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Ticket Resolution Summary Owner Reporter
#13156 fixed 'NAT Network' cannot send big files Matthijs Melchior
Description

It seems 'NAT network' does not implement flow control.

From the attached network trace files one can observe that when flow control is needed, the 'NAT Network' adapter stops working and sends a RST to both ends of the tcp connection.

My setup for demonstrating the problem is as follows:

Laptop with Win7 and VBox 4.3.12 Win7=192.168,178.34
Linux machine with open port 9 (discard), Linux=192.168.178.25
GBit switch between Laptop and Linux
Ubuntu 14.04 running in a VBox on the Laptop, eth0=192.168.178.38, eth1=10.0.3.4
Network interface 2 is set to 'NAT Network' with paravirtualized driver.
On Ubuntu, Linux is routed through the 'NAT Network' interface:

# ip route add 192.168.178.25 via 10.0.2.1 dev eth1 scope link src 10.0.2.4

Wireshark running on both ends of the connection, in VBox Ubuntu and on Linux,
both selecting only packets for port 9

Then the following command will show the problem in the 2 traces:

$ dd if=/dev/zero bs=9820 count=1 | nc 192.168.178.25 9

This will mostly fail,
a smaller number of bytes will always succeed ( < 9800),
and a greater number of bytes will always fail ( > 9900).

Using another adapter type does not make a difference.
Not offloading tcp segmentation does not make a difference.
There are no messages in the VBox log file at the time this happens.

The 2 .pcapng files contain the network traces of the following commands:

$ dd if=/dev/zero bs=9820 count=1 | nc 192.168.178.25 9 && echo OK
1+0 records in
1+0 records out
9820 bytes (9,8 kB) copied, 0,000322761 s, 30,4 MB/s
OK
$ dd if=/dev/zero bs=9800 count=1 | nc 192.168.178.25 9 && echo OK
1+0 records in
1+0 records out
9800 bytes (9,8 kB) copied, 0,000111585 s, 87,8 MB/s
OK
$ dd if=/dev/zero bs=9900 count=1 | nc 192.168.178.25 9 && echo OK
1+0 records in
1+0 records out
9900 bytes (9,9 kB) copied, 0,031919 s, 310 kB/s
OK
$ dd if=/dev/zero bs=99000 count=1 | nc 192.168.178.25 9 && echo OK
1+0 records in
1+0 records out
99000 bytes (99 kB) copied, 0,0124187 s, 8,0 MB/s
OK
$ 

Only the second command does not end with RST message in the .pcapng file.

Of course, the workaround for this problem is to use the good old 'NAT' adapter...

#20368 invalid 'Oracele Virtualbox Manager' is appearing on every separate Desktop EttD
Description

A strange thing is that when I open Virtualbox, that the 'Oracele Virtualbox Manager' is appearing on every separate Desktop of my MacBook Pro.

That was not the case before...

Thank you for looking at this matter

Gr Ett

#17748 worksforme 'Save State' shortcut key doesn't work kujulutu
Description

I wanted to be able to quickly close the guest window, so I created a shortcut key to do a 'Save State'. It didn't work. To to what I did, which is very easy, on the main VirtualBox window, go to File > Preferences > Input, then on the right side select the Virtual Machine tab and scroll down to the entry 'Save State'. By default it's blank. Enter a new combination, such as Host key + B (this one isn't already used up). Now launch any VM and press Host + B. It should do a 'Save State', it does nothing for me.

I've tested assigning Host + B to other functions, such as the 'About VirtualBox...' entry, and it works, when I press Host + B the About window pops up, so that's not the problem.

I've tested assigning Host + other key combos, doesn't work.

I've tested assigning Host + B to 'Save State' on the VirtualBox Manager tab (instead of the Virtual Machine tab as explained above). Then I launched a VM, went back to the VirtualBox main window (Oracle VM VirtualBox Manager) and pressed Host + B, it worked perfectly. It should be clarified that in the case of the VirtualBox Manager tab the default entry for 'Save State' is Host + V, which also works perfectly.

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