5.5.5.5 6.6.6.6
e0 IP cloud e0
R1---------R2-R3-R4-R5-R6--------R7
t0 t0
1.1.1.1 1.1.1.2
Lets say that you have two routers (R1&R7) each with a tunnel interface.
Also there are about 5 routers in between them(R2-R6). The 5 routers in the
middle will only know the How to reach the E0 interfaces (or ip addresses),
NOT the tunnel interface (or tunnel ip address). Anytime you send a packet
destined for a tunnel interface, the source/destination addressess will be
the ip address of the E0 interfaces. The tunnel information is seen as data
to the outgoing/incoming IP packet. If sending from R1 to R7, R1 will use
the source address of E0 then add the tunnel info as the payload. When R7
sees the data in the packet he will see a GRE header which tells him that
there is tunnel information which follows. R7 will strip off the GRE header
then see the source ip address of the tunnell interface on R1.
The only traffic that will be tunneled will be traffic that has a next hop
of the tunnel interface
wrote in message
news:[EMAIL PROTECTED]...
> I am kinda confused on the details of how tunneling
> works...
>
> questions:
>
> 1> what will the source and destination ip addresses
> of the gre encapsulated packets be? (posible answers
> include the address of the tunnels, or the e0
> interfaces, etc...)
>
> 2>what traffic will be tunneled? (all traffic inbound
> to e0, or all traffic detined to the local tunnel
> interface?)
>
> hope that makes sense
>
> r1:
> interface Tunnel0
> ip address 192.168.20.1 255.255.255.0
> tunnel source Ethernet0
> tunnel destination 11.11.11.11
> r2:
> interface Tunnel0
> ip address 192.168.20.2 255.255.255.0
> tunnel source Ethernet0
> tunnel destination 9.9.9.9
>
>
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