• RSS
  • Twitter
  • FaceBook

Welcome to ISAserver.org

Forums | Register | Login | My Profile | Inbox | RSS RSS icon | My Subscription | My Forums | Address Book | Member List | Search | FAQ | Ticket List | Log Out

ISA EE and High Availability

Users viewing this topic: none

Logged in as: Guest
  Printable Version
All Forums >> [ISA Server 2004 General ] >> General >> ISA EE and High Availability Page: [1]
Login
Message << Older Topic   Newer Topic >>
ISA EE and High Availability - 5.Jul.2005 3:31:00 AM   
avilt

 

Posts: 7
Joined: 26.Jun.2005
From: Japan
Status: offline
Can I obtain High Availability with ISA EE 2004 with integrated load balancing? I do not want to use windows clustering. Thanks..
Post #: 1
RE: ISA EE and High Availability - 5.Jul.2005 3:41:00 AM   
Shaun.McKerchar

 

Posts: 22
Joined: 13.Jan.2005
From: Johannesburg, South Africa
Status: offline
quote:
Originally posted by Avil:
Can I obtain High Availability with ISA EE 2004 with integrated load balancing? I do not want to use windows clustering. Thanks..

You most certainly can... you will need 2 ISA Servers with an extra NIC for intra-array comms.

It is as simple as selecting the network you want to load balance, clicking the Enable Network Load Balancing Integration option and assigning a virtual IP address for the NLB.

(in reply to avilt)
Post #: 2
RE: ISA EE and High Availability - 7.Jul.2005 12:49:00 AM   
avilt

 

Posts: 7
Joined: 26.Jun.2005
From: Japan
Status: offline
Thanks you for the reply. What I meant was if I have an array with 2 ISA servers, if one servers goes down other server should accept web requests without user intervention. Whats is the delay during the fail over?

(in reply to avilt)
Post #: 3
RE: ISA EE and High Availability - 8.Jul.2005 9:52:00 AM   
abruggeman

 

Posts: 10
Joined: 29.Jun.2005
From: Leiden, The Netherlands
Status: offline
Hello,

We also would like to have redundancy on our ISA 2004 servers, therefore we configured integrated NLB on them. However, after some testing it seems that NLB really only is load balancing; when one server goes down, the other doesn't take over the connections.

Has anyone seen this differently?

(in reply to avilt)
Post #: 4
RE: ISA EE and High Availability - 8.Jul.2005 11:11:00 AM   
abruggeman

 

Posts: 10
Joined: 29.Jun.2005
From: Leiden, The Netherlands
Status: offline
Correction, failover does work with web proxy connections, but not with firewall-client connections.
When I configure the fw-client with the NLB-address and the first ISA server goes offline, it does not "see" the second ISA server.

(in reply to avilt)
Post #: 5
RE: ISA EE and High Availability - 12.Jul.2005 5:17:00 AM   
abruggeman

 

Posts: 10
Joined: 29.Jun.2005
From: Leiden, The Netherlands
Status: offline
Here an update of my testing. Failover works fine, also when using the firewall-client.
In the Network properties, tab Firewall Client, I first filled in one of the ISA addresses, but of course the NLB address should be filled in.

It does take a few minutes before the connection takes over however.

(in reply to avilt)
Post #: 6
RE: ISA EE and High Availability - 12.Jul.2005 5:28:00 AM   
big_dazza

 

Posts: 506
Joined: 24.Apr.2003
Status: offline
I think better to use DNS Round Robni record for firewall client

ie
create record for array in dns called array1, pointing to ip address of server 1
then create another record in dns called array1 with ip address of server2
on client, do ipconfig /flushdns to empty dns cache
ping array1
now do ipconfig /displaydns
client should show both addresses for array1 record. the top one is used first.
(next client to request array1 from dns gets them i opposite order and therefore gives you simple load balancing too.
when firewall client realises that the first listed ip address is no longer pingable, switches to second listed IP address

(in reply to avilt)
Post #: 7
RE: ISA EE and High Availability - 13.Jul.2005 3:19:00 PM   
mc1169

 

Posts: 1
Joined: 13.Jul.2005
Status: offline
I have a follow-up question about high-availability with ISA:

It seems there are two options: 1) Windows Clustering or 2) ISA EE which has NLB as opposed to Std Edition which does not (correct me if I'm wrong).

Assuming I have 2 ISA Servers--what is the best way to achieve high-availablility for forward/reverse proxy connections? Another requirement is that when a config change is made to one, the other gets the change fairly quickly.

What is the best way to achieve this?

Thanks!

(in reply to avilt)
Post #: 8
RE: ISA EE and High Availability - 14.Jul.2005 4:52:00 AM   
Optek

 

Posts: 12
Joined: 5.Jul.2005
Status: offline
If one ISA goes down the trasition time of FW Client is awfully long. I'm still diging to find If there is a way to do it better

[ July 14, 2005, 07:15 AM: Message edited by: Optek ]

(in reply to avilt)
Post #: 9
RE: ISA EE and High Availability - 14.Jul.2005 4:59:00 PM   
big_dazza

 

Posts: 506
Joined: 24.Apr.2003
Status: offline
As I said in my earlier post, use DNS round robin!

(in reply to avilt)
Post #: 10
RE: ISA EE and High Availability - 15.Jul.2005 3:42:00 AM   
Optek

 

Posts: 12
Joined: 5.Jul.2005
Status: offline
As u propably are aware of DNS RR doesn't guarantee redundancy nor load balancing.

Are there any other options?

yesterday I discovered that FW failover times may differ significantly. Sometimes I got couple seconds switch time, sometimes couple minutes switch time.

(in reply to avilt)
Post #: 11

Page:   [1] << Older Topic    Newer Topic >>
All Forums >> [ISA Server 2004 General ] >> General >> ISA EE and High Availability Page: [1]
Jump to:

New Messages No New Messages
Hot Topic w/ New Messages Hot Topic w/o New Messages
Locked w/ New Messages Locked w/o New Messages
 Post New Thread
 Reply to Message
 Post New Poll
 Submit Vote
 Delete My Own Post
 Delete My Own Thread
 Rate Posts