Hi, I don't know too much about lxc and networks.

I've got some questions to 
https://lists.linuxcontainers.org/pipermail/lxc-users/2015-February/008553.html
There is a host with a few public IPs.
sysctl.conf:
net.ipv4.ip_forward=1
net.ipv4.conf.eth0.proxy_arp=1

For every IP something like this:

/etc/network/interfaces.d/$IP
auto vc1
iface vc1 inet static
    address 172.16.0.1/32
    scope link
    pointopoint $IP
    post-down vcdown vc1
    post-up vcup vc1

vc2,and so on

vcdown and vcup do exit 0

The problem is that after lxc-stop and lxc-start sometimes there are errors 
like this:
lxc-start 20160403180712.290 ERROR    lxc_conf - conf.c:instantiate_veth:2677 - 
failed to create veth pair (vc1 and vethQJ3XAQ): File exists

How to speedup "closing" and "opening" vc1 and ensure that lxc-stop/lxc-start 
will succeed?
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