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Ping and Traceroute for DS-Lite

With Junos OS Release 11.4, you can use the ping and traceroute commands to determine the status of the DS-Lite softwire tunnels:

  • IPv6 ping—The softwire address endpoint on the DS-Lite softwire terminator (AFTR) is usually configured only at the [edit services softwire] hierarchy level; it need not be hosted on any interface. Previous releases of the Junos OS software did not provide replies to pings to the IPv6 softwire address when the AFTR was not configured on a specific interface or loopback. An IPv6 ping enables the softwire initiator (B4) to verify the softwire address of the AFTR before creating a tunnel.

  • IPv4 ping—A special IPv4 address,, is reserved for the AFTR. Previous releases of the Junos OS did not respond to any pings sent to this address. A B4 and other IPv4 nodes can now ping to this address to determine whether the DS-Lite tunnel is working.

  • Traceroute—The AFTR now generates and forwards traceroute packets over the DS-Lite tunnel.


No additional CLI configuration is necessary to use the new functionality.