Multi Site IP Scheme

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  • Hobie
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    #152457

    I am in the process of splitting my network and was hoping for a little more advice.

    I am looking to run my servers from a datacenter (with a small amount of servers at an office location). My users will still be in the Office location.

    I have to build the system while it is in production so I have to build everything local and then move the hosted solution out.


    Hosted:
    Cisco 5510 Router
    Cisco 2960 (24 Port Switch)
    2 VMWare servers (ESXi4.1) on Vsphere Essentials Plus
    1 EMC NX4

    Office:
    Cisco ASA 5505 Router
    DLink 10/100/1000 switch
    1 VMWare server (ESXi4.1)
    1 EMC NX4
    Printers / Desktops / etc. etc.


    Original network: 10.10.111.x (subnet 255.255.255.0)

    After some advice here I think the best route is to run Sites and services and place a DC (or two) in both locations and then route via a Site to Site VPN to have everything under 1 domain.

    My question:
    Does it make sense to increase my subnet and build both networks locally and once I move the networks I would then create the routes and lower the subnet back down?

    — Example —
    Network Prep:
    1) Change subnet to 255.255.0.0
    2) All “office” machines to use 10.10.222.x
    3) All “Hosted” machines to use 10.10.111.x

    Then:
    1) Move hosted machines offsite
    2) create VPN site to site tunnel between sites
    3) change subnets back to 255.255.255.0 via DHCP or static

    My thought is that this will allow the EMC devices to replicate and I would not have to change any IPs for storage arrays, databases, websites, VMs, etc.

    My obvious concern is to limit the chatter between the sites, but we run a small network and I’m not sure of the impact of the subnet over the WAN.

    Thanks for your help!
    Hobie

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