there's no iptables rule , but my lvs_nat works well, why?

["lu.peng" <lu.peng.louis@xxxxxxx>]

hi, all

        my linux kernel is 2.4.21, after i have patched with LVS, then  i 
download a configure tools(configure-lvs_0.9.4.tar.gz),  i use the 
"lvs_nat.conf.one_NIC_one_network" after customizing to suit my test 
environment, then , it produce a script as "rc.lvs_nat". then i run the script 
in my director and my realservers, then the LVS works very well .
        But he amazing thing is , when i check the iptables rules 
table(iptables -L, iptables -t nat -L, and so on), there is no rule in it? why 
,  how can the lvs achieve nat without the iptables help?
        Can anybody tell me why?

thanks 
louis