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Place ISA before firewall within same network

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  • Place ISA before firewall within same network

    Basically we’re placing a Cisco firewall between two internal networks and the internet. We currently use ISA for the office network and will like to continue utilizing it for the near future (reports, host header routing, SSL).
    My question is: Can we place ISA between the office network and firewall without creating a separate subnet between ISA and the Cisco firewall or do I have to make a seperate network between them? The access rules are currently setup on both Cisco firewall and ISA to use one subnet and I'd perfer not to have to reset them all.

    Here an image of what I'd like to do.


    Thanks.

  • #2
    Re: Place ISA before firewall within same network

    Add NIC to ISA and do it from there.
    I have 3 networks here.

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    • #3
      Re: Place ISA before firewall within same network

      You need to create a seperate subnets otherwise you got routing problems.
      Marcel
      Technical Consultant
      Netherlands
      http://www.phetios.com
      http://blog.nessus.nl

      MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
      "No matter how secure, there is always the human factor."

      "Enjoy life today, tomorrow may never come."
      "If you're going through hell, keep going. ~Winston Churchill"

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      • #4
        Re: Place ISA before firewall within same network

        Thanks for the insight.

        I was able to get this working by adding a persistent route to the ISA server routing table. The route had all gateway traffic (192.168.100.3) use the connected Interface (192.168.100.1). All other traffic was set to route through the other NIC.

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