BIND only resolves hostname on the second attempt

[Mark Andrews]

> On Oct 28, 2004, at 8:37 PM, Mark Andrews wrote:
> 
> > 	Upgrade / configure your firewall to handle EDNS.  It is
> > 	blocking the following reply from the root servers.  Note
> > 	it is bigger than 512 byte of a standard DNS query.
> 
> Thank you for the response - I'll reconfig my firewall.
> 
> This brings up the question, though: where is EDNS coming into play?  
> My understanding is that EDNS is a Microsoft Server 2003 extension, but 
> I'm only running Mac computers here, no Microsoft.  Are the root 
> servers running Windows Server 2003?  Or does this only cause a problem 
> when I try to resolve a site whose primary DNS is running Windows 
> Server 2003?
> 
> And why would this problem have only started occurring a few days ago 
> to me (and to Scott Haneda, who also reported it)?  Why would a 
> Microsoft feature break things for those of us who aren't using 
> anything Microsoft?
> 
> Thanks for any info.  I just want to get my facts straight.
> 
>    - B

	EDNS was standardised in August 1999.  BIND 9 (9.0.0 Sep 2000) has
	always supported it.  BIND 8.3.0 (Jan 2002) onwards support EDNS.

		http://www.ietf.org/rfc/rfc2671.txt

--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org