On Tue, Apr 26, 2005 at 03:04:25PM -0400, Patrick W. Gilmore <[EMAIL PROTECTED]> wrote a message of 46 lines which said:
> I am interested in how many name servers - caching or authoritative > - are filtering incoming and/or outgoing TCP port 53. For authoritative name servers of TLD, you can browse: http://www.generic-nic.net/dyn/mon/ And see that incoming TCP is often filtered, even on serious TLD: w: Server doesn't listen/answer on port 53 for TCP protocol * Ref: IETF RFC1035 (p.32 4.2. Transport) The DNS assumes that messages will be transmitted as datagrams or in a byte stream carried by a virtual circuit. While virtual circuits can be used for any DNS activity, datagrams are preferred for queries due to their lower overhead and better performance. * ns.cnc.ac.cn./159.226.1.1 * ns.cernet.net./202.112.0.44
