Setting up a multihomed server.

Discussion in 'MCSA' started by Alex Walker, Mar 14, 2007.

  1. Alex Walker

    Alex Walker Guest

    Cut and pasted from another forum, so please excuse the fomat of this
    query. I'm having trouble setting up a multihomed machine as part of my
    70-291 prep. Can anybody see where I'm going wrong?

    TIA, once again.

    Alex.

    --
    I'm adding a second NIC to my home Win2003 Server so I can create a
    separate subnet in order to help me with preparation for 70-291. I've
    physically added the card and ensured that drivers have been installed
    correctly. I've assigned it the static IP address of 192.168.2.2/24 (the
    original card is 192.168.1.2/24), which I can ping.

    The machine has been configured as a DC, a DHCP Server (It is
    successfully serving up IP addresses via the first interface to other
    machines on the network, and I've configured a scope with a second scope
    for the 192.168.2.x range with an exclusion for .2), and enabled RRAS
    and LAN routing options. I've added the second interface, but I'm having
    a little bit of trouble setting up the second subnet itself if that
    makes sense.

    At the moment the machine doesn't seem to realise that is needs to act
    as a default gateway for the second subnet (this will contain one PC
    already joined to the domain and running XP for test purposes, which I
    haven't physically connected yet), rather than just having a second NIC
    with an assigned IP. Would I do this through adding static routes, or is
    there something else obvious that I've missed?

    --

    Update time. I've taken the DHCP server out of the equation for now,
    given the XP machine on the second subnet an IP of 192.168.1.3, and
    connected it to the second NIC on the router. I can ping 192.168.2.2
    (the second NIC card) from the W2003 machine, but not the XP machine,
    which can ping it's own static address. I've also added routes for both
    the 192.168.1.x and 192.168.2.x subnets, and included a copy of my
    routing table below (192.168.1.1 is the default gateway to t'internet
    via my ADSL router). If I plug the XP machine into the router and give
    it an IP address on the 192.168.1.x network it can see the net, so it's
    got to be a problem with the NIC on the server. I don't understand why
    2.2 pings from the server and not from the workstation. Both NIC cards
    and cabling have been tested and are functional, so I don't believe it's
    a hardware or drivers problem.

    C:\Documents and Settings\Alex>route print

    IPv4 Route Table
    ===========================================================================
    Interface List
    0x1 ........................... MS TCP Loopback interface
    0x2 ...00 60 08 3a 76 d4 ...... 3Com 3C905TX-based Ethernet Adapter
    (Generic)
    0x3 ...00 50 04 70 aa 0c ...... 3Com EtherLink XL 10/100 PCI TX NIC
    (3C905B-TX)
    ===========================================================================
    ===========================================================================
    Active Routes:
    Network Destination Netmask Gateway Interface Metric
    0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.2 1
    127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
    192.168.1.0 255.255.255.0 192.168.1.2 192.168.1.2 1
    192.168.1.2 255.255.255.255 127.0.0.1 127.0.0.1 1
    192.168.1.255 255.255.255.255 192.168.1.2 192.168.1.2 1
    192.168.2.0 255.255.255.0 192.168.2.2 192.168.2.2 1
    192.168.2.2 255.255.255.255 127.0.0.1 127.0.0.1 1
    192.168.2.255 255.255.255.255 192.168.2.2 192.168.2.2 1
    224.0.0.0 240.0.0.0 192.168.1.2 192.168.1.2 1
    224.0.0.0 240.0.0.0 192.168.2.2 192.168.2.2 1
    255.255.255.255 255.255.255.255 192.168.1.2 192.168.1.2 1
    255.255.255.255 255.255.255.255 192.168.2.2 192.168.2.2 1
    Default Gateway: 192.168.1.1
    ===========================================================================
    Persistent Routes:
    Network Address Netmask Gateway Address Metric
    0.0.0.0 0.0.0.0 192.168.1.1 1
    192.168.2.0 255.255.255.0 192.168.2.2 1
     
    Alex Walker, Mar 14, 2007
    #1
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  2. "Alex Walker" wrote:

    > Cut and pasted from another forum, so please excuse the fomat of this
    > query. I'm having trouble setting up a multihomed machine as part of my
    > 70-291 prep. Can anybody see where I'm going wrong?
    >
    > TIA, once again.
    >
    > Alex.
    >
    > --
    > I'm adding a second NIC to my home Win2003 Server so I can create a
    > separate subnet in order to help me with preparation for 70-291. I've
    > physically added the card and ensured that drivers have been installed
    > correctly. I've assigned it the static IP address of 192.168.2.2/24 (the
    > original card is 192.168.1.2/24), which I can ping.
    >
    > The machine has been configured as a DC, a DHCP Server (It is
    > successfully serving up IP addresses via the first interface to other
    > machines on the network, and I've configured a scope with a second scope
    > for the 192.168.2.x range with an exclusion for .2), and enabled RRAS
    > and LAN routing options. I've added the second interface, but I'm having
    > a little bit of trouble setting up the second subnet itself if that
    > makes sense.
    >
    > At the moment the machine doesn't seem to realise that is needs to act
    > as a default gateway for the second subnet (this will contain one PC
    > already joined to the domain and running XP for test purposes, which I
    > haven't physically connected yet), rather than just having a second NIC
    > with an assigned IP. Would I do this through adding static routes, or is
    > there something else obvious that I've missed?
    >
    > --
    >


    By default, a DHCP server can only serve one subnet which it resides on. If
    you want your DHCP server to server more than one subnet, then you have to
    use superscope. Just create a superscope and add the second subnet in it. On
    the scope, configure scope options for gateway and DNS. That should take care
    of the problem.
     
    Dragon Without Wings, Mar 14, 2007
    #2
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  3. Alex Walker

    Alex Walker Guest

    > By default, a DHCP server can only serve one subnet which it resides on. If
    > you want your DHCP server to server more than one subnet, then you have to
    > use superscope. Just create a superscope and add the second subnet in it. On
    > the scope, configure scope options for gateway and DNS. That should take care
    > of the problem.


    Thanks for the response.

    The main problem I have at the moment seems to be the routing itself, as
    the XP machine can't ping the IP of the second NIC card which it's
    directly attached to, even though I can ping the second NIC's IP from
    the server itself.

    I've taken the DHCP server right out of the picture and assigned a
    static IP to the XP Machine until I can deal with this problem first,
    then I'll have another go at assigning IP addresses via DHCP.

    Regards

    Alex.
     
    Alex Walker, Mar 14, 2007
    #3
  4. "Alex Walker" wrote:

    >
    > The main problem I have at the moment seems to be the routing itself, as
    > the XP machine can't ping the IP of the second NIC card which it's
    > directly attached to, even though I can ping the second NIC's IP from
    > the server itself.
    >
    > I've taken the DHCP server right out of the picture and assigned a
    > static IP to the XP Machine until I can deal with this problem first,
    > then I'll have another go at assigning IP addresses via DHCP.
    >
    > Regards
    >
    > Alex.
    >


    Which interface are you using for RAS? For Windows 2003, there is a default
    policy takes place when you turn on RAS which allow only remote connection
    such as PPTP or L2TP. Your local LAN connection is blocked right there. Add
    your local networks to Inbound and Outbound filters should fix the problem.
     
    Dragon Without Wings, Mar 14, 2007
    #4
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