Does iptables support port trigger ?

[Tjlin-林澤君 <tjlin@xxxxxxxxxxxxx>]

Hi 
   I've searched the archives of the port trigger
and iptables , I found some pages that discussed
this issue last year , and it seems the answer of 
my question is "NO" , so I wonder if I can get any
update of my question on this list ?
   Besides , I knew the autofw function of ipvsadm
can meet my requirement , but it is for kernel 2.2,
can I use ipvsadm on kernel 2.4 ?

Thanks for your help !!

bluemot