[asterisk-users] [Fwd: Re: Strange network issue]

[Ishfaq Malik]

-------- Forwarded Message --------
From: Ishfaq Malik <ish at pack-net.co.uk>
To: Mike Diehl <mdiehl at diehlnet.com>
Subject: Re: [asterisk-users] Strange network issue
Date: Fri, 22 Jul 2011 09:55:53 +0100

On Fri, 2011-07-22 at 02:53 -0600, Mike Diehl wrote:
> On Friday 22 July 2011 2:42:12 am Ishfaq Malik wrote:
> > On Fri, 2011-07-22 at 02:38 -0600, Mike Diehl wrote:
> > > On Friday 22 July 2011 1:42:33 am Ishfaq Malik wrote:
> > > > On Thu, 2011-07-21 at 17:13 -0600, Mike Diehl wrote:
> > > > > Hi all,
> > > > > 
> > > > > I've got a strange problem with a customer's phones.
> > > > > 
> > > > > They've got a bunch of Grandstreams that seem to be rock solid...
> > > > > until 7:00pm.  At 7:00, some of the phones become unavailable, and
> > > > > stay down. Call quality is solid almost all the time.  But right at
> > > > > 7:00, things go bad.  Only some of the phone lines go down and they
> > > > > stay down until the phone is rebooted.
> > > > > 
> > > > > I'm not even sure what to look for when I go to the site.  Any ideas?
> > > > 
> > > > Are the phones running on the same connection as the computers/servers?
> > > > If so, are they doing any scheduled backups?
> > > > 
> > > > Ish
> > > 
> > > No, the phones are in a different city than the servers and connected via
> > > the Internet.
> > > 
> > > The users probably aren't sophisticated enough to be running a scheduled
> > > backup... <wink>
> > 
> > Are the phones on the same LAN as the * or is the * somewhere else on
> > the net?
> > 
> > Is the * using DADHI or SIP to dial in/out?
> 
> Different LAN/NET and no DADHI.
> 
Would you be able to use a diagnostic utility such as smokeping to
monitor the DSL connection that the phones are connected to? If not
maybe just even do a trace route to the IP of the connection of the
phones and see if you notice and sudden drops in latency or packet loss
around 7. I'm just wondering if it's some sort of DSL contention issue
or if the ISP is doing any traffic shaping exercises at that time...

Oops! been sending replied off list!

-- 
Ishfaq Malik
Software Developer
PackNet Ltd

Office:   0161 660 3062