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Date:      Sat, 4 Jun 2016 13:50:46 -0600
From:      Alan Somers <asomers@freebsd.org>
To:        Don Lewis <truckman@freebsd.org>
Cc:        FreeBSD CURRENT <freebsd-current@freebsd.org>, freebsd-emulation@freebsd.org
Subject:   Re: VirtualBox network connectivity broken on recent -CURRENT
Message-ID:  <CAOtMX2hX3sLuubASTuq2bbyNn3wrM=j6p4nfr0gebLpn3_mcdw@mail.gmail.com>
In-Reply-To: <201606040043.u540hOVq045060@gw.catspoiler.org>
References:  <201606040011.u540BODD045000@gw.catspoiler.org> <201606040043.u540hOVq045060@gw.catspoiler.org>

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On Fri, Jun 3, 2016 at 6:43 PM, Don Lewis <truckman@freebsd.org> wrote:
> On  3 Jun, Don Lewis wrote:
>> It looks like something changed in -CURRENT to break network
>> connectivity to VirtualBox guests.  This was last known to work with
>> r299139 (May 6th) and is definitely broken with r301229.  The VirtualBox
>> port revisions are:
>>       virtualbox-ose-4.3.38_1
>>       virtualbox-ose-kmod-4.3.38
>> It looks like there was one change to the VirtualBox on May 9th, but it
>> looks unlikely to be the cause of the problem.
>>
>> The network settings are:
>>       Attached to: Bridged Adapter
>>       Name: re0
>>       Adapter Type: Paravirtualized Network (virtio-net)
>>       Promiscuous Mode: Deny
>>       MAC Address: [snip]
>> Ifconfig says that the interface is up, but I am unable to ping either
>> the host or anything else on the LAN from the guest.  It looks like the
>> problem is with outbound traffic.  If I attempt to ping the guest, the
>> source IP address and MAC address show up in the guest's arp table, but
>> ping reports:
>>       ping: sendto: Host is down
>> That makes me think that the arp responses from the guest are not
>> getting transmitted.  None of the machines involved are running
>> firewalls.  If I ping from the guest, I don't see any arp requests on
>> the wire and the arp command shows the table entry as incomplete.
>>
>> The problem shows up with both FreeBSD -CURRENT and Debian guests.
>
> I see the same behaviour if I set:
>         Attached to: NAT
> or
>         Adapter Type: 82540EM
>

Might be related to this routing bug:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207831



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