Android DNS configuration: use Google Public DNS; file: /system/etc/dhcpcd/dhcpcd-hooks/20-dns.conf; source: - http://blog.varunkumar.me/2010/09/how-to-change-dns-server-on-android.html - http://varun-scratchpad.googlecode.com/svn/trunk/static/20-dns.conf

20-dns.conf

# Set net.<iface>.dnsN properties that contain the
# DNS server addresses given by the DHCP server.

set_dns_props()
{
    case "${new_domain_name_servers}" in
    "")   return 0;;
    esac

    count=1
    for i in 1 2 3 4; do
        setprop dhcp.${interface}.dns${i} ""
    done
    
    count=1
    for dnsaddr in ${new_domain_name_servers}; do
        setprop dhcp.${interface}.dns${count} ${dnsaddr}
        count=$(($count + 1))
    done
	
	setprop dhcp.eth0.dns1 8.8.8.8
	setprop dhcp.eth0.dns2 8.8.8.4
}

unset_dns_props()
{
    for i in 1 2 3 4; do
        setprop dhcp.${interface}.dns${i} ""
    done
}

case "${reason}" in
BOUND|INFORM|REBIND|REBOOT|RENEW|TIMEOUT)       set_dns_props;;
EXPIRE|FAIL|IPV4LL|RELEASE|STOP)                unset_dns_props;;
esac