How to setup two subnets on same domain using RRAS

Posted on 2009-04-16
Last Modified: 2012-06-21
I am trying to setup a new subnet on our domain but seem to be having problems. I have attached a jpg showing a basic outline of our network.

On our exsisting netowrk we have win 2k3 running AD DNS and DHCP
Our plan is to setup a subnet of

The RRAS server has AD, DCHP and DNS installed. We wanted to reduce the traffic running through the fibre to the other servers for logons, dhcp and dns.

I have setup a test laptop on the new subnet and it gets its ip from the dhcp server ok. I can ping the server on with no problems and I can also ping its netowrk card on the other subnet But as soon as I try to ping the other servers on the I get nothing.

I have included as much info in the diagram as i can. If I have missed some thing then please let me know and I will try and get it for you.

Thanks for all your help in advance.
Question by:dirtysnipe
    LVL 77

    Expert Comment

    by:Rob Williams
    Try assigning as the default gateway for the laptop and any devices on that LAN, or if you will be adding a default gateway to that subnet you can add a static route to the laptop:
    route add -p mask
    Then you need a return route for the devices on the subnet. You can either add a static route on the local default gateway or on each device/server
    route add -p mask

    Another option is to enable the Rip V2 routing protocol on the RRAS server and on the default gateway, this should automate the routing.
    LVL 4

    Author Comment

    Sorry for the delay getting back.
    Setting a  static route to the laptop would not be a solution as when this subnet goes live it will have over twenty pcs and network printers attached.
    I found that running tracert test to the laptop on the new subnet it was still trying to go off the lan to the internet to find it. After logging into our Inty exo server and adding a static route to the RRAS server all seems to be working ok.
    LVL 77

    Accepted Solution

    Without a static route, the laptop and other PC's will look to it's default gateway for the subnet. That is why it is the "default" route. Thus either that gateway, such as a router, must have the route added, or the RRAS be the default gateway as it knows the subnet by default. The return route must be known by the remote devices as well.

    The simple solution would be to make the default gateway for the new subnet and enable Rip V2 routing on the RRAS box and router/gateway. This allows a dynamic routing table to be built automatically.
    LVL 77

    Expert Comment

    by:Rob Williams
    Thanks dirtysnipe.

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