two tunnels and one site¿??

i don´t understand because i establish two tunnels for go to one site..

i have this configuration:

192.168.2.0 --x.y.z.cx.c.v.b--192.168.1.0
192.168.2.0--x.y.z.c x.c.v.b--10.0.0.0


In others sistems (fortinet) i only stablish one tunnel and add two routes over vpn :

192.168.2.0--x.y.z.c x.c.v.b--192.168.1.0
                         |
                         |Packet Filter Rule:
                         | 
                         | From: Internal_network
                         | To:     10.0.0.0 
                         | Acction: Encript---(NAME-TUNEL)-> VPNasl1
                         |__________ x.c.v.b--10.0.0.2


Perdon for my bad english, but i know what this is very interesting.

Many systems only can stablish one tunnel with the some IP.

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