Hi, there.

First, my details:

Host machine: Ubuntu Vivid Linux, 3.19.0-64-generic #72-Ubuntu SMP kernel
VirtualBox version: 5.1.2 r108956
Guest VM: Ubuntu Trusty, 3.19.0-43-generic #49~14.04.1-Ubuntu SMP kernel, 
Bridged networking

I believe that I have found an issue regarding SSH from another Linux computer 
into the guest VM. The ssh attempt will fail. tcpdump analysis captured 
truncated packets from the machine that was not able to SSH in. We tried the 
same test by installing an identical OS on a VMWare VM with bridged networking 
and the problem does not manifest itself. This suggests some form of MTU 
related issue, presumably involving the vboxnet* drivers on the host.

If I set the MTU for the guest interface from 1500 (the default) to 1501, I can 
ssh into the VM. I can ssh from my host machine into the guest without issue 
with the default MTU of 1500. This is most likely because it is using the lo 
interface.

I had Googled for a resolution to these symptoms without much success or 
agreement on a solution. So, I thought I would take the next step and post 
here. I imagine that many people are not using the VM's in this manner, hence 
why it might not have been detected.

Thanks in advance for any help. I appreciate this.

Rodney
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