How blocks clients (from internet)

[Pol Hallen]

Hi all :-)

I've this config. "option routers" is commented (and also ip-forwarding is
to off), my mobiles instead can connect to internet. How I permanently
blocks all mobiles from internet?). If a client known IP of routers can
use static IP and add also IP of routers to goes to internet. What's the
best way?
Thanks for help!

Pol

subnet 192.168.1.0 netmask 255.255.255.0 {
        range                           192.168.1.150 192.168.1.199;
        max-lease-time                  7200;
        default-lease-time              600;
        option ip-forwarding            off;
        option subnet-mask              255.255.255.0;
        option broadcast-address        192.168.1.255;
        option domain-name-servers      192.168.1.212, 8.8.8.8;
        option netbios-name-servers     192.168.1.212;
#       option routers                  192.168.1.212;
        option ntp-servers              192.168.1.212;
        option domain-search            "example.com";
        ddns-domainname                 "example.com";
        ddns-rev-domainname             "in-addr.arpa";
        option domain-name              "example.com";
        option domain-search            "example.com";
        }