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Global Port Redirection

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Global Port Redirection - 25.Nov.2006 3:31:08 AM   
tomers@tomers.co.il

 

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Joined: 1.Nov.2006
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I want to be able to redirect specific port to a specific server, no matter what the original destination was, for example:
I want to be able to redirect all SMTP outbound request to a specific SMTP server, no matter what was the original destination.

_____________________________

Tomer Schwaitzer
MCT, MCSA, MCSE, CCNA
Post #: 1
RE: Global Port Redirection - 26.Nov.2006 10:42:17 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
You can already to that with ISA Firewall Access Rules.

HTH,
Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to tomers@tomers.co.il)
Post #: 2
RE: Global Port Redirection - 26.Nov.2006 10:55:04 AM   
tomers@tomers.co.il

 

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Joined: 1.Nov.2006
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Will you guide me, my friend ?

_____________________________

Tomer Schwaitzer
MCT, MCSA, MCSE, CCNA

(in reply to tshinder)
Post #: 3
RE: Global Port Redirection - 3.Dec.2006 11:39:51 AM   
tshinder

 

Posts: 50013
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From: Texas
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Hi Tomer,

You can publish the server. All traffic received on the outgoing network will be redirected to the SMTP server you've chosen.

Be mindful of route relationships between the source and destination Networks.

HTH,
Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to tomers@tomers.co.il)
Post #: 4
RE: Global Port Redirection - 14.Dec.2006 3:52:58 AM   
tomers@tomers.co.il

 

Posts: 41
Joined: 1.Nov.2006
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Not Working..

How exactly should I do it.
This is what I did:
I Published an IP address of the smtp server in the external network for all internal networks (Nat relationship) - didn't work.
I tried publishing a smtp server in the perimeter network (Route relationship to internal) - didn't work.

_____________________________

Tomer Schwaitzer
MCT, MCSA, MCSE, CCNA

(in reply to tshinder)
Post #: 5
RE: Global Port Redirection - 18.Dec.2006 9:39:10 AM   
Guest
Hi Tomers,
I'm a little confused about the:
quote:

"no matter what was the original destination."

what this exactly means?
for example if you publish a server, ISA will listen on the network adapter you have
selected and if it found a match it will forward traffic to the server you have specified.
but ISA will listen only for traffic that was intended to go to it.
this means if you forward a traffic to port 25 to a snmp server by name, the DNS will resolve that name and that name must match the ip address on the ISA interface for ISA to forward to the choosen SMTP server(which can do relay or whatever).
if the ip address is not one from those ISA is listen it will not redirect the traffic. this
will be dropped or permitted based on the rules created by you.
be carefully with traffic "redirections"(some of them might come on the incidence of some laws if you do not have permission to do so).
do you want to set some sort of SMTP relay or what exactly are you trying to accomplish?
what kind of redirection are you trying to do?
from who to who?

< Message edited by adrian_dimcev -- 18.Dec.2006 9:42:29 AM >

(in reply to tomers@tomers.co.il)
  Post #: 6
RE: Global Port Redirection - 19.Dec.2006 12:35:37 AM   
tomers@tomers.co.il

 

Posts: 41
Joined: 1.Nov.2006
Status: offline
Hi Adrian.

I want to acomplish the following goal:
I have different clients inside my network, which I don't have control of.
Some of the clients try to connect to different SMTP servers on the internet in order to send emails. I want to redirect those clients to a specific SMTP server inside my network without changing any configuration on their PC's.
Even if they will try to connect to a SMTP server on the external, I want the ISA to redirect them to my chosen SMTP server inside the network.
It means that ISA will have to redirect all SMTP traffic from PC's, regardless of the address they tried to connect to.
Am I understood ?

_____________________________

Tomer Schwaitzer
MCT, MCSA, MCSE, CCNA

(in reply to Guest)
Post #: 7
RE: Global Port Redirection - 19.Dec.2006 4:01:44 AM   
Guest
Loud and clear mate!
Unfortunetely you can't do that!
You can do a redirection to specific servers based on clients IP addresses but this
redirection only applies if the request will come for the IP addresses ISA is
listening to it(the addresses bound to that interface).

From ISA help:
quote:

The listener network, or networks, that you select depend on the networks from which clients will connect to the published server. For example, if the service you are publishing accepts client requests from the Internet (External network), you should select the External network for the listener. By selecting the External network, you are selecting the IP addresses on the ISA Server computer that are associated with the External network adapter. If you do not limit the IP addresses, all IP addresses associated with the selected network adapter will be included in the listener configuration.

(in reply to tomers@tomers.co.il)
  Post #: 8

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