How can I log which interface a BIND query is received on?

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http://serverfault.com – I'm in the process of changing the IP address of my nameserver and I want a way to tell how many queries I am still receiving on the old IP address to track how well the change is being picked up. Is this something I can do in BIND9 logging or would I have to go outside it to something like tcpdump to track this? I want to still process queries on multiple IPs but I want some sign of the relative quantity of queries between the 2 IPs. (HowTos)