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Webcast-Catalyst9k
New Member

Connecting througca Tunnel

What needs to be done to clients to get them to talk across a tunnel.

Example

hostA--rtrA-------rtrB------rtrC----hostC

Tunnel1-------------------------------*

The tunnel is a simple GRE IP tunnel across 3 2500's.

What do I need to do to get HostA talking across the tunnel to hostC. Software?

5 REPLIES
New Member

Re: Connecting througca Tunnel

If the tunnel is configured and functional, hostA should be able to see hostC without any additional software.

Tunneling has the following three primary components:

Passenger protocol, which is the protocol that you are encapsulating (AppleTalk, Banyan VINES, CLNS, DECnet, IP, or IPX) That is what hostA is using to talk to hostC

Carrier protocol, which is one of many encapsulation protocols: Generic route encapsulation (GRE), in your case

Transport protocol, which is the protocol used to carry the encapsulated protocol (IP only) through your network.

So as soon as the tunnel interface is UP/UP at each end (rtrA and rtrC), the hosts should be able to talk.

best of luck !

New Member

Re: Connecting througca Tunnel

What does the ip of the host have to be? The subnet of E0 or the Tunnel?

New Member

Re: Connecting througca Tunnel

The host must have an address that is valid for the network it is connected to... ie E0

The host knows nothing of the tunnel. The router should route the traffic from hostA (rtrA E0 subnet) to hostC (rtrC E0 subnet) via the tunnel (only known to rtrA and rtrC).

New Member

Re: Connecting througca Tunnel

How would you test this?

New Member

Re: Connecting througca Tunnel

First test the tunnel... rtrA should be able to ping the far end of the tunnel (int tun x in rtrC).

Second test the local host ends... hostA should be able to ping its local gateway (rtrA E0) and hostB should be able to ping its local gateway (rtrC E0)

third check that your routers are routing OK.... show ip route on rtrA should be able to see subnet for rtrC E0 and rtrC should be able to see subnet for rtrA E0

fourth hostA should be able to ping hostC

best of luck

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