UDP open ports [was: ubuntu-devel Digest, Vol 23, Issue 16]

Matthew Palmer mpalmer at hezmatt.org
Wed Jul 5 02:40:13 BST 2006

On Tue, Jul 04, 2006 at 08:55:54PM -0400, Ivan Krstic wrote:
> Dan Kegel wrote:
> > I wonder how practical it would be to get glibc to use tcp for
> > DNS requests...
> Not an option; many sites only allow AXFRs via TCP/53.

Then those sites are broken.  A DNS server must allow TCP/53 for responses
which are larger than a single UDP packet.

- Matt

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