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Thread: Making computers talk across LAN IP ranges

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    Making computers talk across LAN IP ranges

    Hi there,

    I need some networking advice. Right we have a server on the LAN at, for example IPv4 192.168.0.250, and we have virtual machines that use NAT to access the LAN through the host computer on IPv4 192.168.135.xxx. The server does the DHCP issuing and has itself setup with the range, for example IPv4 192.168.0.100 - 200 with subnet range of 255.255.255.0.

    Now the way that I understand it, I need to change the subnet range so that it can include the NAT VMs, so this would mean that subnet mask would have to be changed to 255.255.120.0?

    Do I have the right of it?

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    Senior Member Blastuk's Avatar
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    Re: Making computers talk across LAN IP ranges

    you can work out which netmask you need by using a calculator
    http://www.subnet-calculator.com/cidr.php

    the ips you stated are pretty far apart and the smallest subnet you can use to make them all in the same network would be 255.255.0.0
    which gives the range of 192.168.0.0 - 192.168.255.255
    192.168.0.0 is the network id
    192.168.255.255 is the broadcast address

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    Re: Making computers talk across LAN IP ranges

    Thanks, I was on the right lines but I didn't know that much about the subnet mask denomination. I don't have much control over what VPC does when you use the NAT feature.

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    Re: Making computers talk across LAN IP ranges

    Will this slow down the network any? Increasing the subnet mask address range to 255.255.0.0 from 255.255.255.0?

  5. #5
    Splash
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    Re: Making computers talk across LAN IP ranges

    Do you *have* to NAT the virtual machines?

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    Re: Making computers talk across LAN IP ranges

    not unless you are filling the network with 1000s of machines, the subnets are divided like that to stop broadcasts being sent to *every* computer as most routers do not allow broadcasts to propagate to other subnets.
    for several computers it's not a real problem.

    what you could do though if you can change away from nat is to use bridged network mode which will give each vpc it's own ip address like a real computer connected to the physical network.

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    Re: Making computers talk across LAN IP ranges

    Quote Originally Posted by Splash View Post
    Do you *have* to NAT the virtual machines?
    Well the reason that I'm doing it is that there seems to be some weird IP clashing going on. I have no static IP addresses on the range, but I'm getting a problem where by the computers are losing a connection to an external server.

    We connect through a router, which has its DHCP functions turned off. A switch is connected to one of the switch ports on the router. DHCP is provided through a Win2K3 server. So to work out if this is a VMs issue, I wanted to move to them onto the NAT based connection rather than on the physical adaptor. So to do that I need to extend the Subnet mask range to include the NAT connected VM devices, as these machines need access to the 2K3 Server which is on the other IP address range.

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    Re: Making computers talk across LAN IP ranges

    Quote Originally Posted by Blastuk View Post
    what you could do though if you can change away from nat is to use bridged network mode which will give each vpc it's own ip address like a real computer connected to the physical network.
    VPC 2007 doesn't seem to offer bridged networking

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    Re: Making computers talk across LAN IP ranges

    so how were the vpcs connected before you switched to nat?

  10. #10
    Splash
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    Re: Making computers talk across LAN IP ranges

    Out of interest what are your reasons for using VPC2007? Is Virtual Server or VMWare Server not an option?

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    Jay
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    Re: Making computers talk across LAN IP ranges

    you could just a add a route
    □ΞVΞ□

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    Re: Making computers talk across LAN IP ranges

    Quote Originally Posted by Splash View Post
    Out of interest what are your reasons for using VPC2007? Is Virtual Server or VMWare Server not an option?
    Because we're a web design firm and need to check things across IE6/7/8b2, Microsoft provide freely available VPC07 images with each of those browsers installed. So if your host machine has IE7 on it then you can download the IE6 and IE8 VMs and be able to test across all IE based browsers.

    As a side note we also test in FF3(PC/MAC)/Safari(PC/MAC)/Google Chrome and Opera, but those four will happily co-exhist o the same machine.

    Quote Originally Posted by Jay View Post
    you could just a add a route
    This I don't understand :S

    Quote Originally Posted by Blastuk View Post
    so how were the vpcs connected before you switched to nat?
    They go directly through the same Ethernet adapter as the host machine but with a different IP address.

  13. #13
    Splash
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    Re: Making computers talk across LAN IP ranges

    Quote Originally Posted by two00lbwaster View Post
    Because we're a web design firm and need to check things across IE6/7/8b2, Microsoft provide freely available VPC07 images with each of those browsers installed. So if your host machine has IE7 on it then you can download the IE6 and IE8 VMs and be able to test across all IE based browsers.

    As a side note we also test in FF3(PC/MAC)/Safari(PC/MAC)/Google Chrome and Opera, but those four will happily co-exhist o the same machine.



    This I don't understand :S



    They go directly through the same Ethernet adapter as the host machine but with a different IP address.
    Is the VPC image format different to Virtual Server (.vhd)?

  14. #14
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      • Memory:
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      • Storage:
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      • Case:
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    Re: Making computers talk across LAN IP ranges

    Quote Originally Posted by Splash View Post
    Is the VPC image format different to Virtual Server (.vhd)?
    There are some minor differences. But, overall, I think that they are broadly compatible.

    The main thing is that these are supposed to be easily accessible quick and easy to use images to check sites in IE browsers. I can't see how setting up a Virtual Server install is going to make it easier for us to all test in the IE browsers compared to the current VPC setup.

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