Bridged network: packages shown only from guest to host

[Adrienn]

I'm using VirtualBox 4.0.2 (r69518) on Ubuntu Lucid (64bit, kernel: 2.6.32-27-generic) host. The guest is an Ubuntu based os. (64bit, kernel: 2.6.22), has one network adapter, which is bridged (PCnet-FAST III). The eth0 interface on host is in promiscuous mode.

When I send 'ping' from host to guest or from guest to host, on the host tcpdump shows only the incoming packets, although on guest it shows packages in both directions.

I've read a similar problem in bug #8076, and applied the patch to file VBoxNetFlt-linux.c, but the patch did not correct the problem, moreover now on the guest os too: tcpdump does not show packages from guest to host.

Using VirtualBox 3.2.12 (r68302) this problem not exists, packages from both directions are shown.

[Aleksey Ilyushin]

What about the pings? Are they successful? Please attach the patched VBoxNetFlt-linux.c to the ticket. Please also enable internal capture feature for VM with

VBoxManage modifyvm <vmname> --nictrace1 on --nictracefile1 <name_of_your_choice>

and check whether both ICMP requests and replies are present in the capture file.

[Adrienn]

Test1 - ping on host

[Adrienn]

Test1 - tcpdump on host

[Adrienn]

Test1 - tcpdump on guest

[Adrienn]

Test1:

• host and guest configuration the same as above
  
• unpatched VirtualBox 4.0.2 (r69518)
  
• ping is successful

[Adrienn]

Hm ... I've applied the patch and it works: ICMP request and reply messages are shown on host and guest too. I don't know, why it didn't work yesterday. Sorry, for the false alarm.

[Adrienn]

The patched VBoxNetFlt-linux.c