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At a minimum, IP routing and
appropriate IP addresses must be configured on the router. To configure
inside global address overloading, perform the following steps:
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Configure dynamic address translation.
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When you define the mapping between the access list
and the IP NAT pool, add the
overload
keyword to the
ip nat inside source list access-list-number pool
name overload
command.
Enable NAT on the appropriate interfaces by using the
ip nat {inside | outside}
command.
The Figure shows a sample address-overloading
configuration and the corresponding topology.
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Lab
Activity |
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Our quickly growing company has the network number 206.222.222.0,
which was assigned by ARIN. Previously the company was using dynamic
address translation over an ISDN line however the company has just
upgraded the line to Frame Relay. The company has been growing and
has outgrown the number of valid IP addresses. The company is not
able to get another class C network from ARIN, so we need to find
another solution which will allow all of our employees Internet
access without over running the available valid IP addresses. We
have researched NAT and found that if set up properly we can
translate many internal IP addresses into one valid IP address. This
is called Overloading Network Address Translation. It is our job to
configure the Frame Relay connection and implement the proper
address translation.
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