Is PF nat broken?

I switched from PPP -nat + IPFW to PF for nat and packet filtering.
It seems to me that nat does not work with pf:
This are my rules in /etc/pf.conf :

ext_if = "tun0"
wifi_if = "rl0"
eth_if = "fxp1"

wifi_net = "192.168.1.0/27"
eth_net = "192.168.0.0/29"

[snip]

nat on $ext_if from $wifi_net to any -> ($ext_if)
nat on $ext_if from $eth_net to any -> ($ext_if)

[snip filtering rules]

In rc.conf I have
gateway_enable="YES"
ppp_enable="YES"
ppp_mode="ddial"
ppp_nat="NO"
ppp_profile="eth"
pf_enable="YES"
pf_rules="/etc/pf.conf"
[snip]

Please note that I'm using pf.ko, not in-kernel support.
There isn't a "nat enable yes" line in /etc/ppp/ppp.conf
Any help will be appreciated.

Best Regards
-- 
Rionda aka Matteo Riondato
GUFI Staff Member (http://www.gufi.org)
FreeSBIE Developer (http://www.freesbie.org)
BSD-FAQ-it Main Developer (http://utenti.gufi.org/~rionda)
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