RE: Publish Internal Servers

No, because there's absolutely no way to determine which internal server
it should go to.

You've got a house with one door, and two people named Bob.  A
deliveryman knocks on the door, and all he's capable of saying is 'I've
got a package for Bob.'

Which Bob gets it?  Answer: Can't tell.  You need either one house per
Bob, or you need some way to further differentiate.  And most of the
major TCP/IP protocols, as I said, can't differentiate.  They have no
way to, no provision for, and no concept of.

With HTTP Host headers, you can further differentiate: "I've got a
package for Bob Smith."  But this is done at a level above the network
layer.

In other words, ISA could do it (kludge! Kludge!) if it had a proxy app
for the protocol in question.  It can do it with Web because there's a
specfic Web proxy.  You can do it with SMTP by using a front end/back
end configuration: One server running in front with routing rules (Oh,
it's going to xyz.com, so I resend it to server 1, ooops this one's
going to xxx.com, so I resend it to server 2.)

But for straight NAT based forwarding of arbitrary ports, it's one
instance of a port per IP address.

-----Original Message-----
From: Phil Clark [mailto:pc@xxxxxxxxxxxxxxxxxxxxxxx]
Sent: Thursday, August 30, 2001 12:04 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Publish Internal Servers


http://www.ISAserver.org


Surely it's possible to use two internal ip addresses if you disable
socketpooling?  Then you could use Destination sets to re-direct.
 
Cheers,
Phil.


> -----Original Message-----
> From: Thomas W. Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx] 
> Sent: 30 August 2001 16:59
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: Publish Internal Servers
> 
> 
> http://www.ISAserver.org
> 
> 
> Hi Carlos,
> 
> You will need two IP address on the external interface. For 
> example, if you want to publish two SMTP servers using Server 
> Publishing Rules, you will need to create two rule, each one 
> using a different external IP address.
> 
> HTH,
> Tom
> www.isaserver.org/shinder
> 
> 
> Thomas W Shinder, M.D., MCSE, MCT
>  
> 
> 
> -----Original Message-----
> From: carloseduardo@xxxxxxxxxxxxxx 
> [mailto:carloseduardo@xxxxxxxxxxxxxx]
> Sent: None
> To: 
> [ISAserver.org Discussion List]
> Subject: [isalist] Publish Internal Servers
> 
> 
http://www.ISAserver.org


Can I publish 2 internal servers using the same TCP port 
through ISA?
I have just one IP address assigned to my external NIC.

Thanks.

Carlos Eduardo.



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