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BIND 4 name servers always send queries from port 53, the well-known port for DNS servers, to port 53. Resolvers, on the other hand, usually send queries from high-numbered ports (above 1023) to port 53. Though name servers clearly have to send their queries to the DNS port on a remote host, there's no reason they have to send the queries from the DNS port. And, wouldn't you know it, BIND 8 and 9 name servers don't send queries from port 53 by default. Instead, they send queries from high-numbered ports, the same as resolvers do.