The ethernet cable is connected to ethernet 0 in my cisco 2621.
Router Ethernet 1 is directly connected to ethernet 0 (outside) of my pix 506E
Pix's ethernet 1 (inside) is connected to my backbone switch 3550 over a dedicated port VLAN
The pix is configured with nat.
My ISP gave me 6 external internet addresses. (/48)
One is given to the cable modem (configured remotely by the ISP)
one is given to the (external) ethernet 0 of the router
one is given to outside of the pix.
The problem is how to configure the router's interfaces since I don't want to configure nat between its interfaces and the (internal) ethernet 1 connected to the pix should be an internet address like ethernet 0.
I am little unclear about the whole setup. Can you please elaborate with respect to the ip addresses? Your ISP has given you 6 ip addresses one is assigned to the e0 of the router. What is the ip address you are using for e1 of the router?