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Thread: Making a school network

  1. #11
    Join Date
    Mar 2013
    Beans
    21

    Re: Making a school network

    Adding this to interfaces on Fred
    Code:
    auto eth0 
    iface eth0 inet static   
    address 192.168.0.250   
    netmask 255.255.255.0
    In an attempt to put both machines in the same subnet now gives me "host unreachable" - which seems to be a vast improvement to previous(nothing at all)

    Have some time this evening so will do some reading. Many thanks for your help so far

  2. #12
    Join Date
    Mar 2013
    Beans
    21

    Re: Making a school network

    In an attempt to put both machines in the same subnet I tried
    Code:
    auto eth0
    iface eth0 inet static
    address 192.168.0.250
    netmask 255.255.255.0
    Pinging VLE from Fred now gives the response
    response from 192.168.0.254 destination host unreachable
    Which seems to be a vast improvement.

    Have some time this eveing so I will do some reading.
    Thanks for your help so far

  3. #13
    Join Date
    Mar 2013
    Beans
    21

    Re: Making a school network

    VLE
    ip 192.168.0.254
    sn 255.255.255.0


    Class C Natural mask = 255.255.255.0
    So, if I am using this. The subnet is a logical AND between ip and subnet mask
    VLE
    ip 11000000.10101000.00000000.11111110 = 192.168.0.254
    sm 11111111.11111111.11111111.11110000
    sn 11000000.10101000.00000000.11110000 = 192.168.0.240


    Fred
    ip 192.168.0.250
    sn 255.255.255.0


    ip 11000000.10101000.00000000.11111010 = 192.168.0.250
    sm 11111111.11111111.11111111.11110000
    sn 11000000.10101000.00000000.11110000 = 192.168.0.240


    So these two machines are in the same subnet?
    So, ping should work? Cant test this until I get back to work but I will investigate why destination host is unreachable and ask further questions later ...




    Anyway, planning things further, I am going to have .. lets call them zones. I am going to have 6 zones (I think)


    VLE Zone
    This is a proper enterprise server, will be LDAP / Kerberus / internet gateway / email and moodle server to my computing network on eth1 and moodle server to the school network on eth0.


    Fred Zone
    Purely experimental LTSP server on an ancient PC while I try to get my head around what's going on...


    Lovelace Zone
    Doesnt exist yet, will be an LTSP server built on a reasonably high spec computer in a classroom for berry terminals and 'gateway'(?) for a few Edubuntu PC's for occasions where a r-pi based thin client is not enough (such as video editing)


    Emeagwali Zone
    As above


    Turing Zone
    As above


    Berners-Lee zone
    Wont exist for some time but will eventually become another network. As above except an unused network is already in existence here.


    So, I will need to create 6 subnets?


    Anyway ...


    Can I configure my subnet mask to allow up to eight subnets by using the subnet mask 255.255.255.224 instead of 255.255.255.0?


    11111111.11111111.11111111.11100000 is /27 bits set with each subnet having 32 host addresses / 30 use-able. There are 30 work places in a classroom.


    VLE
    ip 11000000.10101000.00000000.11111110 = 192.168.0.254
    sm 11111111.11111111.11111111.11100000
    sn 11000000.10101000.00000000.11111100 = 192.168.0.252


    Fred
    ip 11000000.10101000.00000000.11111010 = 192.168.0.250
    sm 11111111.11111111.11111111.11100000
    sn 11000000.10101000.00000000.11100000 = 192.168.0.224


    Hmmm, different subnets. Where to from here?
    Does this mean I will need routers rather than switches between each room / zone? What would be a suitable router, all my searches yield ADSL etc routers which I don't think I am after.


    Most "machines" will be r-pi berryterminals. Do they count? (ie. does a thin client have an independent ip address?) Can I have 30 berryterminals, 5 or 6 PC's and a few more R-Pi's running their native Raspbian that students can use to make small scale web-servers, wifi robots etc?


    My brain is beginning to ache a little bit. Time for beer and food.
    Last edited by morphyrichards1; March 14th, 2013 at 09:30 PM.

  4. #14
    Join Date
    Mar 2013
    Beans
    21

    Re: Making a school network

    Hmmm ... To access it's own subnet and the wider network, each server (Fred, Lovelace, et al) also needs 2 network interfaces? Then it's also able to act as a router? And I need to get my head around iptables too.Is there anything else?(I need to buy the Linux Networking Cookbook)

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