Re: Multiple Internet Sources

From: "Jay" <jschwarzkopf@xxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Date: Tue, 22 Jan 2002 21:23:06 -0500
I know it works.

We've had it running for over 3 months.  The DSL (Speakeasy) has gone down 
several times, and internet traffic switched over to the T1, and then back 
again, when the DSL came back up.  Likewise, when the T1 went down our VPN 
connections, switched over to the DSL.  Of course, you have to script some of 
this (for example change alternate addresses on published Citrix servers and 
add/remove routes on ISA).

But its not turnkey.  You need to do some work.


  ----- Original Message ----- 
  From: Joseph 
  To: [ISAserver.org Discussion List] 
  Sent: Tuesday, January 22, 2002 12:23 PM
  Subject: [isalist] Re: Multiple Internet Sources


  http://www.ISAserver.org


  I always hear that this type of connection won't really work.  Does any one 
else think that this might work?

   

  Thanks,

   

  Joseph

   

  -----Original Message-----
  From: Jay [mailto:jschwarzkopf@xxxxxxxxxx] 
  Sent: Monday, January 21, 2002 10:07 PM
  To: [ISAserver.org Discussion List]
  Subject: [isalist] Re: Multiple Internet Sources

   

  http://www.ISAserver.org

  Using 2 internet connections can be done (without the 3rd nic), but it's not 
pretty:

   

  Put both internet connections into a switch in front of ISA.  

  Add IPs from both schemes to the ISA external interface (primary internet 
connection first)

  Use the primary int connection as the default gateway for the ISA server.

  Dead-gateway detection has problems on ISA, so you have to write script that 
continuously checks status of internet connection, and changes IP, gateway, and 
DNS on external interface.

  You can publish on both external IP's (I've done it with server publishing, I 
assume web pub will work as well), so you do not need to modify ISA publishing 
rules.

   

  You can even load balance (sort of).  If you use a DNS caching server and/or 
SMTP relay server in front of ISA, you can forward that traffic through the 
secondary internet connection. You can even run VPN through the secondary 
connection.  Remember to add persistent routes pointing to the secondary 
internet connection as the gateway for the external servers (DNS/SMTP) and the 
VPN subnets.

   

      ----- Original Message ----- 

      From: Mike Chyril 

      To: [ISAserver.org Discussion List] 

      Sent: Monday, January 21, 2002 07:17

      Subject: [isalist] Multiple Internet Sources

       

      http://www.ISAserver.org

      We are purchased a 10mb fibre connection.. but would still like to use 
our cable internet as a backup.

       

      Is it possible to add a 3rd nic to our ISA box and add the fibre ip's to 
our web/application hosting/publishing?

       

      Anyone done this?

       

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Re: Multiple Internet Sources

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