vzctl 3.0.29 breaks networking

# uname -a
Linux foo 2.6.32-042stab037.1 #1 SMP Fri Sep 16 22:18:06 MSD 2011 x86_64 x86_64 x86_64 GNU/Linux

# rpm -qa |grep vzctl
vzctl-3.0.29-1.x86_64
vzctl-lib-3.0.29-1.x86_64
Note: tested with 3.0.29.1 also.

First issue:
Default behavior changed in adding ip addresses. Before 3.0.29 default behavior was to add ip addresses with a /32 subnetmask. Now the default behavior is to add ip addresses with a /24 subnetmask. This causes confusion and breaks the container from talking to another host in the same /24 netblock.
A major change in functionality like this should not be done in a point release but a major release.

Second issue:
Routes didn't use to show up for interfaces added. I don't know if this was a bug or a intentional but now they show up in the routing table.

Third and critical issue:
When added a host with a /32 netmask, everything appears fine but networking doesn't work.


Example for issue 1 and 2:
3.0.28.3:
# ifconfig venet0:0
venet0:0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:64.142.122.2 P-t-P:64.142.122.2 Bcast:64.142.122.2 Mask:255.255.255.255

# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 tunl0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 venet0
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 venet0

3.0.29 and 3.0.29.1:
venet0:0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:64.142.122.2 P-t-P:64.142.122.2 Bcast:64.142.122.255 Mask:255.255.255.0

# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
69.12.208.0 0.0.0.0 255.255.255.0 U 0 0 0 venet0
64.142.122.0 0.0.0.0 255.255.255.0 U 0 0 0 venet0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 tunl0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 venet0
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 venet0

Example for issue 3:
venet0:0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:64.142.122.2 P-t-P:64.142.122.2 Bcast:64.142.122.2 Mask:255.255.255.255
          UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1

# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 tunl0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 venet0
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 venet0

# traceroute -n 4.4.4.4
traceroute to 4.4.4.4 (4.4.4.4), 30 hops max, 60 byte packets
 1 * * *
 2 * * *
 3 * * *
 4 * * *

# tcpdump -i venet0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on venet0, link-type LINUX_SLL (Linux cooked), capture size 65535 bytes

^C^C