Step 3 The router replaces the inside local source address 1.1.1.1 with the
selected inside global address and forwards the packet.
Step 4 Host B receives the packet and responds to host 1.1.1.1 by using the
inside global IPv4 address 2.2.2.2.
Step 5 When the router receives the packet with the inside global IPv4 address,
the router performs a NAT table lookup. Using the inside global address
and port and outside global address and port as a key, the router translates
the address back into the inside local address 1.1.1.1 and forwards the
packet to host 1.1.1.1. Host 1.1.1.1 receives the packet and continues the
conversation. The router performs Steps 2 through 5 for each packet.
To con?¬?gure overloading of inside global addresses, follow these steps:
Step 1 De?¬?ne a standard ACL that permits the addresses that are to be translated.
RouterX(config)# aacccceessss--lliisstt access-list-number ppeerrmmiitt source [ sourcewildcard]
Enter the no access-list access-list-number global command to remove the ACL.
Step 2 Establish dynamic source translation, specifying the ACL that was
de?¬?ned in the prior step.
RouterX(config)# ip nat inside source list access-list-number interface
interface overload
Enter the no ip nat inside source global command to remove the dynamic source
translation.
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