache.CacheResolver里的一个调用

    def _lookup(self, name, cls, type, timeout):
        now = time.time()
        q = dns.Query(name, cls, type)
        try:
            when, (ans, auth, add) = self.cache[q]
        except KeyError:
            if self.verbose > 1:
                log.msg('Cache miss for ' + repr(name))
            return defer.fail(failure.Failure(dns.DomainError(name)))
        else:
            ............

两个调用参数cls, type的位置写反了

我也不懂DNS协议，程序里mx记录一直查询为空，最后用的commview跟踪nslookup命名和我的程序的UDP数据，发现最后4个字节的位置反了，才发现这个问题的
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