I'm experiencing the same behavior as LStranger.  My IP aliases are
coming up, but they're just not reflected  anywhere as online (in either
ifconfig or ip).

I can do the following and see the actual commands being run to bring up
the interfaces, which as far as I can tell are working correctly except
for the whole "showing the interfaces as up" thing.

root@server_name:~# ifdown -av && ifup -av
[ . . . ]
 ip route del default via xxx.yyy.100.1 metric 100 dev eth0 2>&1 1>/dev/null || 
true
ip -4 addr flush dev eth0
ip link set dev eth0 down
run-parts --verbose /etc/network/if-post-down.d
Configuring interface eth0:1=eth0:1 (inet)
run-parts --verbose /etc/network/if-down.d
run-parts: executing /etc/network/if-down.d/postfix
run-parts: executing /etc/network/if-down.d/upstart

ip -4 addr flush dev eth0:1
ip link set dev eth0:1 down
run-parts --verbose /etc/network/if-post-down.d

[ . . . ]
Configuring interface eth0=eth0 (inet)
iptables-restore < /etc/iptables.rules
run-parts --verbose /etc/network/if-pre-up.d
ip addr add xxx.yyy.100.11/255.255.255.0 broadcast xxx.yyy.100.255         dev 
eth0
ip link set dev eth0   up
 ip route add default via xxx.yyy.100.1 metric 100 dev eth0
[ . . . ]
Configuring interface eth0:1=eth0:1 (inet)
run-parts --verbose /etc/network/if-pre-up.d
ip addr add xxx.yyy.100.23/255.255.255.0          dev eth0:1
ip link set dev eth0:1   up
[ . . . ]

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https://bugs.launchpad.net/bugs/876829

Title:
  Oneiric's ifupdown breaks ip aliases

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