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configuring ipsec with gre

ar flag

I am setting up gre over isec and I have a cisco configuration. I am trying to move this cisco configuration to ubuntu and do not understand how the tunnel is setup

interface local
 ip address x1 

interface tun 
 ip address x2 
 ip pim sparse-mode
 tunnel source x1
 tunnel destination x4


interface fa0/0
ip address x8
ip pim sparse-mode

interface fa0/1
ip address publicip 


ip route x6 255.255.255.0 
ip route x7 255.255.255.255 tun 
ip route x4 255.255.255.255
ip classless
ip pim rp-address x7
ip mroute x6 255.255.255.128 tun

Could someone explain how the tunnel is operating ? I see the tun interface having an ip x2 with source x1 and x4. How is data sent to x1 or x4 ?

mangohost

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