CCNA #036 NAT Troubleshooting Scenario 2 - Can you find the issue? CCNA Exam 200-125 troubleshooting

Key Takeaways

[Music] this is one of multiple videos discussing network address translation or NAT in this scenario we've been told that devices on the inside of our network such as Rada one acting as PC one router for acting as PC two and rad a five acting as PC three are not able to ping Google in other words 8.8.8.8 in this topology router three is configured as Google so let's do some verification here's Rada one acting as PC one at the top can it paying 8.8.8.8 as we can see in the output it's not able to ping the Google address show IP route we do have a static default route to ten one one two five four which is the IP address of router to acting as our NAT router so let's do a trace to 8.8.8.8 to speed things up I'll type no IP domain lookup do that again so we hit the default gateway but we don't go any further just do that again so trace to 8.8.8.8 it gets to the default gateway which is rotted to you but doesn't get any further so can write it to ping Google paying 8.8.8.8 yes it can it can ping the Google IP address of quadruple eight this is our net router so let's do some net debug so debug IP net press enter that debugging is now enabled paying from Radha 1 to Google we're not getting any output in the nat debug show IP nat translations they are no netted translations show IP net statistics okay so can you find the problem can you see where the issue is in this output notice here total active translations is 0 we had peak translations previously of - and here's the problem there are no outside interfaces they are only inside interfaces gigabit - 0 0 0 1 0 2 and 0 3 are configured as inside interfaces looking at router to use interfaces that's incorrect this interface gigabit is 0 1 is on the outside in other words it's connected to the Internet these three interfaces are on the inside in other words they are on the local LAN and they should be netted so before I do a change let's look at the config this interface is inside according to the configuration this interface is the inside according to the config but according to the topology that should be the outside so that's wrong other interfaces are configured correctly as the inside interface but we need to change gigabit zero 1 and make that the outside interface notice the problem when I hit enter we told that it's inside so no IP net inside IP net outside so we've made it the outside interface now show IP net statistics shows us that gigabit is 0 1 is the outside these three interfaces are inside interfaces some rada one can be ping Google yes we can we can see the natural transition zone router 2 so source IP address of 10111 was translated to 888 to 54 destination being google we got the reply back and the reply was translated so that looks good what about right of 4 and right of 5 acting as internal hosts paying 8.8.8.8 ping succeeds router 5 ping 8.8.8.8 ping succeeds so we've resolved the network address translation issue in this topology don't forget you need to configure inside and outside interfaces correctly when configuring network address translation I hope you found this video useful if it's been a benefit to you please like it and please subscribe to my youtube channel I wish you all the very best [Music]