Netmask reset at boot

Hi *,
it's some time now (I can't say how long) that I have a "little" problem on my Debian (it's an unstable box). What happens is that at every boot the netmask of my eth0 is reset, so I can't connect.

This is /etc/network/interfaces:

---8<---
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static

        gateway 192.168.1.1
        metric  1
        address 192.168.1.36
        netmask 255.255.255.0
        broadcast 192.168.1.255

Here's what appears when the computer has just booted:

# ifconfig eth0

eth0      Link encap:Ethernet  HWaddr 00:DE:AD:DE:AD:00  
          inet addr:192.168.1.36  Bcast:192.168.1.255  Mask:255.255.255.255
          inet6 addr: fe80::211:d8ff:fec8:e1eb/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          ...
#
          

I can connect only if I set the correct netmask and I fix the routing table:

# ifconfig eth0 netmask 255.255.255.0
# route add default gw 192.168.1.1

Do you need help?

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I've already grep'ed for ifconfig into /etc/, also looked for eth0 into /etc/udev/, bot I haven't noticed anything strange.

Any idea about this?

Kindly,
David (a newcomer to debian-user :) )

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