root@OpenWrt:/# cat /etc/config/dhcp
config dnsmasq
        option domainneeded     1
        option boguspriv        1
        option filterwin2k      1
        option localise_queries 1
        option expandhosts      1
        option domain           'vexwifi.com.br'
        option authoritative    1
        option readethers       1
        option leasefile        '/tmp/dhcp.leases'
        option resolvfile       '/tmp/resolv.conf.auto'
        option nonwildcard      1
        list interface          br-lan
        list interface          lo
        option dhcphostsfile    '/var/dnsmasq/dhcp-hosts.conf'
        option dhcpscript       '/usr/sbin/dhcp_lease.sh'

config dhcp 'lan'
        option interface        'lan'
        option start            100
        option limit            150
        option leasetime        30m



root@OpenWrt:/# cat /etc/config/network

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config interface 'lan'
        option ifname 'eth0'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.2.1'
        option netmask '255.255.255.0'

config interface 'wan'
        option ifname 'eth1'
        option proto 'dhcp'