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Nat server realizes different ports mapping different intranet addresses

2020-12-16 Published

Network Topology

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.  

Configuration Steps

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.  

  

Key Configuration