root@rtr-1:/opt/vyatta/sbin# diff -u vyatta-dns-forwarding.pl.ORIG vyatta-dns-forwarding.pl
--- vyatta-dns-forwarding.pl.ORIG       2010-02-28 23:44:40.000000000 -0800
+++ vyatta-dns-forwarding.pl    2010-02-28 23:44:59.000000000 -0800
@@ -137,6 +137,8 @@
         $output .= "resolv-file=/etc/dnsmasq.conf\n";
     }
 
+    $output .= "conf-file=/etc/dnsmasq.more.conf\n"; 
+
     return $output;
 }


###########################

# cat /etc/dnsmasq.more.conf 
enable-tftp
tftp-root=/var/lib/tftpboot
dhcp-boot=pxelinux.0 

To fill /var/lib/tftpboot

http://www.howtoforge.com/install-multiple-linux-distributions-via-pxe-the-easy-way