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# Configuring Tunnel Interfaces (SRC CLI)

You can configure tunnel interfaces to use the redirect server in deployments where a router running JUNOSe Software does not have a direct connection to the C Series Controller.

Before you configure a tunnel interface, configure the interface on the C Series Controller.

See Configuring Gigabit Ethernet Interfaces for IPv4 (SRC CLI)

Use the following configuration statements to configure tunnel interfaces at the [edit] hierarchy level:

`

interfaces name tunnel {
  mode (ipip | gre | sit);
  destination destination ;
  source source;
  key key ;
  interface interface ;
  ttl ttl ;
}
interfaces name unit unit-number family inet {
  address address ;
}

`

To configure a tunnel interface on a C Series Controller:

1. From configuration mode, access the configuration statement that configures tunnel interfaces.
   `
   [edit]
   user@host# edit interfaces name tunnel
   `

   For example:

   `
   [edit]
   user@host# edit interfaces ip-tunnel tunnel
   `

2. Configure the type of tunnel.
   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set mode ipip
   `

   or

   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set mode gre
   `

   or

   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set mode sit
   `
3. Specify the IP address of the remote end of the tunnel.
   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set destination destination
   `

   For example:

   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set destination 192.0.2.20
   `
4. (Optional) Specify an IP address that will not change for the local tunnel endpoint. It must be an address on another interface of this host.
   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set source source
   `

   For example:

   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set source 192.20.10.5
   `
5. (Optional) For a GRE tunnel, specify a key.
   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set key key
   `

   For example:

   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set key 250
   `
6. (Optional) Specify an existing physical interface on the C Series Controller.
   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set interface interface
   `

   For example:

   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set interface eth0
   `
7. (Optional) Specify the lifetime of tunneled packets.
   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set ttl ttl
   `

   For example:

   `
   [edit interfaces ip-tunnel tunnel]
   user@host# set ttl 110
   `
8. Verify the configuration by running the show command. For example:

       [edit interfaces]
       user@host# show

       unit 0 {
         family {
           inet6 {
             address 192.2.0.10/24;
           }
         }
       }
       ip-tunnel {
         tunnel {
             mode ipip;
             destination 192.0.2.20;
             source 192.20.10.5;
             interface eth0;
             ttl 110;
           }
       }

#### Related Topics

- Configuring Tunnel Interfaces (C-Web Interface)
- Configuring Gigabit Ethernet Interfaces for IPv6 (SRC CLI)
- Overview of External Interfaces on a C Series Controller

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