Re: [LARTC] long delays with NNTP after switching T1 to other ser vcie provider

Re: [LARTC] long delays with NNTP after switching T1 to other ser vcie provider

[David Koski]

Reverse DNS does not work.  Could that be it?

David

On Sat, 13 Apr 2002 12:51:35 -0500
Greg Scott <GregScott@InfraSupportEtc.com> wrote:

> Or maybe some kind of DNS issue is going on.  
> 
> - Greg
> 
> 
> -----Original Message-----
> From: David Koski [mailto:david@KosmosIsland.com]
> Sent: Saturday, April 13, 2002 10:31 AM
> To: LARTC
> Subject: [LARTC] long delays with NNTP after switching T1 to other
> servcie provider
> 
> 
> After moving a Linux server serving as a wireless gateway/router to another
> ISP,
> I noticed a problem with NNTP.  When attempting to communicate NNTP through
> the
> Linux server, there are long delays that often result in timeouts.  For
> example,
> when using the newsreader pan, I get the following errors in the log file,
> in
> reverse chronological order:
> 
> Connect Failure
> NNTP handshake failed: Error reading from socket.
> Handshake failed: Error reading from socket.
> NNTP handshake failed: Error reading from socket.
> Timed out waiting to read from the server.
> 
> 
> The Linux server is fed with a T1 from a different source.  Before changing
> over, there was no problem with NNTP.  The only other difference that would
> seem
> to matter is the reconfiguration of the server.  I only took some services
> off
> line (qmail for example) and reconfigured the routing.  All other traffic
> through the server works well, with the exception of dhcp which I haven't
> resolved yet.
> 
> I suspect a QoS control issue from upstream.  Is it possible that NNTP
> requests
> are sitting in a queue somewhere waiting for a the "right" time to dequeue?
> If
> so, would there be something I could do with the TOS that might help?  Or Am
> I
> on the wrong track?
> 
> TIA,
> David Koski
> david@KosmosIsland.com
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
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Re: [LARTC] long delays with NNTP after switching T1 to other ser vcie provider

[David Koski]

To clarify, doing a reverse DNS on me outside of the local network does not
work.  Are we on the same page?  I think that is causing a problem receiving
some mail also.

Thanks,
David

On Sun, 14 Apr 2002 01:29:44 -0500
Greg Scott <GregScott@InfraSupportEtc.com> wrote:

> I'll bet that's the right direction.  I've seen other services, 
> especially ftp, where the ftp server tries a reverse DNS and 
> gets mad or times out if it can't resolve it.  One of the dumbest 
> engineering decisions I've ever seen!  I'll bet that nntp service
> you're trying to get at does the same thing.  But the deal is,
> the nntp server might be having reverse DNS problems resolving
> your IP address to a name, not you resolving its address to a name.
> So **you**  having reverse DNS problems might not be the key.  
> 
> Remember, I am just speculating here.
> 
> - Greg
> 
> 
> 
> -----Original Message-----
> From: David Koski [mailto:david@KosmosIsland.com]
> Sent: Sunday, April 14, 2002 12:37 AM
> To: Greg Scott; LARTC
> Subject: Re: [LARTC] long delays with NNTP after switching T1 to other
> ser vcie provider
> 
> 
> Reverse DNS does not work.  Could that be it?
> 
> David
> 
> On Sat, 13 Apr 2002 12:51:35 -0500
> Greg Scott <GregScott@InfraSupportEtc.com> wrote:
> 
> > Or maybe some kind of DNS issue is going on.  
> > 
> > - Greg
> > 
> > 
> > -----Original Message-----
> > From: David Koski [mailto:david@KosmosIsland.com]
> > Sent: Saturday, April 13, 2002 10:31 AM
> > To: LARTC
> > Subject: [LARTC] long delays with NNTP after switching T1 to other
> > servcie provider
> > 
> > 
> > After moving a Linux server serving as a wireless gateway/router to
> another
> > ISP,
> > I noticed a problem with NNTP.  When attempting to communicate NNTP
> through
> > the
> > Linux server, there are long delays that often result in timeouts.  For
> > example,
> > when using the newsreader pan, I get the following errors in the log file,
> > in
> > reverse chronological order:
> > 
> > Connect Failure
> > NNTP handshake failed: Error reading from socket.
> > Handshake failed: Error reading from socket.
> > NNTP handshake failed: Error reading from socket.
> > Timed out waiting to read from the server.
> > 
> > 
> > The Linux server is fed with a T1 from a different source.  Before
> changing
> > over, there was no problem with NNTP.  The only other difference that
> would
> > seem
> > to matter is the reconfiguration of the server.  I only took some services
> > off
> > line (qmail for example) and reconfigured the routing.  All other traffic
> > through the server works well, with the exception of dhcp which I haven't
> > resolved yet.
> > 
> > I suspect a QoS control issue from upstream.  Is it possible that NNTP
> > requests
> > are sitting in a queue somewhere waiting for a the "right" time to
> dequeue?
> > If
> > so, would there be something I could do with the TOS that might help?  Or
> Am
> > I
> > on the wrong track?
> > 
> > TIA,
> > David Koski
> > david@KosmosIsland.com
> > _______________________________________________
> > LARTC mailing list / LARTC@mailman.ds9a.nl
> > http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

Re: [LARTC] long delays with NNTP after switching T1 to other ser vcie provider

[bert hubert]

On Sun, Apr 14, 2002 at 12:37:14AM -0700, David Koski wrote:
> To clarify, doing a reverse DNS on me outside of the local network does not
> work.  Are we on the same page?  I think that is causing a problem receiving
> some mail also.

Might very well be. I sould advise contacting the administrator of your NNTP
server to see if s/he has reverse lookups configured. Also contact your T1
supplier to get reverse DNS working.

If you don't have a nameserver <SHAMELESS PLUG> go to
http://www.powerdns.com </SHAMELESS PLUG>.

Regards,

bert hubert

-- 
http://www.PowerDNS.com          Versatile DNS Software & Services
http://www.tk                              the dot in .tk
http://lartc.org           Linux Advanced Routing & Traffic Control HOWTO
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