We have a Cisco ASA 5505; we have just upgraded our internet service with Comcast and with the information they have sent me, I'm not sure how i would configure our ASA with the two different subnets on the outside interface.
This is what they have sent:
Interconnect block – 220.127.116.11/30
Comcast Internet gateway: .97
Customer’s WAN interface: .98
Primary DNS: 18.104.22.168 Secondary DNS: 22.214.171.124
Customer’s useable IP block – 126.96.36.199/28
Usable IPs: 188.8.131.52 thru .126
The /28 of usable IP space is statically routed by Comcast to 184.108.40.206
Could someone please suggest how i would best go about this?
You can't have both simultaneously handling your traffic. The closest you can do directly on the ASA is to have one path as a backup route which only takes over when the first is not seen. Reference. (old guide but still valid)
Otherwise you need to use an upstream router.
I read your post completely different then Marvin ... It seems that you just got a second subnet so that you have more usable addresses? And your outside IP is 220.127.116.11? Then you can either use that new subnet as a DMZ-interface on the ASA, or you can use the addresses of this new range as public NAT-objects for incoming and outgoing traffic.