The public network equipment is used as a nat server and uses the same public network ip, requiring different port numbers to be converted into different inside addresses.
Method 1:
nat static outbound 3.3.3.3 1.1.1.1
interface GigabitEthernet2/0/4
nat server protocol tcp global 1.1.1.1 10000 inside 2.2.2.2 80
nat static enable
Method 2:
acl advanced 3003
rule 0 permit tcp source 1.1.1.1 0 source-port eq 10000
acl advanced 3004
rule 0 permit tcp source 1.1.1.1 0 source-port neq 10000
interface GigabitEthernet2/0/4
nat server global 3003 inside 2.2.2.2 80
nat server global 3004 inside 3.3.3.3
Method 3:
interface GigabitEthernet2/0/4
nat server protocol tcp global 1.1.1.1 1000 inside 2.2.2.2 80
nat server protocol tcp global 1.1.1.1 1 999 inside 3.3.3.3 1 999
If too many ports are configured, there will be a prompt similar to the following.
Maximum number of global ports (10000) already reached.