[vbox-dev] Possible bug in Virtualbox 5.0.4 r 102546 - Guest can´t ping virtualbox host

[Klaus Espenlaub]

Luis,

On 21.09.2015 12:10, pcexper at gmail.com wrote:
> Hi,
> I have tested this problems in 3 diferent´s computers (2 with windows 10
> a 1 one with windows 8.1 and the result was the same). I installed
> virtualbox and guest additions and make a virtual machine with windows
> XP. Inside the guest machine, i ping to the host computer and i cannot
> find the host (i find all others computers in network and i tested to
> ping from another computer´s to this host machine and it find it). I
> tried to find a solution in the forums with no sucess and make many
> others diferent´s test to see if i can a solution. And, indeed, i find a
> solution but, to me, it seems like a bug... i start the virtualbox and
> the guest machine (windows xp) and then, go to the ethernet
> configuration of the host machine (where is the IP adress, ...) and
> change something in there (for example, "Clients for Microsoft Network"
> and put it back again) and click in OK. when i go to the guest machine
> and ping to the host IT WORK´S.
> Can you see this situation ?

Yes, currently there's a bug in VirtualBox (you forgot the keyword 
"bridged" in the above description) related to network offloading 
(checksumming, segmentation) which leads to corrupted packets when 
echanging data between host and guest (but not with other systems on the 
LAN). What you posted is a workaround which kicks things into the proper 
state.

We're on it already, but it's a non-trivial issue.

Klaus

> Best Regard´s,
>   Luis Ventura