[vbox-dev] Odd networking issue with VirtuaBox

Aleksey Ilyushin aleksey.ilyushin at oracle.com
Tue Jun 16 16:07:39 GMT 2015

Hi Maarten,

On 16 Jun 2015, at 16:33, Maarten Hoes <hoes.maarten at gmail.com> wrote:

> Hi,
> Im experiencing an odd networking issue with VirtuaBox 4.3.28 on an Windows 8.1 host, and a CentOS 7 linux guest.
> When I set my networking to 'bridged adapter', (some) outgoing traffic seems to malfunction. For example, a simple command like 'wget http:/www.google.com' just seems to 'hang'. (ping/icmp does work though). But soon as I switch the network to 'NAT' (and restart the vm), the wget command succeeds and retrieves the web page as expected. Setting the network to 'NAT' has an  issue of it's own though, as I seem to be unable to ssh into the vm. Im not sure if these issues are related or if they are seperate.
> So since switching networking to and from 'bridged adapter' and 'NAT' introduces the behaviour, and no other changes to the vm is made, makes me wonder if I might be running into a VirtuaBox bug. I have no idea on how to start troubleshooting the issue, though.
Please start by disabling both checksum and segmentation offloading in the guest (‘ethtool -K’ is the way to go).
> Does VirtuaBox have a way to produce a debug log or something that I could post somewhere (like on this list or in a bug report) that would be useful ? 
Enabling the packet tracing feature may shed some light on the issue. Here is how to do it: https://www.virtualbox.org/wiki/Network_tips
> - Maarten
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