Need some basic static IP route help - Its been a whild

[Michael Durham]

Hello, It has been a few years since I have had the need to connect to a clients network via my Cisco C2901 router and put my desktop on their network temporary.  I need to set up an ATA-188 and the telnet to is is disabled but I know the http is working.  they are 40 miles away so I cannot just "jump on" their PC and AnyDesk (etc) is also not an option.  I did this a few years ago but do not remember the necessary routes to add on each end.

My internal network is 192.168.69.x and I have a tunnel to their main office at 172.16.x.x and then there is another tunnel to their home on 172.20.x.x and finally, the home network that I need on is 192.168.200.x where the ATA-188 is.

From my desktop PC an my home I can ping my client's office Cisco router tunnel port at 172.16.1.3 but I cannot ping either side of the home Cisco 1921 router which is 172.20.0.1 office and 172.20.0.2 home.  I need to be able to get to 192.168.201.10 network on the far side of the client's home Cisco C1921 router from MY home PC which is 192.168.69.100 running Windows 10.

I have FULL access and admin rights to all three routers via the CLI.  I just need to know what route maps I need to add and on which router to put my PC onto their network.  

My PC  --- My Cisco 2901 ------ Clients Cisco 2951  ----- Clients Cisco 1921 --- Cisco ATA-188

My PC - 192.168.69.101
My 2901 - 192.168.69.1/172.16.0.1 255.255.0.0
Client 2951 - 192.168.200.1/172.16.1.3 255.255.0.0/172.20.0.1 255.255.255.248
Client 1921 - 192.168.201.1/172.20.0.1 255.255.255.248

Do I need to put my PC on the 192.168.201.x network or can I keep my IP address.  I think I would have to make too many changes to put mine on the 192.168.201.x network and it may cause other things to crash.

Thank you in advance.

[Flavio Miranda]

@Michael Durham 

 You need to check if Client 1921 have route to reply to 192.168.69.0. If not, you need to add.

ip route 192.168.69.0  255.255.255.0 172.20.0.1

With this route, the Client 1921 will return the traffic from your PC to Client 2951. As you can get to the Client 2951 already, you should be good.

 Mothing will be break with this route only.

[Michael Durham · Accepted solution]

I had to set ip route 172.20.0.0 255.255.255.248 172.16.1.3 on my Cisco 2901 router and ip route 192.168.69.0 255.255.255.0 172.16.0.1 on their Cisco 2951 router.  The client's C1921 router needed ip route 192.168.69.0 255.255.255.0 172.20.0.1 set on it and now everything works.   I can now reconfigure the client's Cisco ATA-188 from my home and its working!!