I've got a Debian + Xen server. After a system upgrade to the stable version the network doesn't come up after boot. Every time after reboot I need to bring it up manually. The network configuration was not changed during upgrade.

Here is /etc/network/interfaces:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
    address 11.22.33.44
    netmask 255.255.255.0
    gateway 11.22.33.1
    nameserver 8.8.8.8

After boot ip r shows no route and eth0 has no ip address. Manually ip and route setup goes fine and network starts working.

Messages from dmesg about network I've found (looks like nothing interesting)

[    3.894401] ACPI: Fan [FAN3] (off)
[    3.894444] ACPI: Fan [FAN4] (off)
[    4.178348] e1000e 0000:00:19.0: eth0: (PCI Express:2.5GT/s:Width x1) 00:1e:67:14:66:c9
[    4.178351] e1000e 0000:00:19.0: eth0: Intel(R) PRO/1000 Network Connection
[    4.178392] e1000e 0000:00:19.0: eth0: MAC: 10, PHY: 11, PBA No: 0100FF-0FF
[    4.178413] e1000e 0000:02:00.0: Disabling ASPM L0s L1
[    4.178432] xen: registering gsi 16 triggering 0 polarity 1
--
[    4.223667] ata5: DUMMY
[    4.223668] ata6: DUMMY
[    4.289153] e1000e 0000:02:00.0: eth1: (PCI Express:2.5GT/s:Width x1) 00:1e:67:14:66:c8
[    4.289155] e1000e 0000:02:00.0: eth1: Intel(R) PRO/1000 Network Connection
[    4.289245] e1000e 0000:02:00.0: eth1: MAC: 3, PHY: 8, PBA No: 1000FF-0FF
[    4.506908] usb 1-1: new high-speed USB device number 2 using ehci_hcd
[    4.542920] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
--
[   10.362999] EXT4-fs (dm-23): mounted filesystem with ordered data mode. Opts: (null)
[   10.419103] EXT4-fs (dm-3): mounted filesystem with ordered data mode. Opts: (null)
[   10.988255] ADDRCONF(NETDEV_UP): eth1: link is not ready
[   13.175533] Event-channel device installed.
[   13.287555] XENBUS: Unable to read cpu state
--
[   13.288670] XENBUS: Unable to read cpu state
[   13.965939] Bridge firewalling registered
[   14.134048] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[   14.283862] ADDRCONF(NETDEV_UP): peth0: link is not ready
[   14.284543] ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[   17.800627] e1000e: peth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[   17.801377] ADDRCONF(NETDEV_CHANGE): peth0: link becomes ready
[   18.307278] device peth0 entered promiscuous mode
[   24.538899] eth1: no IPv6 routers present
[   28.570902] peth0: no IPv6 routers present

I've upgraded two servers and I've such behaviour on two of them. How to fix this and get network starts automatically on boot?