pfsync advice

[Ismail OZATAY]

Hi all,

I am planning to replace my current openbsd cluster pf firewall 
hardwares which has 4 ethernet with new embedded hardwares. As you know 
I use one of these interfaces for pfsync . But new embedded hardwares 
have 3 ethernet. I thought that I need one more ethernet for pfsync but 
it is impossible to add because does not have any pci or pci-x slot 
more. I am wondering that can i use rs232 ports back-to-back for pfsync 
dev or how can use these hardwares ?

Regards

Ismail