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forward proxy and round robin dns

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forward proxy and round robin dns - 31.Aug.2004 12:27:00 PM   
sanfrancesco

 

Posts: 16
Joined: 13.Apr.2004
From: Germany
Status: offline
Hi!

We're using ISA 2004 as a forward proxy. When the target is a web server farm load balanced by round robin DNS, the ISA server apparently issues a DNS client request for every HTTP request, resulting in the fact that specific Web Proxy Clients are redirected to different web servers during a user session. Since session persistence works per-server, this results in problems with web applications on such target web server farms.

The only solution apparent to me is to hardcode one of the web servers into the hosts file, thereby creating a SPOF.

Does anybody know how to change the ISA server behaviour for DNS round robin ?
Post #: 1
RE: forward proxy and round robin dns - 1.Sep.2004 3:38:00 PM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi San,

You might try disabling name resolution on the ISA firewall. Please appreciate the security risks incumbent in this decision.

There's a script on the www.microsoft.com that will allow this.

HTH,
Tom

(in reply to sanfrancesco)
Post #: 2
RE: forward proxy and round robin dns - 1.Sep.2004 6:42:00 PM   
sanfrancesco

 

Posts: 16
Joined: 13.Apr.2004
From: Germany
Status: offline
Thanks Tom!

I think I'll go with hardcoding, since disabling name resolution will result in disabling my internet proxy.

Thanks for the tip.

(in reply to sanfrancesco)
Post #: 3
RE: forward proxy and round robin dns - 3.Sep.2004 1:08:00 PM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi SF,

Great!

Thanks!
Tom

(in reply to sanfrancesco)
Post #: 4

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