NethServer 6

Tested solution

Create a template custom /etc/e-smith/templates-custom/etc/dnsmasq.conf/30dhcp with the following content:

#
# 30dhcp
#

# Enable the DHCP server. Addresses will be given out from the range
# <start-addr> to <end-addr> and from statically defined addresses
# given in dhcp-host options. 
# See db configuration getprop dnsmasq DhcpStatus

{
    use NetAddr::IP;
    my $db = esmith::ConfigDB->open_ro("dhcp") || die "Can't open dhcp database: $!\n";
    my $ndb = esmith::NetworksDB->open_ro() || die "Can't open networks database: $!\n";
    my $tot_range_length = 0;
    foreach ($db->get_all_by_prop("type" => "range")) {
        my $status = $_->prop('status') || 'disabled';
        if ( $status eq 'enabled') {
            my $interface = $_->key;
            my $start = $_->prop('DhcpRangeStart') || next;
            my $end = $_->prop('DhcpRangeEnd') || next;
            my $start_ip = new NetAddr::IP($start);
            my $end_ip = new NetAddr::IP($end);
            my $range_length = $end_ip->numeric - $start_ip->numeric;
            $tot_range_length += $range_length;
            my $lease = $_->prop('DhcpLeaseTime') || '86400';
            $OUT .= 'dhcp-range=' . join(',',$_->key,$start,$end,$lease) . "\n";

            my $domain = $_->prop('DhcpDomain') || '';
            if ($domain ne '') {
                $OUT .= 'domain=' . join(',',$domain,$start,$end) . "\n";
            }

            # Send router configuration to clients
            my $router = $_->prop('DhcpGatewayIP') || '';
            if ($router eq '') {
                my $i = $ndb->get($_->key);
                if ($ndb->red()) {
                    $router = $i->prop('ipaddr');
                } else {
                    $router = $i->prop('gateway') || $i->prop('ipaddr');
                }
            }
            if ($router) {
               $OUT .= "dhcp-option=".$_->key.",option:router,$router\n";
            } else {
               $OUT .= "# dhcp-option=".$_->key.",option:router,<UNDEFINED>";
            }

            my $dns_server = $_->prop('DhcpDNS') || '';
            if ($dns_server ne '') {
               $OUT .= "dhcp-option=$interface,option:dns-server,$dns_server\n";
            }

            my $ntp_server = $_->prop('DhcpNTP') || '';
            if ($ntp_server ne '') {
               foreach (split(',',$ntp_server)) {
                   $OUT .= "dhcp-option=$interface,option:ntp-server,$_\n";
               }
            }

            my $wins_server = $_->prop('DhcpWINS') || '';
            if ($wins_server ne '') {
               foreach (split(',',$wins_server)) {
                   $OUT .= "dhcp-option=$interface,44,$_ # WINS\n";
               }
            }

            my $tftp_server = $_->prop('DhcpTFTP') || '';
            if ($tftp_server ne '') {
               foreach (split(',',$tftp_server)) {
                   $OUT .= "dhcp-option=$interface,66,$_ # TFTP\n";
               }
            }

        } else {
            $OUT .= "\n# DHCP disabled on ".$_->key."\n";
        } 
    }
    if ($tot_range_length > 0) {
        use esmith::HostsDB;
        my $hdb = esmith::HostsDB->open_ro() || die "Can't open hosts database: $!\n";
        foreach ($hdb->get_all_by_prop('type' => 'local')) {
            $_->prop('MacAddress') || next;
            $tot_range_length++;
        }
        $OUT .= "dhcp-lease-max=$tot_range_length\n";
    }
}

# Should be set when dnsmasq is definitely the only DHCP server on a
# network.
dhcp-authoritative

# Read dhcp reservations from dhcp-hostsfile. 
# See dhcp-hosts option for more informations.
dhcp-hostsfile=/etc/dnsmasq-dhcp-hosts

Thanks to LucentW for the patch.

• nethserver-dnsmasq-1.5.1-1.4.gad339b1.ns6.noarch.rpm

• Check the bug is not reproducible

System and Package Version installed
HP Microserver N40L - Nethserver 6.6 fully updated
Package Installed: nethserver-dnsmasq-1.5.1-1.ns6.noarch
Other Package installed: Bandwidth monitor,Basic firewall,DNS and DHCP server.Intrusion Prevention,System,POP3 proxy,SMTP proxy,Statistics,UPS support,VPN,Web filter,Web proxy,Web server

Test Original Problem
Bug confirmed, only one dns server is assigned to client

Install Updated Package

yum update --enablerepo=nethserver-testing nethserver-dnsmasq-1.5.1-1.4.gad339b1.ns6

Test Results after install
Test case 1:
configure 2 dns in advanced option of dhcp settings.
Ok on Windows10/Linux(Fedora22)/Mac(10.10.4)

Test case 2:
configure 3 dns in advanced option of dhcp settings.
Ok on Windows10/Linux(Fedora22)/Mac(10.10.4)

Verified or Reopen
Verified

Note
tested only on eth0 -Green network

In nethserver-base/6.7:

nethserver-dnsmasq-1.5.3-1.ns6.noarch.rpm