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Allow and deny class statements in isc-dhcp-server config

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Falk

When allowing one subnet to use a class, do you have to deny "all other subnets" explicitly. Or is it enough to just to allow the class on the subnets that should use that class, and all other are denied by default?

Explicit pseudo config below:

option space CISCO_PNP;
option CISCO_PNP.pnpserver code 43 = string;

# Bind dhcp subnet
subnet 192.168.1.0 netmask 255.255.255.0{
        range 192.168.1.40 192.168.1.40;
        option routers 192.168.1.1;
}

class "ciscopnp" {
  match if option vendor-class-identifier = "ciscopnp";
  option vendor-class-identifier "ciscopnp";
  vendor-option-space CISCO_PNP;
  option CISCO_PNP.pnpserver "5A1N;B2;I192.168.100.6;J80;K4";
}

# PnP
subnet 192.168.242.0 netmask 255.255.255.0 {
  range 192.168.242.2 192.168.242.30;
  option routers 192.168.242.1;
  allow members of "ciscopnp";
}


# No PnP
subnet 192.168.243.0 netmask 255.255.255.0 {
  range 192.168.243.2 192.168.243.30;
  option routers 192.168.243.1;
  deny members of "ciscopnp";
}

-- Regards Falk

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