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Created February 1, 2012 10:49
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VirtualBox NAT interface stops responding under load
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README.md

VirtualBox NAT bug

Pushing a certain quantity/mixture of data through a VB guest's NAT interface causes all TCP/UDP connections to fail for a period of time thereafter.

The only way I've been able to reliably reproduce this is to use pip(1) to download a large list of Python packages. After a number of packages have been downloaded (14~20) pip will exit with an HTTP or DNS timeout. Inbound port-forwarded SSH connections will drop with:

Connection to 127.0.0.1 closed by remote host.

This appears most likely to occur with the Intel PRO/1000 MT Desktop (82540EM) NIC. It is harder to reproduce with PCnet-FAST III (Am79C973) NICs. It is not reproducible with host-only or bridged adapters.

Tested against VirtualBox version:

dan@dan-MacPro:~$ VBoxManage -v
4.1.8r75467
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curl_loop.txt
[vagrant@cent6 ~]$ set -o pipefail; while true; do curl -sI --connect-timeout 1 --max-time 1 http://10.0.2.2/~dan/ | grep Date; [ $? == 0 ] || echo fail; sleep 1; done
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^C
[vagrant@cent6 ~]$
Raw
pip_install.txt
[vagrant@cent6 ~]$ time python-pip install -v -d down -r requirements.txt; date
...
Using version 1.2.1 (newest of versions: 1.2.1, 1.2.1)
Downloading Django-1.2.1.tar.gz (6.2Mb): 6.2Mb downloaded
Saved ./down/Django-1.2.1.tar.gz
Downloading/unpacking django-extensions==0.6 (from -r req.txt (line 6))
Could not fetch URL http://pypi.python.org/simple/django-extensions: <urlopen error [Errno -2] Name or service not known>
Will skip URL http://pypi.python.org/simple/django-extensions when looking for download links for django-extensions==0.6 (from -r req.txt (line 6))
Real name of requirement django-extensions is django-extensions
Could not fetch URL http://pypi.python.org/simple/django-extensions/0.6: <urlopen error [Errno -2] Name or service not known>
Will skip URL http://pypi.python.org/simple/django-extensions/0.6 when looking for download links for django-extensions==0.6 (from -r req.txt (line 6))
Could not fetch URL http://pypi.python.org/simple/django-extensions/: <urlopen error [Errno -2] Name or service not known>
Will skip URL http://pypi.python.org/simple/django-extensions/ when looking for
download links for django-extensions==0.6 (from -r req.txt (line 6))
Could not fetch URL http://dist.pinaxproject.com/dev/django-extensions/: <urlopen error [Errno -2] Name or service not known>
Will skip URL http://dist.pinaxproject.com/dev/django-extensions/ when looking for download links for django-extensions==0.6 (from -r req.txt (line 6))
Could not find any downloads that satisfy the requirement django-extensions==0.6 (from -r req.txt (line 6))
No distributions at all found for django-extensions==0.6 (from -r req.txt (line 6))
Exception information:
Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/pip/basecommand.py", line 124, in main
self.run(options, args)
File "/usr/lib/python2.6/site-packages/pip/commands/install.py", line 178, in run
requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
File "/usr/lib/python2.6/site-packages/pip/req.py", line 896, in prepare_files
url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
File "/usr/lib/python2.6/site-packages/pip/index.py", line 141, in find_requirement
raise DistributionNotFound('No distributions at all found for %s' % req)
DistributionNotFound: No distributions at all found for django-extensions==0.6 (from -r req.txt (line 6))
Storing complete log in /home/vagrant/.pip/pip.log
real 1m52.367s
user 0m4.801s
sys 0m1.907s
Wed Feb 1 12:59:36 GMT 2012
[vagrant@cent6 ~]$
Raw
requirements.txt
unittest-xml-reporting==1.0.3
httplib2==0.7.1
BeautifulSoup==3.2.0
raven==1.1.1
amqplib==0.6.1
django-extensions==0.6
south==0.7.3
GChartWrapper==0.9
celery==2.2.6
django-celery==2.2.4
django-rosetta==0.6.0
webassets==0.5
cssmin==0.1.4
python-memcached==1.47
--extra-index-url=http://dist.pinaxproject.com/dev/
Django==1.2.1
Pinax==0.9a1
django-debug-toolbar==0.8.3
django-staticfiles==0.2.0
django-mailer==0.2a1.dev1
django-email-confirmation==0.2.dev2
django-timezones==0.2.dev1
django-ajax-validation==0.1.3
pytz==2010h
django-openid==0.2.3.dev1
python-openid==2.2.5
django-uni-form==0.7.0
django-announcements==0.1.2
django-pagination==1.0.7
django-notification==0.1.4
python-dateutil==1.4.1
docutils==0.6
gdata==1.3.3
Pygments==1.3.1
python-twitter==0.5
simplejson==2.0.9
textile==2.1.4
vobject==0.8.1c
ybrowserauth==1.2
Markdown==2.0.3
diff-match-patch==20090804
geopy==0.94
creole==1.1
django-atomformat==0.1.1.dev1
django-avatar==1.0.4
django-bookmarks==0.1.0
django-flag==0.2.dev9
django-friends==0.1.5
django-locations==0.1.1
django-messages==0.4.2
django-microblogging==0.2.dev1
django-oembed==0.1.1
django-swaps==0.5.3
django-sorting>=0.1
django-tagging==0.3.1
django-threadedcomments==0.5.2
django-voting==0.1
django-wakawaka==0.4.dev5
django-photologue==2.3
django-attachments==0.3.1
django-markup==0.4
django-groups==0.1.dev10
django-tagging-ext==0.2.0
@cowholio4
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Did you ever find a solution to this?

@dcarley
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dcarley commented Aug 4, 2012

There are some workarounds. More info here: hashicorp/vagrant#516

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