Public bug reported:

lsb_release -rd
Description:    Ubuntu 14.04.4 LTS
Release:        14.04

apt-cache policy ifupdown
ifupdown:
  Installed: 0.7.47.2ubuntu4.4
  Candidate: 0.7.47.2ubuntu4.4


ifupdown of ucarp interface fails if the interface name >=16 chars.

Example configuration,

bond0.1234:ucarp

/usr/share/ucarp/vip-up bond0.1234 10.10.20.2

RTNETLINK answers: Numerical result out of range
Failed to bring up bond0.1234:ucarp.

To work around this issue,
1) Rename the bond0.1234:ucarp interface manually in /etc/network/interfaces 
file to bond0.1234:u
2) Edit /usr/share/ucarp/vip-up and /usr/share/ucarp/vip-down script
to use the modified interface name.

/sbin/ifup $1:u


This issue affects all ucarp interfaces on vlans > 999.

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1589775

Title:
  ifupdown of ucarp interface fails

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