The second configuration did not work for me as well. I can the interface of the ISP router and get replies but not the loopback of 3.3.3.3
So it seems to be partly working.
the routes seem fine I am using this version of IOS: c3640-jk9s-mz.124-16.bin
here is another pic
if want to see something else I will upload.
I also took wireshark on the interface between ISP and R2.
Now to me that seems to say its getting there correctly from the default route but from my understanding no response found means that it is unable to find its way back. So I tried to change the ip route on ISP to fastethernet 0/0 instead of and IP but that did not work.
I am betting if I changed and added a default route on ISP it would work but not sure that would be a good thing to default route back into the network lol…
