My situation is as follows:
pc1 88.137.199.30/24 through router1----> (to master router)
pc2 88.137.199.178/24 through router2----> (to master router)
(from clients) ---> Master Router gw 88.137.199.1 loopback----ether0======>INTERNET
Nota:
I'm thinking if you can use ipsec to connect the routers arranged in tunnel mode.
But I don't know how to do

Can you give me any idea?
Thank very much!
MarK