netdev - ip l2tp - suspected defect using IPv6 local/remote addresses

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Date:	Wed, 11 Sep 2013 14:52:11 -0400
From:	Jeff Loughridge <jeffl@...mni.duke.edu>
To:	netdev@...r.kernel.org
Subject: ip l2tp - suspected defect using IPv6 local/remote addresses

Using IPv6 address as L2TPv3 endpoints doesn't seem to work in
iproute2 3.11. I see a cosmetic defect in the output of 'ip l2tp show
tunnel'. In addition, I can't get tunnels to function with UDP or IP
encapsulation.

root@...ian:~# ip l2tp add tunnel tunnel_id 3000 peer_tunnel_id 4000
encap udp local a::1 remote a::2 udp_sport 5000 udp_dport 6000
root@...ian:~# ip l2tp add session tunnel_id 3000 session_id 1000
peer_session_id 2000
root@...ian:~# ip l2tp show tunnel
Tunnel 3000, encap UDP
  From 127.0.0.1 to 127.0.0.1
  Peer tunnel 4000
  UDP source / dest ports: 5000/6000
root@...ian:~#

See below for more details about my set-up. I have no problems using
IPv4 endpoints.

root@...ian:~# ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UNKNOWN group default qlen 1000
    link/ether 00:0c:29:91:cb:3c brd ff:ff:ff:ff:ff:ff
    inet 5.1.0.100/24 scope global eth0
    inet6 a::1/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe91:cb3c/64 scope link
       valid_lft forever preferred_lft forever
root@...ian:~#
root@...ian:~# ip -V
ip utility, iproute2-ss130903
root@...ian:~# uname -a
Linux debian 3.2.0-4-686-pae #1 SMP Debian 3.2.41-2 i686 GNU/Linux
root@...ian:~#
root@...ian:~# modprobe l2tp_eth
root@...ian:~# lsmod | grep l2tp
l2tp_eth               12738  0
l2tp_netlink           17263  1 l2tp_eth
l2tp_core              17486  2 l2tp_netlink,l2tp_eth

Jeff L.
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