BIND only resolves hostname on the second attempt

SilentRage bind-users at
Mon Nov 1 22:27:54 UTC 2004

EDNS is far from microsoft specific.  EDNS is standardized by RFC 2671.


--- Originally written by: Brian Kendig <brian at> ---
> 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.

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