We must used the feature DNS rewrite with pix 515E os 7.2.2 but it doesn't work.
I just use this static rule :
static (inside,CAG) 172.21.250.1 184.108.40.206 netmask 255.255.255.255 dns
when i'm connected to dmz cag i make a dns request to dns server in the inside DMZ but the response is 220.127.116.11.
I don't understand because this feature is ok with 6.3.3 Os.
Have you an idea?