[THIN] Re: Web Interface Query - NetBT Errors
- From: "Foote, Eric" <EFoote@xxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Fri, 29 Jul 2005 09:16:55 -0400
Just a side note here:
Be sure that you understand the implications of making this change on a
permanent basis.
The TTL's purpose in life is to reduce the overhead of DNS queries from the
client's transaction perspective, reduce the load on the DNS servers and
provide the ability for the client to sustain functionality during a DNS
outage.
The refresh time for the domain is also significant if you have a multi-tiered
DNS structure (internal or external). If you change the TTL on an "A" record
at the domain primary but the downstream DNS servers are only updating once/day
because domain refresh is set to 86400, the downstream clients will not see the
change until the downstream DNS server refreshes from the primary.
DNS is one of those services that you really need to spend some time on
understanding, the implications of a misconfigured domain can be disasterous.
Microsoft has done a great job of making DNS "invisible" and "simple" and many
admins don't take the time to really understand how it works.
Eric
Eric M. Foote
Detroit Medical Center
Intel Server Group Leader
Security Group Leader
OP 5-1625
3663 Woodward Ave.
Detroit, MI 48201-2403
(313) 578-2310
<mailto:EFoote@xxxxxxx>
Fax (313) 578-2265
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Toby
Sent: Friday, July 29, 2005 5:09 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Web Interface Query - NetBT Errors
So when they say you learn something new everyday, they were right.
Thankyou very much.
Toby
On 7/28/05, Jeff Pitsch <jepitsch@xxxxxxxxx> wrote:
> Open DNS admin console, click on view, then Advanced. Then go to the
> actual entry of the record and open it. You'll now see the Time to
> Live parameters. You may want to set this one lower than the default.
> This is the setting of how long the record will reside in teh client
> side cache. For instance, if your web server goes down and a user had
> already accessed the web server, it could potentially take up to an
> hour before the record leaves the cache and the user could pull the
> correct IP.
>
> Jeff Pitsch
>
> On 7/28/05, Toby <toby.percival@xxxxxxxxx> wrote:
> > Forgive me, DNS is not my thing. How do I change the TTL (is that time
> > to live?) in DNS.
> >
> > On 7/28/05, Jeff Pitsch <jepitsch@xxxxxxxxx> wrote:
> > > No requirement, but it may be desired.
> > >
> > > Yes, you could easily change the DNS. I would change the TTL of the
> > > entry though just in case.
> > >
> > > Jeff Pitsch
> > >
> > > On 7/28/05, Toby <toby.percival@xxxxxxxxx> wrote:
> > > > Thanks for the reply Jeff.
> > > >
> > > > So no requirement for load balancing then. Ok, that is great.
> > > >
> > > > I have created an alias in DNS, 'citrix', which points to the WI server.
> > > > In a disaster recovery exercise, all I have to do is point this alias
> > > > to my backup WI server.
> > > >
> > > > Is that configuration along the right lines?
> > > >
> > > > Thanks
> > > >
> > > >
> > > >
> > > > On 7/28/05, Jeff Pitsch <jepitsch@xxxxxxxxx> wrote:
> > > > > Keep in mind that WI only does app enumeration and handoff. After a
> > > > > session is started, WI has nothing to do wiht it. So the actual load
> > > > > of 400 users is very small. Also,if your that concerned about it, I
> > > > > would recommend moving the WI serves off the Metaframe servers. One
> > > > > WI server can easily handle 400 users.
> > > > >
> > > > > Jeff Pitsch
> > > > >
> > > > > On 7/28/05, Toby <toby.percival@xxxxxxxxx> wrote:
> > > > > > Hi List,
> > > > > >
> > > > > > I have a Web Interface query.
> > > > > >
> > > > > > I have 15 Citrix servers (PS4.0 on W2K3), and three of these are WI
> > > > > > servers. Instead of having one server service 400 connections, how
> > > > > > do
> > > > > > you go about load balancing the 3 WI servers.
> > > > > >
> > > > > > What around DNS round robin?
> > > > > > Or maybe a third party app out there?
> > > > > >
> > > > > > Any ideas would be very gratefully received.
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