PF , redirection and NAT-ing question?

[Parvinder Bhasin]

Hi,

I have 2 webservers on my internal lan.  Both have associated EXTERNAL  
IPs.  I setup an OpenBSD box with PF to do firewalling and  
redirection.  Do I also have to put the 2 external IPs on the external  
interface of my PF box as aliases?

If I do put in the aliases and I am also doing NAT-ing on the internal  
lan , would PF  do some kind of round-robin using different  EXTERNAL  
IPs to go out to the net?  I don't want that behaviour.  How can I  
make PF go out on only one pre-determined external IP and not the  
aliases that I am using for the webservers?

Thanks
Parvinder Bhasin