[net_server] DHCP doesn't work after interface deletion

[diver]

This is hrev39980, gcc4hybrid in VirtualBox 3.0.12 and 4.0.

After disabling/enabling network interface in Network preflet or deletion/creation it via ifconfig net_server doesn't obtain correct ip via DHCP anymore.

Default and working DHCP settings from VirtualBox:

~> ifconfig /dev/net/ipro1000/0
/dev/net/ipro1000/0
        Hardware type: Ethernet, Address: 08:00:27:c7:d8:5b
        Media type: 1 GBit, 1000BASE-T
        inet addr: 10.0.2.15, Bcast: 10.255.255.255, Mask: 255.255.255.0
        MTU: 1500, Metric: 0, up broadcast link auto-configured
        Receive: 4 packets, 0 errors, 1300 bytes, 0 mcasts, 0 dropped
        Transmit: 2 packets, 0 errors, 606 bytes, 0 mcasts, 0 dropped
        Collisions: 0

~> ifconfig del /dev/net/ipro1000/0 
~> ifconfig /dev/net/ipro1000/0 auto-config up
~> ifconfig /dev/net/ipro1000/0
/dev/net/ipro1000/0
        Hardware type: Ethernet, Address: 08:00:27:c7:d8:5b
        Media type: 1 GBit, 1000BASE-T
        inet addr: , Bcast: , Mask: 
        MTU: 1500, Metric: 0, up broadcast link
        Receive: 4 packets, 344 errors, 1300 bytes, 0 mcasts, 0 dropped
        Transmit: 2 packets, 0 errors, 606 bytes, 0 mcasts, 0 dropped
        Collisions: 0

After about 1 minute:

~> ifconfig /dev/net/ipro1000/0
        Hardware type: Ethernet, Address: 08:00:27:c7:d8:5b
        Media type: 1 GBit, 1000BASE-T
        inet addr: 169.254.0.107, Bcast: 169.254.255.255, Mask: 255.255.0.0
        MTU: 1500, Metric: 0, up broadcast link auto-configured
        Receive: 4 packets, 25670 errors, 1300 bytes, 0 mcasts, 0 dropped
        Transmit: 11 packets, 0 errors, 3279 bytes, 0 mcasts, 0 dropped
        Collisions: 0

syslog part:

KERN: [net/ipro1000/0] compat_close()
KERN: [net/ipro1000/0] compat_free()
KERN: [net/ipro1000/0] compat_open(0x2)
KERN: printf(`ifmedia_ioctl: switching %s to ',...)
KERN: printf(`Ethernet',...)
KERN: printf(` %s',...)
KERN: printf(`%s
KERN: ',...)
DAEMON 'DHCP': DHCP send message DHCP_DISCOVER for /dev/net/ipro1000/0
DAEMON 'DHCP': DHCP timeout shift for /dev/net/ipro1000/0: 4 secs (try 0)
DAEMON 'DHCP': DHCP send message DHCP_DISCOVER for /dev/net/ipro1000/0
DAEMON 'DHCP': DHCP timeout shift for /dev/net/ipro1000/0: 8 secs (try 0)
DAEMON 'DHCP': DHCP send message DHCP_DISCOVER for /dev/net/ipro1000/0
DAEMON 'DHCP': DHCP timeout shift for /dev/net/ipro1000/0: 2 secs (try 1)
DAEMON 'DHCP': DHCP send message DHCP_DISCOVER for /dev/net/ipro1000/0
DAEMON 'DHCP': DHCP timeout shift for /dev/net/ipro1000/0: 4 secs (try 1)
DAEMON 'DHCP': DHCP send message DHCP_DISCOVER for /dev/net/ipro1000/0
DAEMON 'DHCP': DHCP timeout shift for /dev/net/ipro1000/0: 8 secs (try 1)
DAEMON 'DHCP': DHCP send message DHCP_DISCOVER for /dev/net/ipro1000/0
DAEMON 'DHCP': DHCP timeout shift for /dev/net/ipro1000/0: 2 secs (try 2)
DAEMON 'DHCP': DHCP send message DHCP_DISCOVER for /dev/net/ipro1000/0
DAEMON 'DHCP': DHCP timeout shift for /dev/net/ipro1000/0: 4 secs (try 2)
DAEMON 'DHCP': DHCP send message DHCP_DISCOVER for /dev/net/ipro1000/0
DAEMON 'DHCP': DHCP timeout shift for /dev/net/ipro1000/0: 8 secs (try 2)
DAEMON 'DHCP': DHCP send message DHCP_DISCOVER for /dev/net/ipro1000/0
DAEMON 'DHCP': DHCP for /dev/net/ipro1000/0, status: Operation timed out