Transparent UDP redirection

[Jonathan]

Hi all,

I'm trying to temporarily move a radius server from one box to another.
The only problem at the moment is that I tried using portfwd to divert
traffic between the boxes, but it doesn't support transparent proxies
under FreeBSD, so the source address isn't showing up correctly.

Can anyone suggest a port/package that has this feature? I think
ipfw/ipfilter is overkill for this, but I've been wrong before :)

TIA,

Jonathan