[NTLUG:Discuss] Sendmail slow to respond

[Neil Aggarwal]

Patrick:

That was it.  I had to setup a reverse DNS zone for
the private IP subnet we are using and it worked.

I don't understand what changed from yesterday.  It
was working fine without the reverse DNS.  What
could have changed?

Thanks,
	Neil


--
Neil Aggarwal, JAMM Consulting, (214)986-3533, www.JAMMConsulting.com
FREE! Valuable info on how your business can reduce operating costs by
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> -----Original Message-----
> From: discuss-bounces at ntlug.org 
> [mailto:discuss-bounces at ntlug.org] On Behalf Of Patrick R. Michaud
> Sent: Thursday, May 12, 2005 2:46 PM
> To: NTLUG Discussion List
> Subject: Re: [NTLUG:Discuss] Sendmail slow to respond
> 
> 
> On Thu, May 12, 2005 at 01:58:00PM -0500, Neil Aggarwal wrote:
> > Jay:
> > 
> > I tried several digs from the machine and several nslookups from
> > my laptop.  They all come back quickly and just fine.
> 
> Are you testing forward resolution or reverse resolution?
> 
> Sendmail isn't trying to find the IP address of the host from its
> DNS name (i.e., forward resolution) -- it's trying to find out the
> name of the connecting host from its IP address (reverse resolution).
> This makes it sound like there are some reverse-IP addresses missing
> somewhere.
> 
> In other words, if you're connecting from "somewhere.com" at IP
> address 24.1.26.250, you need to be seeing how long it takes to 
> resolve 24.1.26.250, not "somewhere.com".
> 
> Pm
> 
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