This might be a little complicated over this forum, but let's give it a shot. You did not say whether this was to go to an ISP, so I will assume such during that is usually the case.
As a rule, you can apply a single valid address for everyone to go to the Internet. You then set up a valid access-list to indicate who can be translated and then any server that needs it's own individual address for acess from the outside needs to be configured. Take a look at the example below.
ip nat pool CSI 18.104.22.168 22.214.171.124 netmask 255.255.255.0
ip nat inside source list 99 pool CSI overload
ip nat inside source list 99 interface serial0 overload
The first allows you to use a pool of addresses for users to use when going out to the Internet.
The second allows you to use the address on the serial interfaces as the one you translate to
for all users instead of using a pool. If you only have a few addresses to use, this allows you
to save as many as possible.
Addresses for servers that need own address for whatever reason, such as an WWW server outside
users will need access to
ip nat inside source static 10.0.1.3 126.96.36.199
ip nat inside source static 10.0.1.4 188.8.131.52
ip nat inside source static 10.0.1.5 184.108.40.206
ip nat inside source static 10.0.1.6 220.127.116.11
ip nat inside source static 10.0.1.2 18.104.22.168
ip nat inside source static 10.0.7.2 22.214.171.124
ip address 10.0.1.1 255.255.255.0
no ip mroute-cache
no ip route-cache
ip nat inside
description T1 to Internet
ip address 126.96.36.199 255.255.255.252
ip nat outside
ip route 0.0.0.0 0.0.0.0 serial0
access-list 99 permit 10.0.0.0 0.0.255.255
The URL that follows will also give you some information on NAT.
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