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I have configured what I think is Static Nat on my "NAT Router". I have attached an image of my network topology.

However when I test the connection between the server on the inside network and the agent PC on the outside network it seems something regarding the NAT seems to be wrong as it won't access with the nat address?

I do need to set a NAT router statement to accept and rout any IP from the internet with any subnet mask to (FA0/1) which im struggling with, because this isn't set up could this be why? Does anyone know how I would implement this?

This is the coding which I have added for nat

Ronald(config)#ip nat inside source static 172.31.0.100 74.125.20.100 Ronald(config)#inter Ronald(config)#interface fas Ronald(config)#interface fastEthernet 0/1 Ronald(config-if)#ip nat inside Ronald(config-if)#exit Ronald(config)#inter Ronald(config)#interface fa Ronald(config)#interface fastEthernet 0/0 Ronald(config-if)#ip nat outside Ronald(config-if)#exit network

Ronald#show ip nat translation Pro Inside global Inside local Outside local Outside global --- 74.125.20.100 172.31.0.100 --- ---

Router Configurations

Router#config t Router(config)hostname Ronald Ronald(config)#interface FastEthernet0/0 Ronald(config-if)#ip address 74.125.15.2 255.255.255.0 Ronald(config-if)#ip address 74.125.15.2 255.255.255.0 Ronald(config-if)# Ronald(config-if)#exit Ronald(config)#interface FastEthernet0/1 Ronald(config-if)#ip address 74.125.20.1 255.255.255.0 Ronald(config)#ip nat inside source static 172.31.0.100 74.125.20.100 Ronald(config)#inter Ronald(config)#interface fas Ronald(config)#interface fastEthernet 0/1 Ronald(config-if)#ip nat inside Ronald(config-if)#exit Ronald(config)#inter Ronald(config)#interface fa Ronald(config)#interface fastEthernet 0/0 Ronald(config-if)#ip nat outside Ronald(config-if)#exit

  • You can see the NAT status with "show ip nat translation" – Ron Trunk Apr 29 at 14:33
  • it comes up with - Ronald#show ip nat translation Pro Inside global Inside local Outside local Outside global --- 74.125.20.100 172.31.0.100 --- --- (I have updated original post) – Cisly Apr 29 at 14:35
  • NAT seems to be set up correctly. Please edit your question to include the rest of your router configuration so we can see where else things may have gone wrong. – Ron Trunk Apr 29 at 14:37
  • I've noticed the Agent PC wont connect to the NAT Router either, doesn't seem to have a connection but all the configurations are correct from what I can see so it might be a problem there. – Cisly Apr 29 at 14:38
  • please provide configuration of router, no issue with translation – infra Apr 29 at 14:46
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You need to configure Static Route. Ip route 172.31.0.0 255.255.255.0 74.125.15.1 In NAT router. Otherwise Router does not know how to reach to your 172.31.0.0 network

internal router: ip route 0.0.0.0 0.0.0.0 74.125.15.2

  • whenever I try to test this it still says destination host unreachable. Do I need to add any static routes other than the one above? Or do I need to add anything onto the internal router aswell? I've noticed my agent pc is connecting to anything either. im in a big mess ahaha – Cisly Apr 29 at 15:10
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    You probably need a route on your internal router: ip route 0.0.0.0 0.0.0.0 74.125.15.2 – Ron Trunk Apr 29 at 15:15
  • I had typed wrong ip address and just now i edited and @RonTrunk's comment added to my answer to complete it. – infra Apr 29 at 15:32
  • thank you for your assistance! I have now got it all working however the only one that wont communicate successfully is the Agent PC communicating with the web server with the nat address of 74.125.20.100 - is there any clear reasoning for this? – Cisly Apr 29 at 15:46

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