I've just got a new Internet Access line installed from my ISP. I need 6 public IP addresses, and therefore the ISP has assigned me a /30 and a /29 range.
/30 subnet is between my FW outside interface and ISP edge router.
/29 subnet is from the ISP static routed to my FW outside IP address.
But since I only has one FW right now (a ASA 5505) i cannot see how i can route the /29 subnet.
If i has two ASA 5505 i could use the /29 subnet as a DMZ network between the two firewalls, and direcly connect hosts that would need a public ip to this DMZ network. But is it possible to use it with only one firewall, and some how make a 1:1 NAT to internally hosts that would need a public ip (not just overload PAT of the outside interface)
You should be able to use the second Public Subnet /29 just fine on the ASA since the ISP has routed it towards your ASA outside IP address.
You can configure NAT configuration using the /29 address range on the ASA "outside" interface normally even though the IP addresses used dont belong to the subnet connected to the "outside" interface.