Command "Show ip nat translations" doesnt output anything

[Rui Fernandes]

I already tried 2 different ways (2 pictures attached) of configure IP Dynamic NAT and both still doesn't output anything. I saw other posts and I already tried to change the mask to 0.255.255.255 but it still doesn't working. Someone can help?

[Georg Pauwen · Accepted solution]

Hello,

I opened the file, and I think the problem might be that you are trying to ping 193.137.68.2. The only NAT that will happen is when you ping 193.137.68.1, which is the other side of the outside NAT interface. You will not see any NAT entries when you ping 193.137.68.2, because nothing will be translated. The traffic that is being NATted has to go THROUGH the outside interface.

Below are the NAT entries when I ping 193.137.68.1 from various PCs:

Router#sh ip nat translations
Pro Inside global Inside local Outside local Outside global
icmp 193.137.68.2:10 10.11.68.131:10 193.137.68.1:10 193.137.68.1:10
icmp 193.137.68.2:11 10.11.68.131:11 193.137.68.1:11 193.137.68.1:11
icmp 193.137.68.2:12 10.11.68.131:12 193.137.68.1:12 193.137.68.1:12
icmp 193.137.68.2:13 10.11.68.131:13 193.137.68.1:13 193.137.68.1:13
icmp 193.137.68.2:14 10.11.68.131:14 193.137.68.1:14 193.137.68.1:14
icmp 193.137.68.2:15 10.11.68.131:15 193.137.68.1:15 193.137.68.1:15
icmp 193.137.68.2:16 10.11.68.131:16 193.137.68.1:16 193.137.68.1:16
icmp 193.137.68.2:2 10.11.68.131:2 193.137.68.1:2 193.137.68.1:2
icmp 193.137.68.2:3 10.11.68.131:3 193.137.68.1:3 193.137.68.1:3
icmp 193.137.68.2:4 10.11.68.131:4 193.137.68.1:4 193.137.68.1:4
icmp 193.137.68.2:5 10.11.68.131:5 193.137.68.1:5 193.137.68.1:5
icmp 193.137.68.2:6 10.11.68.131:6 193.137.68.1:6 193.137.68.1:6
icmp 193.137.68.2:7 10.11.68.131:7 193.137.68.1:7 193.137.68.1:7
icmp 193.137.68.2:8 10.11.68.131:8 193.137.68.1:8 193.137.68.1:8
icmp 193.137.68.2:9 10.11.68.131:9 193.137.68.1:9 193.137.68.1:9

