[vbox 4.0.8] Cannot setup bridged networking

[Sergey Vinogradov]

Hi list,
I'm trying to set up a vbox 4.0.8 headless instance on my server, and I 
have a problem with the bridged networking.

System configuration, briefly: the bridged interface on the host system 
for guest's NIC 1 is nfe0.3851, and has alias 192.168.13.1/24. The guest 
system is Ubuntu server 11.04 amd64, NIC1 is eth0, and has IP 
192.168.13.7/24.

When I'm trying to ping 192.168.13.1 from guest OS, I get nothing but 
"Destination host unreachable" errors. Looking through tcpdumps on both 
guest and host systems brings up the following: host replies to arp 
who-has packets, emitted by guest, but guest doesn't receive any replies.

Am I missing something obvious?

P.S. Some additional info:

odin% uname -a
FreeBSD odin.lazybytes.org 8.2-RELEASE-p1 FreeBSD 8.2-RELEASE-p1 #0: Wed 
Apr 27 13:59:52 MSD 2011 
boogie at odin.lazybytes.org:/usr/obj/usr/src/8.2/sys/KERNLITE-AMD64-SMP-IPV6 
  amd64

odin% sudo -u vboxusers VBoxManage showvminfo caprice | grep 'NIC 1'
NIC 1:           MAC: 08002710E893, Attachment: Bridged Interface 
'nfe0.3851', Cable connected: on, Trace: off (file: none), Type: 
82540EM, Reported speed: 0 Mbps, Boot priority: 0

odin% kldstat
Id Refs Address            Size     Name
  1   43 0xffffffff80100000 7345a8   kernel
  2    1 0xffffffff80835000 1ad208   zfs.ko
  3    2 0xffffffff809e3000 3a08     opensolaris.ko
  4    1 0xffffffff809e7000 21008    geom_mirror.ko
  5    1 0xffffffff80a09000 1cd98    ipfw.ko
  6    2 0xffffffff80a26000 14160    libalias.ko
  7    1 0xffffffff80a3b000 4d068    pf.ko
  8    1 0xffffffff80a89000 15cf0    if_msk.ko
  9    1 0xffffffff80a9f000 fe80     if_nfe.ko
10    1 0xffffffff80aaf000 2778     amdtemp.ko
14    2 0xffffffff80c4b000 8d2c     netgraph.ko
15    1 0xffffffff80c54000 151a     ng_ether.ko
20    3 0xffffffff80c56000 29e86    vboxdrv.ko
21    2 0xffffffff80c22000 290e     vboxnetflt.ko
22    1 0xffffffff80c25000 e5c      vboxnetadp.ko

-- 
wbr,
Boo