FW: maybe a dumb idea on how to fix the dns problems i don't know....

Tomas L. Byrnes tomb at byrneit.net
Sun Aug 10 14:37:27 CDT 2008


-----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

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 at rexconsulting.net]
> Sent: Saturday, August 09, 2008 3:49 PM
> Cc: nanog at 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.
> >   
> 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?
> > 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
> 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
> --
> Chris Paul
> Rex Consulting, Inc
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