New Typ of Firewall Config (for me)
Posted on 2012-09-19
OK - this is a different type of config for me so I am reaching out for some advise / help. I manage many cisco asa 5520's and I am in the process of converting one asa from a block of 30 outside addresses of to a 50 Meg Cox cable modem with a block of 30 cidr addresses.
Normally I would just reference an outside address and bingo, things would work right. In this case I found out so far that I could only get internet access through this cable modem by setting up the outside interface of the asa with dhcp - then it grabbed a public wan address, added a route to the asa 5520 and then I had internet access out through the cable modem.
My question / problem / nuance to me is when I reference / assign one of our cidr addresses to a device (like a server) and that is natted from the dmz to the outside address I don't get access to the device.
I'm thinking I have to do something special to set up these cidr addresses but having never done this before I am reaching out for some advise.
my outside dhcp assigned wan address is 70.168.x.1xx with a gateway of 70.168.x.1
The cidr block I have been assigned from the cable company is
The cable company also has suggested a default gateway address withing the cidr block and a first useable and last useable address.
I must say that I usually look to over complicate things by thinking things are more difficult than they really are.
Can anyone get me pointed in the right direction so I know how to assign these cidr addresses and have then accessable from the outside???
Thanks in advance