can someone explain me this scheme ?

[arrbyt]

I

I need to reproduce it and make PC0 ping the google dns but I don't understand how to do it

[balaji.bandi]

This required more information (by Looking at picture we are not sure what is configured)

High level explain :

1. Your 1841 Router connected to Internet Router using Serial Link or DSL

2. Box Router either a Wireless or Router which connected to your 1841 Router

3. PC connected Ethernet or Wireless to your BOX router.

to reach 8.8.8.8

1. your PC should be able to ping the gateway

2. Your 1841 router should be able to do NAT or routing in place.

there is mix of training you can explore and learn :

https://www.youtube.com/watch?v=MXNM7_Kykaw&list=RDCMUCSyUpSE0NC821sUyJ3XOX4Q&start_radio=1&rv=MXNM7_Kykaw&t=58

[arrbyt]

all i know is that the computer has to be in dhcp and that i have to configure the wifi router to have access to an internet from pc0

[balaji.bandi]

yes you need to learn how to configure (or are you expecting someone from the community to configure for you ?.)