Router#sh ip nat translations
Pro Inside global Inside local Outside local Outside global
icmp 193.137.68.2:100 10.11.68.131:100 193.137.68.1:100 193.137.68.1:100
icmp 193.137.68.2:101 10.11.68.131:101 193.137.68.1:101 193.137.68.1:101
icmp 193.137.68.2:102 10.11.68.131:102 193.137.68.1:102 193.137.68.1:102
icmp 193.137.68.2:103 10.11.68.131:103 193.137.68.1:103 193.137.68.1:103
icmp 193.137.68.2:104 10.11.68.131:104 193.137.68.1:104 193.137.68.1:104
icmp 193.137.68.2:105 10.11.68.131:105 193.137.68.1:105 193.137.68.1:105
icmp 193.137.68.2:106 10.11.68.131:106 193.137.68.1:106 193.137.68.1:106
icmp 193.137.68.2:107 10.11.68.131:107 193.137.68.1:107 193.137.68.1:107
icmp 193.137.68.2:108 10.11.68.131:108 193.137.68.1:108 193.137.68.1:108
icmp 193.137.68.2:109 10.11.68.131:109 193.137.68.1:109 193.137.68.1:109
icmp 193.137.68.2:110 10.11.68.131:110 193.137.68.1:110 193.137.68.1:110
icmp 193.137.68.2:111 10.11.68.131:111 193.137.68.1:111 193.137.68.1:111
icmp 193.137.68.2:112 10.11.68.131:112 193.137.68.1:112 193.137.68.1:112
icmp 193.137.68.2:113 10.11.68.131:113 193.137.68.1:113 193.137.68.1:113
icmp 193.137.68.2:114 10.11.68.131:114 193.137.68.1:114 193.137.68.1:114
icmp 193.137.68.2:115 10.11.68.131:115 193.137.68.1:115 193.137.68.1:115
icmp 193.137.68.2:116 10.11.68.131:116 193.137.68.1:116 193.137.68.1:116
icmp 193.137.68.2:117 10.11.68.131:117 193.137.68.1:117 193.137.68.1:117
icmp 193.137.68.2:118 10.11.68.131:118 193.137.68.1:118 193.137.68.1:118
icmp 193.137.68.2:119 10.11.68.131:119 193.137.68.1:119 193.137.68.1:119
icmp 193.137.68.2:120 10.11.68.131:120 193.137.68.1:120 193.137.68.1:120
icmp 193.137.68.2:121 10.11.68.131:121 193.137.68.1:121 193.137.68.1:121
icmp 193.137.68.2:122 10.11.68.131:122 193.137.68.1:122 193.137.68.1:122
icmp 193.137.68.2:123 10.11.68.131:123 193.137.68.1:123 193.137.68.1:123
icmp 193.137.68.2:124 10.11.68.131:124 193.137.68.1:124 193.137.68.1:124
icmp 193.137.68.2:125 10.11.68.131:125 193.137.68.1:125 193.137.68.1:125
icmp 193.137.68.2:126 10.11.68.131:126 193.137.68.1:126 193.137.68.1:126
icmp 193.137.68.2:127 10.11.68.131:127 193.137.68.1:127 193.137.68.1:127
icmp 193.137.68.2:128 10.11.68.131:128 193.137.68.1:128 193.137.68.1:128
icmp 193.137.68.2:129 10.11.68.131:129 193.137.68.1:129 193.137.68.1:129
icmp 193.137.68.2:130 10.11.68.131:130 193.137.68.1:130 193.137.68.1:130
icmp 193.137.68.2:131 10.11.68.131:131 193.137.68.1:131 193.137.68.1:131
icmp 193.137.68.2:2 10.11.68.194:2 193.137.68.1:2 193.137.68.1:2
icmp 193.137.68.2:3 10.11.68.194:3 193.137.68.1:3 193.137.68.1:3
icmp 193.137.68.2:4 10.11.68.194:4 193.137.68.1:4 193.137.68.1:4
icmp 193.137.68.2:72 10.11.68.131:72 193.137.68.1:72 193.137.68.1:72
icmp 193.137.68.2:73 10.11.68.131:73 193.137.68.1:73 193.137.68.1:73
icmp 193.137.68.2:74 10.11.68.131:74 193.137.68.1:74 193.137.68.1:74
icmp 193.137.68.2:75 10.11.68.131:75 193.137.68.1:75 193.137.68.1:75
icmp 193.137.68.2:76 10.11.68.131:76 193.137.68.1:76 193.137.68.1:76
icmp 193.137.68.2:77 10.11.68.131:77 193.137.68.1:77 193.137.68.1:77
icmp 193.137.68.2:78 10.11.68.131:78 193.137.68.1:78 193.137.68.1:78
icmp 193.137.68.2:79 10.11.68.131:79 193.137.68.1:79 193.137.68.1:79
icmp 193.137.68.2:80 10.11.68.131:80 193.137.68.1:80 193.137.68.1:80
icmp 193.137.68.2:81 10.11.68.131:81 193.137.68.1:81 193.137.68.1:81
icmp 193.137.68.2:82 10.11.68.131:82 193.137.68.1:82 193.137.68.1:82
icmp 193.137.68.2:83 10.11.68.131:83 193.137.68.1:83 193.137.68.1:83
icmp 193.137.68.2:84 10.11.68.131:84 193.137.68.1:84 193.137.68.1:84
icmp 193.137.68.2:85 10.11.68.131:85 193.137.68.1:85 193.137.68.1:85
icmp 193.137.68.2:86 10.11.68.131:86 193.137.68.1:86 193.137.68.1:86
icmp 193.137.68.2:87 10.11.68.131:87 193.137.68.1:87 193.137.68.1:87
icmp 193.137.68.2:88 10.11.68.131:88 193.137.68.1:88 193.137.68.1:88
icmp 193.137.68.2:89 10.11.68.131:89 193.137.68.1:89 193.137.68.1:89
icmp 193.137.68.2:90 10.11.68.131:90 193.137.68.1:90 193.137.68.1:90
icmp 193.137.68.2:91 10.11.68.131:91 193.137.68.1:91 193.137.68.1:91
icmp 193.137.68.2:92 10.11.68.131:92 193.137.68.1:92 193.137.68.1:92
icmp 193.137.68.2:93 10.11.68.131:93 193.137.68.1:93 193.137.68.1:93
icmp 193.137.68.2:94 10.11.68.131:94 193.137.68.1:94 193.137.68.1:94
icmp 193.137.68.2:95 10.11.68.131:95 193.137.68.1:95 193.137.68.1:95
icmp 193.137.68.2:96 10.11.68.131:96 193.137.68.1:96 193.137.68.1:96
icmp 193.137.68.2:97 10.11.68.131:97 193.137.68.1:97 193.137.68.1:97
icmp 193.137.68.2:98 10.11.68.131:98 193.137.68.1:98 193.137.68.1:98
icmp 193.137.68.2:99 10.11.68.131:99 193.137.68.1:99 193.137.68.1:99

[Rui Fernandes]

It makes perfect sense what I said, now I tried to communicate with the 5 computers with the ISP router and executed the command "show ip nat translastions" in RA and I have the following output

Router#show ip nat translations

Pro Inside global Inside local Outside local Outside global

icmp 193.137.68.2:1024 10.11.68.162:3 193.137.68.1:3 193.137.68.1:1024

icmp 193.137.68.2:1025 10.11.68.196:1 193.137.68.1:1 193.137.68.1:1025

icmp 193.137.68.2:1 10.11.68.131:1 193.137.68.1:1 193.137.68.1:1

icmp 193.137.68.2:3 10.11.68.163:3 193.137.68.1:3 193.137.68.1:3

icmp 193.137.68.2:4 10.11.68.130:4 193.137.68.1:4 193.137.68.1:4

Can I consider it to be right and working well?

[Richard Burts]

Yes you can consider it right and working well. I am glad that we have been able to resolve this issue. It has been a combination of some configuration issues and some confusion about how to test it.  This community is an excellent place to ask questions and to learn about networking. I hope to see you continue to be active in the community.

[Rui Fernandes]

Thanks for your help and for all those who tried to help. It is good to know that there are communities like this and together we can grow. I am currently a university student and I am now learning about networks and it is an interesting area, I hope I can also help other people in the future.

[Richard Burts]

On behalf of the people who have contributed to this discussion I say that you are welcome. When I was starting my career in networking I found a forum much like this one. Participation in that forum was a tremendous help in learning about networking and I really appreciated the people who would share what they knew with me. As I learned more I was able to share what I knew with others. I look forward to seeing that transition in you and wish you well as your career develops.