Hi all,
Well I thought that I would update you on this problem.
The problem was that the firewall had negotiated a 100/Full connection
to the hub. This as you all know is bad. It took a bit of digging since
I was focusing on the server and not the firewall. I reset the lint to
100/half and no more packet loss. I was seeing a constant 10 to 50%
packet loss on the link.
Goran Jovanovic
The LAN Shoppe
2345 Yonge Street, Suite 302
Toronto, Ontario M4P 2E5
Phone: (416) 440-1167 x-2113
Cell: (416) 931-0688
E-Mail: [EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of TC Roffey
Sent: Friday, January 02, 2004 5:08 PM
To: [EMAIL PROTECTED]
Subject: RE: [WhatsUp Forum] DNS services continuously going down and up
Or.......
You're going over a vpn tunnel, right? I've got wug going over a cisco
vpn as well. And cisco says - In order for the tunnel to stay "up", a
certain amount of interesting traffic at sufficient intervals needs to
traverse the tunnel otherwise the vpn routers "times out" and takes down
the tunnel. So, the first dns query from whatever, user or wug, may not
be getting to the dns server. Result, dns service down. Wug tries
again and the service is there because the first query brought the
tunnel back up.
TC
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bond, Duncan
Sent: Friday, January 02, 2004 1:49 PM
To: '[EMAIL PROTECTED]'
Subject: RE: [WhatsUp Forum] DNS services continuously going down and up
You should also note that if WUG is having the problem, so (most
probably) are the users of the DNS server. This can manifest in slow or
broken sessions; if the users have a backup server defined, transactions
will work, but will be slow because it takes time for the DNS failure to
retry, then switch. We had a similar problem caused by improper duplex
negotiation between DNS server and switch; WUG accurately reported
intermittency on the server.
-----Original Message-----
From: Daniel Donnelly [mailto:[EMAIL PROTECTED]
Sent: Friday, January 02, 2004 4:41 PM
To: [EMAIL PROTECTED]
Subject: Re: [WhatsUp Forum] DNS services continuously going down and up
Goran,
Have you tried increasing the Timeout on that device? I'd double it, for
now...
I suspect some unknown load (Exchange??) on the server is causing a
random delay is answering the DNS query. Setting a longer timeout may
cause the device to be seen as up more often . In other words, the
longer timeout may help, but may not make the problem go away, just
won't show up as often in WUG.
If the longer timeout helps, then I'd look more carefully at that server
for resource issues...
Dan Donnelly
----- Original Message -----
From: "Goran Jovanovic" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, January 02, 2004 9:01 AM
Subject: RE: [WhatsUp Forum] DNS services continuously going down and up
It is a Windows 2000 server, SP 4 running Exchange 2000 SP3 for about 20
users. Not really high load at all.
Goran Jovanovic
The LAN Shoppe
2345 Yonge Street, Suite 302
Toronto, Ontario M4P 2E5
Phone: (416) 440-1167 x-2113
Cell: (416) 931-0688
E-Mail: [EMAIL PROTECTED]
_____
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John
Tolmachoff
(Lists)
Sent: Friday, January 02, 2004 2:05 AM
To: [EMAIL PROTECTED]
Subject: RE: [WhatsUp Forum] DNS services continuously going down and up
Is the DNS server a Windows server 200x server under very high query
load with a large cache?
John Tolmachoff
Engineer/Consultant/Owner
eServices For You
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Goran
Jovanovic
Sent: Thursday, January 01, 2004 8:52 PM
To: [EMAIL PROTECTED]
Subject: [WhatsUp Forum] DNS services continuously going down and up
Hi All and Happy New Year to everyone,
I am monitoring a number of my client's servers via a VPN tunnel and
there is this one server that is setup just like all the others but it
keeps reporting that the DNS services goes down. Then on the next poll
(or so) the services comes back to life. Life is fine for 30 to 90
minutes when the DNS goes down again. I have the alarm trigger set to 4.
I have checked the server and there are no entries in the event log for
problems.
Any thoughts on what could be causing the DNS to fail and then reappear?
Thanx
Goran Jovanovic
The LAN Shoppe
2345 Yonge Street, Suite 302
Toronto, Ontario M4P 2E5
Phone: (416) 440-1167 x-2113
Cell: (416) 931-0688
E-Mail: [EMAIL PROTECTED]
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