Advice Needed re: Best Setup for Two Organizations Sharing Single

Discussion in 'Windows Small Business Server' started by SteveS, Nov 10, 2007.

  1. SteveS

    SteveS Guest

    Hi There,

    I have just acquired a new client that is a non-profit (5 x WinXP desktops)
    sharing office space with a church. The church is not my client although I
    hope it might be at some point in the future. Both share a single DSL
    connection. Both are currenly running peer to peer with no central file
    management or server etc. Staff at the non profit are frustrated and ready to
    move to a server based network. I don't see a problem with the non-profit
    having an SBS server on their own and the church continuing to be peer to
    peer (single DNS and DHCP server) but what happens down the road if the
    church decides to get SBS as well.

    - I am assuming two SBS can't exist in the same subnet even with different
    domains ... can someone verify this?

    - If two SBS servers can't co-exist in same subnet can two regular Windows
    2003 Servers exist (non-profit is using Act and won't really need Exchange)
    or can I have one SBS server in one domain and one Win 2003 Server in another

    - Has anyone tried adding two additional routers in a Y configuration so
    they each have their own subnet (they use VPN which might make this a
    challenge) but still share internet connection

    - Any other suggestions would be appreciated.


    SteveS, Nov 10, 2007
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  2. As long as you set them up on two isolated LAN subnets (which shouldn't be
    difficult if you have more than one static IP) this is a cinch - and
    protects each network from the other.
    I think this will cause problems, but I haven't tried it, honestly.
    Yes, but it's still insecure & might lead to other problems. I'd try to
    avoid it if possible, as they aren't actually the same "company".
    Yes. You need more than one public IP address from the DSL provider to make
    this work right, tho -


    *ISP's modem*
    |-----Ethernet switch-----|
    | |
    ( (
    *RouterA* *RouterB*
    | |
    |----LANA----| |----LANB----|

    Lanwench [MVP - Exchange], Nov 10, 2007
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  3. One acronym - DHCP.

    Yeah, it'll have problems. But if you dual NIC one or both of them, you get
    them out of the problem. Just make sure they're on different physical
    segments on the LAN side. Set your DSL up in bridge mode, to a hub/switch.
    The multiple fixed IPs solves the public side.

    Or, as you suggest, two routers on the downstream side of the switch.
    Actually, that way you _could_ run single NIC, if that's your preference.
    Charlie Russel - MVP, Nov 10, 2007
  4. Ah, yes, there is that. Of course, the workgroup computers could very easily
    pick up their IP addresses from the SBS box and work that way, but this is a
    good point. Even though it's an abbreviation and not an acronym ;-)
    Presuming there are two - if it's cheapo residential ADSL, may not be....
    That's always my preference. ;-)
    Lanwench [MVP - Exchange], Nov 10, 2007
  5. My residential ADSL lets me buy fixed IPs. I have 1 fixed, and the higher
    bandwidth option on ADSL lets me have up to five floating. I use
    DirectUpdate when I need to plug something in to one of the floating ones to
    test against. (My _real_ SBS box uses the fixed, along with a fixed on the
    cable, running through a Dual WAN Xincom router.)
    And never mine. ;) But then, I run Premium just so I can have ISA.

    Charlie Russel - MVP, Nov 10, 2007
  6. Cool beans.
    I install SBS mainly so I can get Exchange into small offices ;-)
    Lanwench [MVP - Exchange], Nov 10, 2007
  7. SteveS

    SteveS Guest

    Thanks. I hadn't even thought about getting 2 static IP's. The diagram below
    is very helpful.

    They are currently with Bell Canada DSL (not sure they can get 2 IP's) but
    they are too far from dslam and get poor service so we may be switching to
    Rogers Cable and I know they offer up to 5 IP's.
    SteveS, Nov 10, 2007
  8. SteveS

    SteveS Guest

    Thanks Charlie I hadn't thought of dual NICS as an option.
    SteveS, Nov 10, 2007
  9. A thought...

    Dual NICs are good for isolating the SBS servers from each other, but if you
    only have a single WAN IP address, both SBS servers may not be able to
    participate in all the features of externally accessing SBS. Certain ports
    are "hardcoded" in to the Windows OS and can't be changed. Therefore, in
    the router you can forward to the external NIC on only one SBS server. An
    example of ports that can't be changed are 1723 (VPN) and 443 (SSL -
    although there may be ways to get aroud this one). Ports 4125 (RWW), 3389
    (Terminal Services/RDP), 25 (Exchange) can be changed but I've never had to
    do this for a dual SBS setup. Could be interesting.
    Merv Porter [SBS-MVP], Nov 10, 2007
  10. What would your non-profit say to a suggestion 'OK, you guys are buying a
    server, how about we let the church piggy back along on it?'.

    Setting up a single SBS, say SBS.StMarks.local then having it look after
    email for _and_ would be less complicated than the
    other scenarios, and in the long term provide a less expensive and less
    complex environment to both. Of course, there would need to be discussions,
    information/resource sharing, what happens if they separate? Possibly many

    just a thought.
    SuperGumby [SBS MVP], Nov 10, 2007
  11. Charlie Russel - MVP, Nov 11, 2007
  12. Yeah....that's crazy talk !
    Lanwench [MVP - Exchange], Nov 11, 2007
  13. I *think* I like SG's suggestion the best. Email can be controlled with
    recipient policies or default SMTP settings, the rest is trust that folders
    are kept separate so that Church_Payroll.xls is not open to Not for Profit
    Susan, and vice versa.

    OTOH, if two IP's could be had from the ISP this really simplfies things. I
    have more than one location where there are two SBS servers sharing one inet
    connection (fractional T1) where there are 5 ip's available. This leaves
    three or more for web cams or the like.
    Larry Struckmeyer, Nov 13, 2007
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