I've prepared two test packages. One is the current Lenny package slightly modified to work in an Etch environment. The other has a proposed fix for your problem. I'd like it if you could install first the Lenny package and then the proposed fix package and rerun each of the same tests and report back results.
They can be found at http://www.kitterman.com/debian/ Note for posterity: I won't leave them there, so don't be surprised if later that's a dead link. That's not a signed repository, so please verify the md5sums of the packages: d40c236a7b592c5a51a055c3d1456650 python-dns_2.3.3-2~0etchtest_all.deb 0b94dde65e86ebc5ed59268532488c3b python-dns_2.3.3-3_all.deb Scott K
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