Question

ISA backend with cisco router front

Asked by: Ctechs

Is there example/config of router with ISA server backend.  The external nic on the ISA has to have external ip addresses?

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Asked On
2007-04-21 at 18:42:15ID22526105
Topics

MS Forefront-ISA

,

Networking Hardware Firewalls

,

Network Routers

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: What90Posted on 2007-04-21 at 19:47:42ID: 18953213

Depends on what the final goal is:-)

Have a look at this http://www.isaserver.org/tutorials/2004rightstart.html

You can still avoid having a public Ip address on the ISA if your router does port translation.
This allow external users to access those ISA protected systems. Normally for SMTP and web services.
Check your router type and guide for those details.

 

by: keith_alabasterPosted on 2007-04-22 at 01:01:52ID: 18953611

No, ISA external nic does not need to have Public IP addresses. They just need to be on a different subnet to any used addresses used internally on the LAN side. For example, as long as the router can port-forward or NAT all required inbound traffic targetted for 1.2.3.4 to 192.168.100.1 then all is fine.

  Internet
    |
 1.2.3.4
  router
 192.168.100.1
      |
 192.168.100.2
    ISA
 10.1.5.1
      |
 -------------------- internal networks ---------------


In this scenario, you would need to ensure any public DNS A records or MX records resolved to the 1.2.3.4 address

 

by: CtechsPosted on 2007-04-22 at 01:34:43ID: 18953636

i would do to web publish from the isa backend so the sceenario would be something like this
How would i configure the cisco router?

internet
|
|
fe0/1(x.x.x.x what would this be public ip?)
router
|fe0/1 (x.x.x.x what ip would this be
|
|
external isa nic (80.76.200.2, 80.76.200.1, multiple external ip's)
Isa server
| internal nic (192.168.152.254
|
|
|
internal network

 

by: What90Posted on 2007-04-22 at 08:33:20ID: 18954407

internet
|
|
xDSL( public ip assigned address, multiple external ip's - 80.76.200.2, 80.76.200.1)
router
|fe0/1 (10.1.1.1)
|
|
external isa nic (10.1.1.2, 10.1.1.3)
Isa server
| internal nic (192.168.152.254
|
|
|
internal network192.168.152.x

Then use simple static NAT  on the Router to forward the public addresses to ISA:

Static NAT example on the router
   Public              External ISA     Type
 80.76.200.1 -   10.1.1.2          Web server
 80.76.200.2 -   10.1.1.3           Email Server

20120131-EE-VQP-002

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