# IPv6 to IPv4 Tunnel Interface Configuration Mode Commands

The IPv6 to IPv4 Tunnel Interface Configuration Mode is used to create and manage the IP interfaces for addresses, address resolution options, etc.

IMPORTANT:

The commands or keywords/variables that are available are dependent on platform type, product version, and installed license(s).
destination address

Configures the destination of the tunnelled packets for a manual tunnel.
Platform:

ASR 5000
Product:

All
Privilege:

Administrator
Syntax

destination address address

no destination address
no

Removes configuration for the specified keyword.
address

Specifies the IP address of the destination device. address must be specified in IPv4 dotted decimal or IPv6 colon-separated-hexadecimal notation.
Usage:

Use this command to configure the IP address of the destination end of the tunnel.
Example:
The following command sets the destination address for packets on this tunnelled interface to 10.2.3.4:

    destination address 10.2.3.4

end

Exits the current configuration mode and returns to the Exec mode.
Product:

All
Privilege:

Security Administrator, Administrator
Syntax

    end

Usage:

Use this command to return to the Exec mode.
exit

Exits the current mode and returns to the parent configuration mode.
Product:

All
Privilege:

Security Administrator, Administrator
Syntax

    exit

Usage:

Use this command to return to the parent configuration mode.
mode

Configures the mode of IPv6 to IPv4 tunneling. The default is set to manual mode.
Platform:

ASR 5000
Product:

All
Privilege:

Security Administrator, Administrator
Syntax

mode { 6to4 | manual }

default mode
6to4

Configures automatic IPv6-to-IPv4 (6to4 ) tunnels as specified in RFC 3056.
manual

Configures point-to-point manual IPv6-to-IPv4 tunnels by specifying the IPv4 address of the tunnel remote end.
default

Resets the mode of IPv6-to-IPv4 tunneling to manual mode.
Usage:

There can be only one IPv6-to-IPv4 tunnel possible in a context. Once an IPv6-to-IPv4 tunnel is configured, all subsequent tunnels will be configured as manual tunnels.
Example:
The following command configures the mode to IPv6-to-IPv4 (6to4).

    mode 6to4

The following command configures the mode to 6to4.

    mode manual

source

Configures the source of tunneled packets.
Platform:

ASR 5000
Product:

PDSN, HA
Privilege:

Security Administrator, Administrator
Syntax

    source { address ip_address | interface
    interface_name
    }no source { address | interface }

address ip_address

Specifies the IPv4 address to use as the source address of the tunnel.

ip_address must be expressed in IPv4 dotted-decimal notation.
interface interface_name

Specifies the name of a non-tunnel IPv4 interface, whose address is used as the source address of the tunnel. interface must be an alphanumeric string of 1 through 79 characters.
no source { address | interface }

Removes configuration for the specified keyword.
Usage:

Configures the source IPv4 address of the tunnel by either specifying the IP address (host address) or by specifying another configured non-tunnel IPv4 interface. The source address must be an existing interface address before it is used. State of source address will affect the operational state of the tunnel.
Example:
The following command configures the source address of the tunnel.

    source address 10.2.3.4

The following command specifies the source interface as testsource1.

    source interface testsource1

tos

Configures the type of service (TOS) settings of the outer IPv4 header of the tunneled packets.
Platform:

ASR 5000
Product:

PDSN, HA
Privilege:

Security Administrator, Administrator
Syntax

    tos { copy | value tos_value }default tos

copy

Copies the DC octet of the IPv6 packet to the TOS octet of IPv4 packet.
default

Configures default setting for the specified keyword.
value tos_value

Configures the raw TOS value ranging from 0 to 255. The default is 0.
Usage:

Sets the TOS parameter to be used in the tunnel transport protocol or copies the TOS value from the original IPv6 DC byte to the TOS value of the encapsulating IPv4 header.
Example:
The following command sets the tos value to 1:

    tos value 1

ttl

Configures the TTL (Time to live) value of the outer IPv4 header of the tunneled packets.
Platform:

ASR 5000
Product:

PDSN, HA
Privilege:

Security Administrator, Administrator
Syntax

    ttl value ttl_value

default

Configures default setting for the specified keyword.
value ttl_value

ttl_value is an integer from 1 through 255. The default is 16.
Usage:

Configures the TTL parameter to be used in the tunnel transport protocol.
Example:
The following command sets the TTL value to 25.

    ttl value 25