ASA/PIX does not allow secondary IP address on the interface like the routers.
You can add/use this new block of addresses as globals and static as usual on the firewall. Just like the ones that you have. The question is which route will the packets take? You can only have one default route pointing to one interface. Will both the ISPs route for both blocks of IPs?
What is the reason for dual ISP? Load Balance or redundancy?
If it is load balance you need another layer 3 device like a router and you can do PBR on that.
This has been discussed previously in the following thread:
Thanks for the answer... Oh let me clarify the two IP address blocks are from one ISP. I have contacted them already and the PE router is ready to route both IP address blocks. So, I think what you are suggesting is to add another global command with the new IP address block and then just add static for the 'one to one' translation... using the new IP address block range... right ? and of course the appropiate acl statements as well.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...