ISDN Dialup with PIX 501 problem

[mark.donnellan]

I have a Pix sitting behind an ISDN router

We have a /30 pubic address range. One IP is ssigned to the dialer interface and the other is a static NAT for the mail server.

The router is doing NAT to a private range that the Pix sits in.

When we try to telnet on port 25 to the mail server the pix gives the following error

No translation group found for src x.x.x.x/xxxx to dst x.x.x.x/25

I believe it is a problem with the way NAT is configured

What is the easiest way around this ?

[hbaerten]

If the router is doing the static nat, then the pix doesn't need to do any nat, or does he?

Herbert