RE: External Interface & Multiple IPs

  • From: "Reed, Russ" <Russ.Reed@xxxxxxxxxxxx>
  • To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
  • Date: Thu, 20 Jun 2002 13:04:36 -0500

I want to have one ISP on 1 external interface and another ISP on the 2nd 
external interface. Since I will have 2 public address (one on each  
interface). I will then publish the same internal server on both public 
addresses. Sound reasonable?

-----Original Message-----
From: Chris Burns SRM [mailto:burnsc@xxxxxxxxxx]
Sent: Thursday, June 20, 2002 1:00 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: External Interface & Multiple IPs


http://www.ISAserver.org


Ok, riddle me this then. You can have an external, and internal and a dmz
all with thier own nic's. Isn't the DMZ considered external to the ISA? I
don't really know th eanswer, but do believe I've seen many postings of
people who've done multi-external nics. I presently only have one external,
but have four external IP's assignned to it, and all are doing as thier
supposed to do.

----- Original Message -----
From: "Paul Lemonidis (Hotmail)" <paul_lemonidis@xxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Thursday, June 20, 2002 1:46 PM
Subject: [isalist] RE: External Interface & Multiple IPs


> http://www.ISAserver.org
>
>
> Hi All
>
> I am not certain but I think you can do the following. You assign 2 IP
> addresses to the (one and only) external NIC. Then you can assign 2 IP
> addresses to any internal device you wish to publish. You then publish one
> internal to one external and the other to the other external. I don't
> believe ISA will allow you to publish the same internal IP address to
> multiple external addresses? You would need to add both gateways for the
> external NIC. I don't believe that will be a problem as the routing
> capabilities of the system are clever enough to route the correct traffic
to
> the correct gateway. If not you would need to manually adjust the W2K
> routing table.
>
> If I am mistaken. Many apologies. If anyone knows better then please feel
> free to correct\enlighten us.
>
> Regards,
>
> Paul Lemonidis.
>
>
>
> ----- Original Message -----
> From: "Mark Strangways" <strangconst@xxxxxxxxxx>
> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> Sent: Thursday, June 20, 2002 6:29 PM
> Subject: [isalist] RE: External Interface & Multiple IPs
>
>
> > http://www.ISAserver.org
> >
> >
> > I was always under the understanding that multiple external interfaces
> would
> > not be possible.
> > I believe that there have been some attempts at it, but not successful.
> >
> > Mark S.
> >
> > Correct me if I am wrong Jim / Tom :-)
> > ----- Original Message -----
> > From: "Reed, Russ" <Russ.Reed@xxxxxxxxxxxx>
> > To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> > Sent: Thursday, June 20, 2002 1:22 PM
> > Subject: [isalist] RE: External Interface & Multiple IPs
> >
> >
> > http://www.ISAserver.org
> >
> >
> > I am reviewing Network Interface Configuration documentation in Tom's
> > Book...
> >
> > On the bottom of page 211 it says...
> > "The only interface that should have a default gateway is the external
> > interface of the ISA server. If you have multiple external interfaces
that
> > connect to your ISP(s), you can put in gateways for each of those
> > interfaces."
> >
> > This leads me to believe that you can have multiple external interfaces
> > (NICs). Am I misinterpreting this passage?
> >
> >
> > -----Original Message-----
> > From: Mark Strangways [mailto:strangconst@xxxxxxxxxx]
> > Sent: Thursday, June 20, 2002 12:06 PM
> > To: [ISAserver.org Discussion List]
> > Subject: [isalist] RE: External Interface & Multiple IPs
> >
> >
> > http://www.ISAserver.org
> >
> >
> > No, you can't use 2 external NIC's in the ISA.
> > ----- Original Message -----
> > From: "Reed, Russ" <Russ.Reed@xxxxxxxxxxxx>
> > To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> > Sent: Thursday, June 20, 2002 1:02 PM
> > Subject: [isalist] RE: External Interface & Multiple IPs
> >
> >
> > http://www.ISAserver.org
> >
> >
> > Correction: Can you have more than 1 external interface (I know you can
> have
> > more than 1 IP address).
> >
> > -----Original Message-----
> > From: Reed, Russ
> > Sent: Thursday, June 20, 2002 11:15 AM
> > To: [ISAserver.org Discussion List]
> > Subject: [isalist] External Interface & Multiple IPs
> >
> >
> > http://www.ISAserver.org
> >
> >
> > If I understand ISA correctly, you can only have 1 external IP address?
> >
> > Assuming this is true, any suggestions on how I should configure my ISA
> > server/network for 2 different IP addresses (with 2 different subnets)?
> >
> > Background:
> > We are a small business with a cable modem as our main internet access
(we
> > have 4 public address, only using 1). To provide backup internet access,
> > we are getting wireless internet access (with 1 public IP address). I
need
> > to publish servers (the same internal server) on both external IP
> > addresses.
> >
> > Can I do this with ISA?
> >
> > Russ
> >
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