define host {
    use         generic-host
    host_name   R11
    alias       R11
    address     10.1.254.1
}

define host {
    use         generic-host
    host_name   R21
    alias       R21
    address     10.2.254.1
}

define host {
    use         generic-host
    host_name   R31
    alias       R31
    address     10.3.254.1
}

define host {
    use         generic-host
    host_name   R41
    alias       R41
    address     10.4.254.1
}
define host {
    use         generic-host
    host_name   R12
    alias       R12
    address     10.1.254.2
}

define host {
    use         generic-host
    host_name   R22
    alias       R22
    address     10.2.254.2
}

define host {
    use         generic-host
    host_name   R32
    alias       R32
    address     10.3.254.2
}

define host {
    use         generic-host
    host_name   R42
    alias       R42
    address     10.4.254.2
}



define host {
    use         generic-host
    host_name   R13
    alias       R13
    address     10.1.254.3
}

define host {
    use         generic-host
    host_name   R23
    alias       R23
    address     10.2.254.3
}

define host {
    use         generic-host
    host_name   R33
    alias       R33
    address     10.3.254.3
}

define host {
    use         generic-host
    host_name   R43
    alias       R43
    address     10.4.254.3
}

define host {
    use         generic-host
    host_name   ISPLOOPBACK
    alias       ISP LOOPBACK
    address     5.5.5.5
}