Usage of TCP/53

Ralf Durkee rd at
Thu Sep 28 17:59:14 UTC 2006

I have a question about usage of the TCP port 53 by DNS servers in
general, and BIND in particular.  I've heard it stated that only zone
transfers use the tcp port, but it was my understanding that it could
also be used in other circumstances to handle larger
requests/responses.  Are there other uses of TCP/53?  What would they be?


-- Ralf Durkee, CISSP, GSEC, GCIH, GSNA
Principal Security Consultant

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