-----Original Message----- From: Tomas L. Byrnes Sent: Saturday, August 09, 2008 9:01 PM To: 'Chris Paul' Subject: RE: maybe a dumb idea on how to fix the dns problems i don't know.... Actually, the RFCs (RFC-1034 3.7RFC-1035 4.2, ref RFC-793; Implementation spec in RFC-1035 4.2.2; RFC-2136 2.1 says TCP is "at the discretion of the requestor";) say TCP "Should" be supported. It's optional, but recommended. The source of the guidance to block TCP is misguided "security" folks who confuse self-denial of service with policy enforcement. When security breaks functionality, it usually fails to secure, as users circumvent it, in my not so humble experience. BTW: In RFC 1034 5.3.1 PVM tipped to some of the issues that we are now dealing with, under the title of "Stub Resolvers".
-----Original Message----- From: Chris Paul [mailto:chris.paul@rexconsulting.net] Sent: Saturday, August 09, 2008 3:49 PM Cc: nanog@merit.edu Subject: Re: maybe a dumb idea on how to fix the dns problems i don't know....
Paul Vixie wrote:
because TCP is considered optional by many authority DNS server operators.
it's only required if you expect AXFR or if you ever emit a TC bit. if you don't want to do TCP then you can rule out the TC bit and AXFR and just not do TCP, and you'll be dead-to-rights within
Hey authority DNS server operators. Can you make a change to your servers to always allow TCP client connections? Would this be difficult? What would be the harm? the various DNS protocol RFCs.
what RFCs forbid TCP for clients? I thought TCP was an option for clients. I'm not spending the rest of my sunday though reading rfcs....... and sure as hell not joining another list because to tell you the truth, I don't really care as much about the typical angry Sunday list poster (talk about redundant statement....)
thanks for the thoughts, though Paul. I'll leave the rest of this discussion (should it exist) to others in their forum of choice.... I'm thinking of nice insalade caprese with true mozarella di bufalo right now.... now That's A Sunday!"
CP
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