RE: ISA Arrary - redunant/failover?
- From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 8 Sep 2005 06:46:46 -0700
That would depend on how you deploy them.
Also, consider that in an Enterprise array, the configuration data
that's delivered to the web proxy and firewall clients will contain
*all* of the array members.
This will cause web proxy and firewall clients to use any of the listed
ISA servers as the *client* deems necessary according to the CARP
algorithm and how the client determines the health of the last known
ISA.
-----Original Message-----
From: Paul Crisp [mailto:PCrisp@xxxxxxxxxxxxxxxxx]
Sent: Thursday, September 08, 2005 2:58 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: ISA Arrary - redunant/failover?
http://www.ISAserver.org
Is there any problem with using array over different subnets and
therefore providing LAN redundancy?
Paul Crisp
Snr Network Support Analyst
________________________________
From: Geldrop, Paul van [mailto:paul.van.geldrop@xxxxxxxxxxxxx]
Sent: 08 September 2005 08:57
To: [ISAserver.org Discussion List]
Subject: RE: [isalist] ISA Arrary - redunant/failover?
Options available to you:
- Use an Enterprise edition array consisting of multiple ISA servers.
This will ensure connectivity for your LAN clients should one of the
servers fail. It will, however, not ensure connectivity in case your
WAN-connection goes bye-bye.
- Use an Enterprise edition array consisting of multiple ISA servers and
a redundant WAN connection
This will ensure connectivity for your LAN clients should one of the
servers fail. Using a product like Rainconnect (correct me if I'm wrong,
gentlemen ?), will ensure connectivity in case your WAN-connection goes
bye-bye.
Of course, there are other points of failure you will have to consider
(redundant switches/routers at LAN-level, etc). Question is, how
desperate are you to maintain Web access for your clients ?
You will not be able to realise this scenario with one ISA 2000 Server.
You will have to examine the various options and identify the one
component in your set-up that is most likely to fail. Or, if you have
enough budget for it, implement all of the options. :P
PS: You can also Standard edition arrays, but you will have to configure
NLB manually and maintain an actual configuration on both servers
through import/export-procedures instead of being able to use central
storage for the ISA array configuration.
Regards,
Paul.
________________________________
From: Danny [mailto:nocmonkey@xxxxxxxxx]
Sent: Wed 9/7/2005 5:43 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] ISA Arrary - redunant/failover?
http://www.ISAserver.org
Goal: provide LAN clients with redunant access to the web, where
current configuration consists of one ISA 2000 server.
Would an ISA array be most suitable to accomplish this goal, or NLB,
or just another router/gateway?
Thank you,
...D
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