netflow and NAT

netflow and NAT

hello

this my network :

LAN -[gateway]- DMZ - [firewall] - internet

all traffic is masqued (NAT) in the gateway with 192.168.22.25 (example)
then all traffic is masqued a second time with our public address

i have netflow on the gateway

i see traffic like this :
LAN-192.168.22.25-port 80

so i don't see the public address of the web site

how can i do that (AS ?) ?

for info, i can enable netflow on the firewall