classing gateway

Simon Hobson dhcp1 at thehobsons.co.uk
Thu Dec 16 13:59:26 UTC 2010


marco perugini wrote:

>my dhcp server [which is 192.168.0.110] can receive DHCPDISCOVER 
>from two different gateways [192.168.98.101 and 192.168.2.101]. i've 
>some entire subnets to assign to 98.101's requests and other entire 
>subnets to assign to 2.101's requests. so the only feature i'm 
>trying to achieve is to differentiate who's asking me for an addr.
>i thought something like that:
>
>shared-network "98.101" {
>         allow unknown-clients;
>         deny duplicates;
>
># gw1 subnet
>         subnet 192.168.98.0 netmask 255.255.255.0 {
>         }
># my subnet
>         subnet 192.168.0.0 netmask 255.255.255.0 {
>         }
># to assign subnet
>         subnet 178.45.23.0 netmask 255.255.255.0 {
>                 option subnet-mask 255.255.255.255;
>                 option broadcast-address 178.45.23.255;
>                 option routers 178.45.23.1;
>                 range 178.45.23.2 178.45.23.254;
>         }
>}
>shared-network "2.101" {
>         allow unknown-clients;
>         deny duplicates;
>
># gw1 subnet
>         subnet 192.168.2.0 netmask 255.255.255.0 {
>         }
># my subnet
>         subnet 192.168.0.0 netmask 255.255.255.0 {
>         }
># to assign subnet
>         subnet 178.48.11.0 netmask 255.255.255.0 {
>                 option subnet-mask 255.255.255.255;
>                 option broadcast-address 178.48.11.255;
>                 option routers 178.48.11.1;
>                 range 178.48.11.2 178.48.11.254;
>         }
>}

Close, but 192.168.0.0 must **NOT** be in the shared-network 
statements. It is on a separate network according to your description.

And don't forget that all the clients must be able to route packets 
to/from the server - when they renew their leases, it is done by 
unicast packets.

-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
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