I have 3 public subnets. I have a situation that is going to require me to NAT 2 public subnets, and not NAT 1.
Of these 2 that will need to be natted, I need to statically NAT a complete subnet to inside addresses.
ip address 188.8.131.52 255.255.255.0
ip address 184.108.40.206 255.255.255.0 sec
ip address 220.127.116.11 255.255.255.0 sec
I've NEVER set up complete pools to be translated before, but I've done one-to-one before. The interesting thing with this is that this router will have a public address on the inside interface because it connects to a public facing switch. It has to nat to the 18.104.22.168 subnet if it's coming from 22.214.171.124 or 126.96.36.199 because the router only knows of the 188.8.131.52 subnet on it's inside interface.
What lines do I need to get this to work? Do I need a NAT pool, or do those only affect outbound traffic?
We have 3 public blocks of IPs from 3 different ISPs. I need to provide a way for people from outside to get to our web servers, mail servers, etc.
The addresses that are on the public interface are routable addresses. The reason that I keep going back to "ip nat outside" is because I'd be expecting traffic coming from the public interface in.
I have one to one mappings because I looked in the fatpipe today, and I noticed that we're doing one-to-one from the other two subnets to the "private" subnet. (It's not a private IP, just on the inside interface.)
So, all translations need to be done from 184.108.40.206 and 220.127.116.11 to an public address on the 18.104.22.168 subnet.
I admit NAT is a bit confusing in terms of inside/outside. If you have the time some day we can through it in details. But suffice to say if you want to present an internal address to the outside then "ip nat inside source static is the way to go.
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